Australian Cameron Smith holds a one-stroke lead after the opening day of the PGA Tour's calendar year-opening Tournament of Champions in Hawaii on Thursday.

Smith carded an eight-under-par 65 which included two eagles along with five birdies and one bogey to claim the lead ahead of three players including world number one Jon Rahm on seven under.

Rahm is tied with American pair Daniel Berger and Patrick Cantlay following rounds of 66 in good conditions.

More than half of the 38-player field broke 70 in the conditions, although Grand Slam winners Phil Mickelson, Jordan Spieth (both 71) and Justin Thomas (74) were not among that group.

Top-ranked Rahm and PGA Tour Player of the Year Cantlay were both returning to competitive golf after several months off and made fine transitions.

The Spaniard had seven birdies and no bogeys in his round, while Cantlay started with a bogey but finished in style, with four birdies and an eagle in his final five holes.

Berger might have shared the lead with Smith if not for a bogey on the penultimate hole, having made five birdies on his front nine.

Erik van Rooyen, Kevin Na and Sungjae Jim are six under, while world number two Collin Morikawa and four-time major winner Brooks Koepka are among five players at five under.

Top 20 trio Bryson DeChambeau, Xander Schauffele and Hideki Matsuyama are also not far off the pace after opening rounds of four-under for 69.

Crowds came flocking back in force, we had the full complement of golf majors and tennis grand slams, and sport almost ran smoothly over the past 12 months.

To boot, there were sensational moments, featuring both the biggest names in sport and some that few had heard of at this time last year.

Here, Stats Perform looks back at some of the biggest stories of the year, and the numbers that made them so remarkable.

Jacobs, the shock Tokyo Olympics sprint king

Entering 2021, Italy's Lamont Marcell Jacobs had a career-best of 10.03 seconds for the 100 metres. By most standards that is staggeringly quick, but at the very elite level of sprinting it ranks as only middling. To put it into some context, 34 men ran quicker than 10.03 seconds in 2021. Jacobs finished only 19th at the 2019 World Championship and few outside of athletics circles knew the name. The former long-jumper grabbed a little attention when he produced a world-leading 6.47 seconds to win the 60 metres at the European Indoor Championships in March, then he ran 9.95 for the 100m in Savona in May, but he still headed to the Tokyo Olympics as a big outsider, not expected to be a factor. Jacobs made a mockery of his lowly billing, as he powered to personal bests in the heats and semi-finals before doing so again in the final, dashing home first in 9.80 seconds to grab gold and leaving rivals gasping in astonishment. He led Italy to sprint relay gold too, a glorious double in that country's remarkable year of success.

Emma Raducan-who? From A level exams to US Open top marks

Twelve months ago – no, make that barely six – London-based Raducanu was simply not a factor in grand slam discussions. Fresh out of school, she had to fight to earn a wildcard for Wimbledon when organisers initially baulked at the idea, but they were persuaded and Raducanu went on to reach the fourth round. The teenager who was born in Canada and has a Romanian father and Chinese mother had arrived, but it was at the US Open that she roared into the history books. There was no wildcard in New York for the British youngster, but Raducanu won three qualifying matches and then raced through the main draw, defeating 19-year-old Canadian Leylah Fernandez in the title match. She did not drop a set in 10 matches and became the first women in the Open era to win 10 main-draw matches in her first two grand slams. It made her the first qualifier to win a slam and the first US Open women's singles winner since Serena Williams in 2014 to triumph at the tournament without dropping a set along the way. The $2.5million in prize money was followed by endorsement offers from across the world as Raducanu became an instant superstar. The tennis world waits to see what comes next.

No country for old men as US win Ryder Cup

The youngest Ryder Cup team ever assembled by the United States torched European hopes at Whistling Straits in September, scoring a 19-9 victory. That was the widest margin of victory by either side since Europe, rather than Great Britain and Ireland, became the USA's opposition in 1979. Dustin Johnson bounced back from losing four of his five matches in the 2018 edition to finish with a 5-0 record, just the third player in US v Europe battles to finish with a perfect record (after Larry Nelson in 1979 and Francesco Molinari in 2018). Johnson, at 37, was the oldest player on the team. European veteran Lee Westwood matched Nick Faldo's record of 11 appearances in the match, while Sergio Garcia stretched his points record from 25.5 to 28.5 as he and Jon Rahm combined well, but it was emphatically an event that belonged to the host Americans.

