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. 

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