Donna Vekic produced a spectacular second set to shock world number seven Maria Sakkari 7-6 (7-3) 6-1 in the first round of the San Diego Open on Tuesday.

After a hard-fought first set where both women were able to convert one of their four break point opportunities, Vekic took control in the tie-breaker and carried that momentum in the second set.

Vekic won 65 per cent of her service points in the second set, while Sakkari could only muster a 47-per-cent success rate, despite having a significant edge in first-serve accuracy (79 per cent to Vekic's 53 per cent).

The Croatian only had two break point opportunities, and that is all she needed, taking both to run away with one of the biggest wins of her career.

Vekic will play Karolina Pliskova in the second round after the Czech defeated America's Caroline Dolehide 6-3 6-4.

Pliskova, ranked 22nd in the world, had no issue with the world number 181 in one of Tuesday's biggest mismatches, nabbing a break-to-love in the first set before taking a quick double-break to begin the second.

World number 11 Daria Kasatkina was too strong for Leylah Fernandez, cruising to a 6-2 6-2 victory in exactly one hour.

Sloane Stephens earned a shot against world number five Aryna Sabalenka in the second round after getting the better of Switzerland's Jil Teichmann 6-1 7-6 (7-2).

World number 13 Garbine Muguruza was clearly not at 100 per cent, retiring hurt after losing the first five games of her match against China's Qinweng Zheng, and Coco Gauff will resume her contest against Robin Montgomery leading 6-3 3-2 after rain halted the action for the day.

Serena Williams highlighted the first day of the Canadian Open, defeating Nuria Parrizas-Diaz 6-3 6-4 for her first win since the 2021 French Open.

In doing so, Williams became the fourth player since 2000 to win a WTA-level main draw match after turning 40, joining sister Venus Williams, as well as Kimiko Date Krumm and Martina Navratilova.

She also claimed the all-time record for wins at the Canadian Open, with 35, now one more than Chris Evert.

"I guess there’s just a light at the end of the tunnel," Williams said after the match. "I don’t know, I’m getting closer to the light. Lately that's been it for me. I can’t wait to get to that light."

She added: "I love playing though, so it’s like amazing. But I can’t do this forever. Sometimes you just want to try your best to enjoy the moments and do the best that you can."

Williams' older sister Venus, 42, was beaten on Monday by Swiss Jil Teichmann 6-2 6-3 with the match finshing after midnight following a delayed start due to rain.

One of the three seeded players in action on Monday, 15th seed Simona Halep had no issues cruising through the challenge of Donna Vekic 6-0 6-2.

It was similarly smooth sailing for 14th seed Karolina Pliskova in her all-Czech showdown against Barbora Krejcikova, winning 6-3 6-4, while Latvian 16th seed Jelena Ostapenko handled the challenge of Ukraine's Anhelina Kalinina 6-4 6-2.

Kazakhstan's Elena Rybakina defeated in-form qualifier Marie Bouzkova 7-5 6-7 (3-7) 6-1, likely earning a shot at Coco Gauff if the American wins as a heavy favourite tomorrow, while Brazil's Beatriz Haddad Maia beat Italy's Martina Trevisan 6-2 2-6 6-2 in a meeting of two top-30 players.

In a pair of all-American battles, Sloane Stephens edged Sofia Kenin 6-2 7-6 (7-5) 7-5, and world number 187 Asia Muhammad upset world number 25 Madison Keys in straight sets 7-6 (7-5) 6-4.

Alize Cornet defeated her French compatriot Caroline Garcia 3-6 6-3 6-3, and Canada's Katherine Sebov was unable to get the job done in front of her home fans, going down 6-3 2-6 5-7 to Yulia Putintseva.

In better news for the Canadians, Leylah Fernandez won 6-4 6-7 (2-7) 6-3 over Storm Sanders, while veteran two-time Wimbledon winner Petra Kvitova was beaten by Alison Riske 6-2 4-6 6-3.

Leylah Fernandez's French Open run came to a halt as the teenager fell short against Martina Trevisan.

Fernandez was the favourite heading into her second grand slam quarter-final, but despite showing strong resolve, last year's US Open runner-up ultimately could not match Trevisan, who prevailed 6-2 6-7 (3-7) 6-3.

Trevisan, who reached the Roland Garros quarters in 2020 and won her first singles title in Rabat prior to the French Open, set the tone by breaking Fernandez in the first game, and the 19-year-old's task was made more difficult when she required medical treatment for a right foot problem.

The first set went Trevisan's way in 35 minutes, but Fernandez rallied with the first break of set two.

Trevisan broke straight back before holding from 0-40 down, and Fernandez's resolve was tested further in the next game, yet a misdirected forehand down the line saw the Canadian hold.

Fernandez sent a forehand wide to hand the world number 59 the chance to serve out the win, but Trevisan could not capitalise at match point as her opponent went from the brink of defeat to levelling the tie.

But if the momentum seemed with Fernandez after the tie-break, then Trevisan firmly regained control by reeling off seven straight points to start the decider.

Fernandez saved the first two break points, yet Trevisan clinched the third, and after an almighty tussle in game four, the Italian claimed a key double break.