Veteran Mickelson still had his day 

He might have been absent for the US team's Ryder Cup triumph, but Phil Mickelson's name was up in lights again as he became the oldest winner of a men's golf major, landing the US PGA Championship title in May. At the age of 50, Mickelson caused a huge upset at Kiawah Island, scooping his sixth career major when he held off Brooks Koepka and Louis Oosthuizen on the final day. It was his only top-10 finish of the year on the PGA Tour.

Federer bagelled, Djokovic denied Golden Slam

Strange things happened in men's tennis in 2021, not least the sight of Roger Federer suffering a 6-0 'bagel' at the end of a straight-sets Wimbledon quarter-final defeat. That happened against Hubert Hurkacz in July, and it was the last match Federer played in the year. He wants to play again, and the 40-year-old believes he can, but knee surgery will keep him out of action until mid-2022 at the earliest, by his own reckoning, and that Centre Court defeat to Hurkacz could turn out to be how his eight-title Wimbledon career ends. Novak Djokovic joined Federer and Nadal on a joint-record 20 grand slam titles by cleaning up at the Australian Open, French Open and Wimbledon, and he has now spent a record 353 weeks at number one, passing Federer this year. But Djokovic could not make it a Golden Slam, losing to eventual champion Alexander Zverev in the Olympic Games semi-finals, and a Grand Slam was just beyond him too, Daniil Medvedev winning his first major when he swept the Serbian in straight sets in the US Open final.

Another year, more records for Brady

At the age of 43, Tom Brady was MVP in the Super Bowl as he led the Tampa Bay Buccaneers to their 31-9 win over the Kansas City Chiefs in February. He now has seven Super Bowl wins behind him, another outright record, and has been MVP in the game on an unmatched five occasions. Brady, having turned 44 in August, is in the hunt for another Super Bowl ring and perhaps outright NFL MVP honours this season, although Aaron Rodgers will likely deny him the latter accolade. Still, the records keep coming for Brady. He has moved in front of Drew Brees to have the most pass completions in league history (7,200 and counting), become the first ever 15-time Pro Bowler, and in December became the first quarterback to throw 700 career touchdowns.

England's Ashes surrender calls for Root and branch review

Joe Root became the first England captain – or player, indeed – to suffer nine defeats in Tests starting in a single calendar year, in a strange 12 months for the Yorkshireman. His form with the bat has been up there with the best of his career, the 31-year-old scoring 1,708 Test runs to go third on the all-time single-year list, with only Mohammad Yousuf and Viv Richards ahead of him. Even in the Tests that England have lost, Root has made a number of handy contributions with the bat, scoring 648 runs at an average of 38.11. Overall he has scored 26 per cent of England's Test runs across the year, the highest proportion of any player for their respective team in 2021. Yet the Ashes were lost by lunch on day three of the third Test, an outrageously dismal result. Root top-scored in England's two innings in Melbourne, typically, but he cannot get a tune out of many of his team-mates, so ends the year with his future as skipper in doubt.

Curry still hot as NBA records fall

In January, LaMelo Ball became the youngest player to post a triple-double in the NBA, as the 19-year-old Charlotte Hornets prospect grabbed 22 points, 12 rebounds and 11 assists in a win over the Atlanta Hawks. Come December, the Memphis Grizzlies set two records in the same game, scoring a franchise-high number of points and winning by the biggest margin in NBA history, as they handed out a 152-79 thrashing to the Oklahoma City Thunder. December was also the month when Steph Curry of the Golden State Warriors set a new three-pointer record, becoming the first man to make 3,000 threes in a career after going past Ray Allen's previous NBA record of 2,973.

Maverick McNealy stumbled but held on for a share of the lead alongside Jim Knous after the third day at the Fortinet Championship at Silverado Resort in California on Saturday.

Knous, playing on his second-to-last start of a medical extension, stormed into the joint lead with a seven-under 65 highlighted by five consecutive birdies on his front nine. It is the first time Knous has held a lead in his PGA Tour career.

The 31-year-old American was 30 at the turn, before birdieing two of the final three holes, including sinking a 17-foot putt. He hit 11 of 18 greens in regulation.

Knous joined McNealy at the top of the leaderboard at 14 under, after the 25-year-old Californian had held a two-stroke lead at the halfway point.

McNealy endured a dramatic day, bogeying four holes on the front nine, but steadied with four birdies on the final six holes to finish two-under 70 and retain a share of the lead.

