Karolina Muchova was a casualty in the first round of the National Bank Open as she was stunned by Oceane Dodin in Montreal on Monday.

The 14th seed was undone by the French qualifier despite Dodin sending down 10 double faults.

The 6-3 1-6 6-2 success was Dodin's first over a top-25 player this season.

Former U.S. Open finalists and 16th seed Madison Keys was also a first-round casualty, going down 6-3 6-3 to Canadian Rebecca Marino.

Toronto-born Marino, currently ranked 220th in the world, won in one hour and six minutes, converting four of her eight break points, while she saved four from five too.

However, there were no such problems for Ons Jabeur, the 13th seed strolling to a 6-1 6-3 victory over Clara Burel.

Eleventh seed Maria Sakkari also had a routine day, her opponent Marie Bouzkova unable to continue with Sakkari ahead 6-4 3-1.

An Olympic gold medallist in the doubles at Tokyo 2020, Katerina Siniakova had more to celebrate in the singles with a 6-1 6-3 win over long-time rival Jelena Ostapenko.

Elsewhere in the draw, Paula Badosa, Sorana Cirstea, Amanda Anisimova, Nadia Podoroska and Fiona Ferro all progressed.

The in-form Angelique Kerber excelled again at Wimbledon, defeating Karolina Muchova in straight sets to return to a major semi-final for the first time since her 2018 All England Club title.

Kerber is a three-time grand slam champion but had been badly out of sorts before returning to the grass courts this season.

First-round exits at both the Australian Open and the French Open were quickly forgotten as she claimed silverware on the WTA Tour for the first time in almost three years at the Bad Homburg Open, however.

And Kerber's latest victory in SW19 – 6-2 6-3 against Muchova in an hour and 15 minutes – extended her winning run to 10 matches, now within two of a second Wimbledon crown.

The German's experience had told as she outclassed Coco Gauff on Monday and she started in the same fashion, swiftly breaking to seize control of the opener.

Kerber was comfortable thereafter until a miscued volley teed up Muchova's first break-point opportunity. She recovered, though, a gorgeous dropshot securing a vital hold.

Muchova appeared to lose confidence at that point and the set was wrapped up as she was broken to love, her double fault followed by an effort that clipped the net and bounced wide.

Kerber's first setback followed early in the second – a backhand wide after saving the first of three break points – yet Muchova then again bowed to pressure, firing long as she attempted to accelerate a tense rally.

As the momentum swung back in Kerber's favour, she showed no signs of relenting, preying on another wild Muchova error as she outmanoeuvred the 24-year-old to create an open court and break once more.

Muchova fought to forge an opening as Kerber served for the match but could not capitalise and paid again for an aggressive approach, stepping forward and blazing wide to settle the result.

Data Slam: Kerber calm and in command

Kerber's early break piled the pressure on Muchova and her attempts to battle back only did more damage. The Czech attempted four approach shots – to Kerber's none – as she sought to go on the offensive, but all four missed the target.

Consider her only double fault in the entire match teed up set point in the opener and Muchova might wonder if this was just not her day.

WINNERS/UNFORCED ERRORS

Kerber – 15/21
Muchova – 9/27

ACES/DOUBLE FAULTS

Kerber – 1/4
Muchova – 1/1

BREAK POINTS WON

Kerber – 4/6
Muchova – 1/8

Naomi Osaka suffered a shock second-round exit to Karolina Muchova at the Madrid Open, but there was no such trouble for Simona Halep as she held off Zheng Saisai.

Second seed Osaka was playing just her second match on clay since the 2019 French Open due to injury issues and became the latest big name to fall at the hands of Muchova.

The world number 20, who had already defeated two top-five players this season, prevailed 6-4 3-6 6-1 in a time of one hour and 49 minutes in the Spanish capital.

Osaka has now lost two of her last three matches, having been eliminated from the Miami Open quarter-finals by Maria Sakkari at the end of March.

"I think today for me it was quite different from the last time I lost in Miami, and I actually think I played much better here, so I'm very happy about that," Osaka said.

"I think what I can take away from this is that I tried my best throughout the entire match. I think tennis-wise, I felt I was too defensive in the first set.

"I wouldn't say I’m happy that I lost, but I think I learned a lot. So that's all I can hope for."

Two-time champion Halep has yet to drop a set in this year's tournament after seeing off unseeded opponent Zheng 6-0 6-4.

Halep took nine games in a row at the start of the match but, like in her opening-round win over Sara Sorribes Tormo, she had to hold off a late surge from her opponent to advance.

Next up for Halep is a last-16 showdown with Elise Mertens, who beat Elena Rybakina 7-6 (7-4) 7-5 in the last of Sunday's matches.

Fifth seed Aryna Sabalenka safely advanced earlier in the day thanks to a 6-3 6-3 win against Daria Kasatkina, while Sakkari beat Anett Kontaveit 6-3 6-1.

Sabalenka was on course to face Victoria Azarenka for a place in the quarter-finals, but the Belarussian withdrew from her match with Jessica Pegula because of a back injury.

Elsewhere, Jennifer Brady, who knocked out fellow American Venus Williams in the first round, eased past Jelena Ostapenko 6-2 6-1.

Brady faces a tricky test in the next round with Anastasia Pavlyuchenkova, who defeated sixth seed Karolina Pliskova 6-0 7-5, seeking another scalp.

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