Although world number 18 Fernandez claimed one of those back, Trevisan had the bit between her teeth and, for the second time, had the chance to serve out the match.

Again, the opportunity slipped from her grasp, and a swift hold from Fernandez piled the pressure on.

This time, Trevisan held her nerve – a wonderful serve setting up a second match point, which she took with a fantastic cross-court forehand.

Data Slam: Lesser-spotted all left-hander clash as Trevisan joins exclusive club

Tuesday's match was the first French Open women's quarter-final featuring two left-handed players since 1981, when Martina Navratilova went up against Sylvia Hanika.

Trevisan is the eighth Italian female player to reach the semi-finals in a grand slam after Maud Levi, Annalisa Bossi, Silvana Lazzarino, Francesca Schiavone, Sara Errani, Roberta Vinci and Flavia Pennetta.

WINNERS/UNFORCED ERRORS
Trevisan – 43/29
Fernandez – 29/44

ACES/DOUBLE FAULTS
Trevisan – 1/7
Fernandez – 0/4

BREAK POINTS WON
Trevisan – 7/14
Fernandez – 4/10

Leylah Fernandez is thriving again thanks to her "underdog" spirit as last year's US Open runner-up mounts a Roland Garros challenge.

The Canadian produced an against-the-odds run in New York, before losing out to fellow shock finalist Emma Raducanu, and it might just be happening again at the French Open for the 19-year-old.

A fluent French speaker, she has the home crowd behind her and was a popular 6-3 4-6 6-3 winner against American Amanda Anisimova on Sunday, reaching the quarter-finals in Paris for the first time.

Fernandez has an Ecuadorian-born father, Jorge, who serves as her coach, and the teenager said she hoped a little "Latino fire" could propel her deeper into the tournament.

"Every time I step out on the court I still have something to prove," said Fernandez. "I still have that mindset I'm the underdog.

"I'm still young, I still have a lot to show to the people, to the public so that they can just enjoy the tennis match. That's ultimately my goal, and that's why I want to do well in matches."

Fernandez, a big football fan, was delighted to show Thierry Henry exactly what she can do as the former Arsenal, Barcelona and France striker watched on from the stands.

"To see him do a standing ovation for our match is just an incredible feeling and hopefully I can reproduce that level again," Fernandez said.

"I just love that players are bringing their own personality and their own culture on court."

Referring to her next opponent, Martina Trevisan, Fernandez said: "She's Italian, so they are very passionate about their sports.

"I think it just brings another good entertainment for the fans. That's what I try to do sometimes too, to bring my dad's Latino culture on court too, bring that fire."

Trevisan, who toppled Aliaksandra Sasnovich in the fourth round, has become just the third Italian women to reach two or more singles quarter-finals at Roland Garros in the Open Era, after Sara Errani (four) and 2010 champion Francesca Schiavone (three).

World number 18 Fernandez is the highest-ranked player remaining in the bottom half of the draw, but she is cautious about acknowledging the opportunity opening up for her.

"Honestly, there is no opening," she said. "All the players that are still present at this stage of the tournament are excellent players.

"They work very hard. They have this winning mentality. So there is absolutely no opening. It will be a difficult match. Each match will be difficult."

Naomi Osaka joined several other big names in falling to a second-round exit at the Madrid Open, although Emma Raducanu cruised to a routine straight-sets win over Marta Kostyuk.

Four-time grand slam winner Osaka crashed to a resounding 6-3 6-1 loss to Spain's Sara Sorribes Tormo, exiting her first tournament on clay since the 2021 French Open, where she withdrew citing mental health issues.

Osaka, who had posted an underwhelming 20-15 record on the surface prior to this week, looked uncomfortable throughout and appeared to struggle with a leg injury during a disappointing second set display.

The 24-year-old was not the only high profile player to be on the receiving end of a shock during a day of drama in the Spanish capital, as several of the competition's seeds failed to secure places in the last 16.

Another home favourite, Garbine Muguruza, fell to a resounding loss of her own as Anhelina Kalinina raced to a 6-3 6-0 victory over the seventh seed, while sixth seed Danielle Collins was thrashed 6-1 6-1 by Canadian Bianca Andreescu.

Fourth seed Maria Sakkari was the highest-ranked player in action, and although the world number five won the first set of her clash with Daria Kasatkina, the Greek eventually fell to a 3-6 6-3 6-1 loss, while 2021 US Open runner-up Leylah Fernandez went down 6-4 6-4 to Jil Teichmann.

One big name who did make comfortable progress, however, was Fernandez's US Open conqueror Raducanu, who eased to a 6-2 6-1 win over Kostyuk to set up a last-16 encounter with another Ukrainian in Kalinina. 

The 19-year-old, who has been quoted as saying she believes clay could prove to be her best surface in the future, was delighted with her victory and enjoying the tournament after dropping just one game in the second set.

"I'm definitely happy with my performance," Raducanu said on court. "Marta's a great opponent - I knew it was going to be a really tough battle. I went out there trying to be really aggressive and it paid off.

"It's my first clay court season and I'm really enjoying it. Madrid is such a cool city and it's got such a great vibe about it. I definitely want to try and stay here for as long as possible."

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