The pair are two shots ahead of Max Homa, Scott Stallings, Mito Pereira, Troy Merritt and Beau Hossler.

Homa also shot a seven-under 65 to move up the leaderboard, with nine birdies and two bogeys for the day, carding 30 on the back nine.

Talor Gooch is alone at 11 under, ahead of 2021 PGA Championship winner Phil Mickelson who is one of 10 players with 10 under after three rounds.

After a bogey on the 12th hole, 51-year-old Mickelson rallied by birdieing five straight holes to stay in the hunt. The veteran finished the day with seven birdies for a five-under 67.

Maverick McNealy soared to the top of the leaderboard at the halfway stage of the Fortinet Championship, but John Rahm's PGA Tour season debut ended in the world number one missing the cut.

McNealy earned a two-stroke lead following the second round of the 2021-22 season opener at Silverado Country Club, where the 25-year-old American carded an eight-under-par 64.

It is McNealy's lowest opening 36-hole score (68-64) on the PGA Tour.

However, Spanish star Rahm failed to qualify for the weekend after back-to-back rounds in the 70s in Napa, California.

Tuning up for the Ryder Cup, Rahm – who missed Wednesday's pro-am due to a stomach ailment, having placed second in the FedEx Cup play-offs – never got going, an opening-round 72 followed by a 71 as he finished one under, below the three-under cut line.

"I get to rest a couple extra days and be able to figure out what's going on with my swing, which technically is not really anything bad," said Rahm, who recorded his 13th missed cut in his 113th PGA Tour start, with his last missed cut at this year's Wells Fargo Championship.

"It's just I think a lot of those swings were made to look worse because of how tough it is out there."

Beau Hossler (64) and Mito Pereira (67) are tied for second and two shots adrift of McNealy heading into Saturday's third round, while Troy Merritt (68), Will Zalatoris (67) and Bronson Burgoon (67) are a stroke further back at nine under.

Rookie David Lipsky's second-round 64 was a nine-stroke improvement on his first round and a career-low round that included nine birdies, the most he has managed in a single round on Tour.

Lipsky is seven under through 36 holes, alongside the likes of Tom Hoge (66) and Peter Malnati (66), while Masters champion Hideki Matsuyama is a shot back following his three-under-par 69.

Six-time major champion Phil Mickelson posted a 69 to be tied for 24th and seven shots off the pace.

Phil Mickelson and Fred Couples have been named vice-captains for the 2020 Ryder Cup by United States captain Steve Stricker. 

Stricker's other vice-captains are Jim Furyk, Zach Johnson and Love, meaning there is no place in the leadership team for Tiger Woods. 

Mickelson will not be a playing member of the team for the first time after 12 consecutive appearances – a record for Team USA – dating back to 1995. He also holds the national record for four-ball points won (nine) and matches played (47). 

Although the 51-year-old became the oldest player in history to win a major at the US PGA Championship back in May, it was his only top-10 finish this year. 

Couples served as a vice-captain to Davis Love III in 2012 and made five appearances as a player, the last of which came in 1997. 

"I've been staying in close contact with both Freddie and Phil, talking about all things Ryder Cup, for a while now," Stricker said in a statement. 

"They provide honest and impactful feedback, and both have such a passion for the Ryder Cup. I'm honoured that they were willing to join our team and help put us in the best position to win in a few weeks at Whistling Straits."

The tournament, which was postponed last year due to the COVID-19 pandemic, is due to be played at Whistling Straits from September 24-26. 

"I'm humbled and honoured to be a part of this year's Ryder Cup as an assistant captain," Mickelson wrote on Twitter. 

"Thank you captain Stricker for including me and I hope to help in any way possible."

Bryson DeChambeau turned in a spectacular second round at the BWM Championship, shooting a career-best 60 Friday to rocket to the top of the leaderboard. 

DeChambeau carded a pair of eagles and eight birdies in a flawless round at Caves Valley Golf Club near Baltimore, Maryland, leaving him 16 under par for the tournament. 

Play was suspended due to darkness with 15 players still on the course, including first-round leader Jon Rahm. The second round of the FedEx Cup play-off event will conclude Saturday morning before the third round begins. 

Through the 15 holes he completed Friday, Rahm was one stroke back of DeChambeau at 15 under. Earlier in the day, Patrick Cantlay finished his round at 15 under after shooting 63. 

Sergio Garcia (67) and Im Sung-jae (65) were four back of DeChambeau at 12 under, while Hudson Swafford (66) was in at 11 under along with Sam Burns, who had one hole left to play. 

Rory McIlroy (70) was at 10 under with Abraham Ancer, who was four under for the round through 16 holes. 

The story of the day, though, was DeChambeau's run at a 59, which he said entered his mind after his eagle at 16.

He had putts for birdie at 17 and 18 but could not convert, saying his simply misread the six-foot putt on the last. 

Despite coming so close to the magic number, the American did not lament the final miss. 

"It's just one shot," he said. "There's plenty of holes where I could have made a birdie somewhere else not making it, I still executed a good putt, just didn't break the way I wanted it to. That's all I could ask for."

DeChambeau's previous low round was 62 at the Shriners Hospitals for Children Open last October and he was pleased to play as well as he did Friday. 

“It was an awesome opportunity," he said. "I had a couple birdie opportunities at 17 and 18, and it didn't happen but I’m still really proud of the way I handled myself, and it's great to feel some pressure again which is awesome.

“A lot of putts went in. A lot of things went right. We got a lot of great numbers out of the rough today, and I played my butt off and never thought too much about anything until the last few holes."

Elsewhere in the 69-man field, Olympic gold medallist Xander Schauffele (68) was at nine under, one shot better than Masters champion Hideki Matsuyama (69). 

Three-time tournament winner Dustin Johnson (70) was at seven under along with Brooks Koepka (67). 

Among those well back of the lead were Jordan Spieth (70) and Lee Westwood (70) at three under. Phil Mickelson was there, too, after completing just 13 holes Friday. 

Open Championship winner Collin Morikawa brought up the rear at three over for the tournament following a 75 that saw him card three bogeys and no birdies. 

Jon Rahm credited "Ted Lasso" for his magnificent display in the opening round of the BMW Championship as the world number one and defending tournament champion earned a share of the three-way lead.

Rahm carded a flawless eight-under-par 64 to top the leaderboard by one shot alongside fellow star Rory McIlroy and Sam Burns in the second PGA Tour FedEx Cup play-off event in Maryland, Baltimore on Thursday.

At The Northern Trust, Rahm appeared on track to claim the opening FedEx Cup tournament before fizzling out as the Spaniard fell short of a play-off in Monday's finish at Liberty National.

Rahm, however, bounced back at Caves Valley Golf Club, where he invoked the "Ted Lasso" mentality – the star character of the popular television show featuring Jason Sudeikis.

"I must say, for all those 'Ted Lasso' fans out there, be a goldfish," Rahm – second in the FedEx Cup rankings – said post-round after holing eight birdies without dropping a shot. "If you haven't seen the show, you've just got to check it out.

"Played great golf last week, just a couple bad swings down the stretch, and that's the most important thing to remember."

Former world number one McIlroy, who lamented fatigue prior to Thursday's first round, opened his BMW Championship campaign with an eagle, seven birdies and a bogey.

The 2016 and 2019 FedEx Cup champion enjoyed a bogey-free front nine, highlighted by the Northern Irishman's four birdies.

Burns, like Rahm, made it through 18 holes without dropping a shot as the American tallied eight birdies, including four in a row from the 11th to the 14th.

In a 70-man field, reduced from the top 125 points leaders at The Northern Trust, Sergio Garcia is one stroke adrift of the trio, while Abraham Ancer and Patrick Cantlay – fourth in the rankings – are six under.

FedEx Cup champion and three-time tournament winner Dustin Johnson ended the day five under following his first-round 67, alongside the likes of points leader Tony Finau, Xander Schauffele and Masters holder Hideki Matsuyama.

Cameron Smith, who lost to Finau in Monday's Northern Trust play-off, is four shots behind the leaders and he is joined by Phil Mickelson, Bryson DeChambeau and 2017 FedEx Cup winner Justin Thomas.

Four-time major champion Brooks Koepka posted a two-under-par 70, while Jordan Spieth shot a 71.

Jon Rahm claimed the outright lead following the second round of The Northern Trust, but the world number one was not completely happy as he voiced his frustration with the FedEx Cup play-offs format.

Rahm carded a four-under-par 67 for a one-stroke advantage at the halfway stage of the opening FedEx Cup play-offs tournament on Friday.

In a tie with Justin Thomas for the three-shot lead following Thursday's round, Spanish star Rahm ended day two alone atop the leaderboard at Liberty National Golf Club in New Jersey, where the top 125 players are competing.

Rahm – fifth in the FedEx Cup rankings heading into the first of three play-off events – has his fifth career second-round lead/co-lead on the PGA Tour, and third of the season.

He is yet to make a bogey through two rounds – it is the first time in Rahm's PGA Tour career that he has played the first 36 holes without a bogey (110th start).

Rahm, though, was irked at the end of play as he discussed the FedEx Cup format, which sees only one winner of the season-ending Tour Championship and FedEx Cup, having previously seen the possibility of separate champions.

"I don't think it's fair," Rahm said post-round. "I don't like that at all. No. I think you have the play-offs itself, and if you win the first two and if you don't play good in the last one ... you can end up with a really bad finish.

"I don't like it. I understand the system. And the way I was told by one of the PGA Tour officials, [if] I'm a Patriots fans and the Patriots win everything to get to the Super Bowl and they don't win the Super Bowl, you don't win the Lombardi Trophy, right?

"My answer was, they still finished second. They have to understand that golf is different. You could win 15 events, including both play-offs events, and [under the current system implemented last year] you have a two-shot lead. I understand it's for TV purposes and excitement and just making it more of a winner-take-all, and they give you a two-shot advantage, but over four days that can be gone in two holes, right."

Tony Finau's second-round 64 earned second position at 11 under, a shot better off than 2017 FedEx Cup champion Thomas (69), Keith Mitchell (64) and Xander Schauffele (62).

Four-time major champion Brooks Koepka (64) and former world number one Jordan Spieth (62) – second in the rankings – are four strokes off the pace, while Bryson DeChambeau is two strokes further back following his 65.

Rory McIlroy – the 2019 FedEx Cup winner – narrowly avoided the cut at one under following his 70, but defending tournament champion and FedEx Cup holder Dustin Johnson (72) failed to qualify the weekend alongside Adam Scott and Phil Mickelson.

Jon Rahm and Justin Thomas fired eight-under-par 63s to share the three-stroke lead after the opening round of the Northern Trust.

The 2021 FedEx Cup play-offs got underway at Liberty National Golf Club in New Jersey, with the top 125 players eligible to play the PGA Tour event on Thursday.

World number one Rahm (fifth) and 2017 FedEx Cup champion Thomas (ninth) – both in the regular-season top-10 rankings – set the early pace to end day one ahead of nearest rival Harold Varner III.

Rahm was flawless through 18 holes, recording eight birdies, including four of his last six, without dropping a shot, while Thomas birdied four of his last five holes to be level atop the standings.

It is the second time this season Rahm and Thomas have been tied for the lead following a round – both were T1 after day two of the 2020 Masters.

"It probably felt a lot tougher within us than it appeared outside, but at the end of the day, when you're striking it well, it's going to seem easier," Rahm said after enduring gusty conditions. "Scores are out there. We just showed it. That's mainly due to the fact of the softness of the greens."

Thomas holds his third 18-hole lead/co-lead of the season, tied with Sebastian Munoz for the most on Tour.

"It was nice to play well out there in those conditions," Thomas said. "It was very windy, which makes it tough to get the ball close to the hole.

"I had an eight to 10 inch [20-25 cm] putt I almost missed because of a wind gust. I stayed committed to every shot."

Adam Scott, Robert Streb, Mackenzie Hughes, Cameron Tringale, Tony Finau and Kevin Na are tied for fourth, four shots behind the leading duo, while Patrick Cantlay – third in the FedEx Cup standings – is a stroke further back.

Defending tournament and play-off champion Dustin Johnson ended the day seven shots off the pace after mixing four birdies with three bogeys.

Johnson played his round without a driver in his bag, having noticed a small crack in his club, though the American star did not have a backup.

Four-time major champion Brooks Koepka also shot a 70, while 2019 FedEx Cup winner Rory McIlroy settled for an even-par 71 alongside 2018 Northern Trust champion Bryson DeChambeau.

DeChambeau became the fourth player on record (since 1983) to make two or fewer pars and record a score of even-par or better on the PGA TOUR – Jarrod Lyle was the most recent to do so via his two-under 69 (two pars) at the 2011 John Deere Classic.

Former world number one and 2015 FedEx Cup winner Jordan Spieth – second in the rankings – shot a 72 as six-time major champion Phil Mickelson ended the round two over.

Cam Davis earned his first PGA Tour win, defeating Troy Merritt on the fifth play-off hole to clinch the Rocket Mortgage Classic trophy.

After going eagle-birdie on the final two holes of regulation to make the three-way playoff, 26-year-old Australian Davis triumphed over Merritt and Joaquin Niemann to reign supreme on Sunday.

It was the second consecutive week a marathon play-off was needed to determine a winner, after Harris English prevailed on the eighth extra hole to claim the Travelers Championship.

After the trio finished 72 holes at 18 under par, Chilean golfer Niemann went out on the first play-off hole, the par-four 18th, with a bogey his first of the week as he settled for his third runners-up performance this season.

Davis and Merritt duelled from there, matching scores on the 15th, 16th and 14th before returning to the par-three 15th hole again. 

There, Davis finally closed Merritt out, making par while the American bogeyed the hole. 

Davis became the seventh first-time winner on Tour this season. 

"It's been pretty hectic ever since the 17th hole for me, so I just tried to put as much out of my mind as I could and hit every shot for what it was worth," Davis told CBS after the round.

"As simple as that's said, it's so hard to do when the pressure's on like that, but I just kept on putting good swings on it. I didn't make any putts, but I kept on putting it in play, so it worked out all right."

Alex Noren (64) and Hank Lebioda (68) finished 17 under, while Bubba Watson (64) and Brandon Hagy (68) finished two back of the leaders at 16 under. 

Former world number one Jason Day had his best round of the week with a 66 but finished five strokes adrift of the play-off group, along with Keegan Bradley (68) and others. 

Among other notables, Patrick Reed (67) and Rickie Fowler (71) finished 10 under, while Phil Mickelson's third consecutive 72 left him at three under for the tournament. 

Troy Merritt joined Joaquin Niemann atop the leaderboard heading into the final round at the Rocket Mortgage Classic thanks in part to a remarkable hole-in-one. 

In search of his third PGA Tour title and first in nearly three years, Merritt was one stroke better than Niemann (68) in the third round and turned in the highlight of the day in Detroit. 

The American's tee shot on the 218-yard 11th bounced on the green and arced straight into the cup, setting off a celebration in the gallery. 

It was Merritt's first ace in PGA Tour play and momentarily gave him a three-shot lead, but he spent more time after the round stewing over his bogey on the following hole. 

"The big thing is, when you get out in front, don't go back to the guys behind you," he said. "Make them come and get you." 

Niemann enjoyed a steadier day, carding birdies on the first and last holes to book-end his third consecutive bogey-free round and sit at 14 under par for the tournament. 

The Chilean will try to run down his first win since the 2019 Greenbrier Classic on Sunday, but he and Merritt will have plenty of competition. 

Hank Leiboda (66) and Cam Davis (67) begin the final round one stroke back, with Brandon Hagy (68) two back at 12 under and six more golfers at 11 under. 

Among the notables down the leaderboard, Rickie Fowler and Keegan Bradley are at nine under after carding 68s, with Bubba Watson (67) one stroke behind them. 

Former world number one Jason Day (69) is at seven under, Patrick Reed (70) at five under and Phil Mickelson at three under after a second consecutive round of 72. 

Joaquin Niemann and Tom Lewis are tied for the one-shot lead at the halfway stage of the Rocket Mortgage Classic, where defending champion Bryson DeChambeau missed the cut.

Niemann and Lewis both carded three-under-par 69s in the second round of the PGA Tour tournament in Detroit on Friday.

Eyeing his second PGA Tour title and first since the 2019 Greenbrier Classic, Chilean golfer Niemann was bogey-free as he recorded three birdies to reach 10 under through 36 holes.

Englishman Lewis – a two-time European Tour champion but without success on the PGA circuit – was also flawless following three birdies without a dropped shot on day two.

Lewis is making his 45th career PGA Tour start. In his first 43 starts, he played the opening 36 holes in 134 or better once (134/2020 Shriners Hospital for Children Open). The 30-year-old has now done it in each of his last two starts – 134 at Travelers Championship and this week's Rocket Mortgage Classic.

Troy Merritt (68), Chris Kirk (68) and Max Homa (65) are a shot off the pace heading into the weekend, while overnight leader Davis Thompson (73) is among a group of players tied for sixth at eight under.

Former world number one Jason Day could only manage a second-round 73 as he fell to four under, six shots behind the leading pair – a stroke better off than Patrick Reed (72) and six-time major champion Phil Mickelson (72).

US PGA Championship winner Mickelson played the final two holes in one-under to finish three under, just a shot above the cut line.

"I am tired of trying to fight to make cuts. I want to get in contention, because that's what's so much fun, like it was at the PGA, just being in contention and having a chance," Mickelson said.

DeChambeau (71) was not so fortunate as the big-hitting American's title defence came to an end after just two rounds at one under.

Meanwhile, Masters champion Hideki Matsuyama was forced to withdraw before his second round after testing positive for coronavirus.

Davis Thompson tied the 18-hole scoring record at the Rocket Mortgage Classic after earning the opening-round lead.

Thompson – in his third PGA Tour tournament as a professional – carded a nine-under-par 63 to claim a two-stroke lead in Detroit, where play was suspended due to darkness on Thursday.

The 22-year-old surprisingly leads at Detroit Golf Club following a flawless first round which featured nine birdies to match the 18-hole scoring record at the event, joining Nate Lashley and J.T. Poston (both in 2019).

"Sounds good on Sunday," Thompson said afterwards, having been a collective six-over par in his six previous starts on tour (four as an amateur). "It's only Thursday. I know I've got a long way to go."

"I’ve played in a few pro events now, so you've just got to keep your emotions in check," Thompson said. "Anything can happen. I know I'm playing well, so I'm just going to have some confidence going into [Friday] and hopefully I can play another good round."

Brandon Hagy, Tom Lewis and Joaquin Niemann are two shots off the pace heading into Friday's second round, while Seamus Power and J.J. Spain are a stroke further back.

Former world number one Jason Day ended the opening day five under following his 67 as six-time major champion and US PGA Championship winner Phil Mickelson posted a 69 to be level with the likes of Patrick Reed.

Masters champion Hideki Matsuyama opened his tournament with a two-under-par 70.

As for defending champion Bryson DeChambeau, the big-hitting American shot an even-par 72.

Trying to successfully defend a PGA Tour title for the first time, world number six DeChambeau mixed three birdies with three bogeys.

It comes as DeChambeau and caddie Tim Tucker take some time apart.

"They have gone their separate ways for now," DeChambeau's agent Brett Falkoff told ESPN. "That doesn't mean forever, but it means they are not working together now. They met last night and decided to move on.

"It's just an accumulation of things, and it's never easy when a player and caddie split up. They just decided the best situation for now was essentially to not be together anymore."

Former world number one Jason Day leads the Travelers Championship heading into the weekend after surging to the top of the leaderboard following two rounds.

Day went low in the second round on Friday, carding a bogey-free and Travelers Championship career-best eight-under-par 62 to claim a one-stroke lead at TPC River Highlands.

Winner of the 2015 US PGA Championship and a 12-time PGA Tour champion, Day's career has been hampered by lingering back problems.

Day withdrew from the Memorial Tournament due to a back injury and did not qualify for the U.S. Open, having missed three consecutive cuts before tying for 44th at the PGA Championship.

But Day enjoyed a return to form as the Australian star earned his first lead/co-lead at a non-major tournament since 2017 thanks to a flawless round, which included eight birdies.

"Sometimes when you do have sort of an injury or stiffness, even if you're sick, sometimes you can come out and play some good golf," he said. "I was fortunate enough to not really get in my own way today."

Three-time Travelers Championship winner Bubba Watson (66) and co-overnight leader Kramer Hickok (69) are tied for second at eight under through 36 holes.

Hickok was 10 under before crumbling at the par-three 16th hole, where he three-putted from 18 feet for a double-bogey to end the day alongside Watson.

Russell Henley (66), Kevin Kisner (63), Seamus Power (67), Justin Rose (63), K.H. Lee (64), Brice Garnett (68) and Troy Merritt (65) are all seven under heading into Saturday's third round.

Big-hitting American star Bryson DeChambeau followed up his first-round 69 with a four-under-par 66 to be four strokes off the pace, alongside the likes of 2012 champion Marc Leishman (66) and Patrick Reed (66).

Four-time major champion Brooks Koepka also recorded another round in the 60s – a second-round 67 – to be a shot further back.

PGA Championship winner Phil Mickelson (69) and defending champion Dustin Johnson (68) finished just a shot above the cut line at two under to qualify for the weekend.

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