Canadian teenager Leylah Fernandez booked her spot in the Monterrey Open quarter-finals after easing past Kristina Kucova.

Fernandez cruised into the last eight of the WTA International tournament on Wednesday by defeating Slovakia's Kucova 6-1 6-4 in Mexico.

Kucova had eliminated top seed and 2017 US Open champion Sloane Stephens on Tuesday, but she was no match for the 18-year-old Fernandez midweek.

Next up for Fernandez is Viktoria Kuzmova, who beat lucky loser Harriet Dart 6-4 6-3.

Spanish seventh seed Sara Sorribes Tormo did not have to take to the court, benefiting from a walkover after Kaja Juvan withdrew.

Sorribes Tormo will face Anna Karolina Schmiedlova, who outlasted Jasmine Paolini 2-6 6-2 6-2.

Russian duo Svetlana Kuznetsova and Vera Zvonareva recorded contrasting victories on home soil to reach the last eight of the St. Petersburg Ladies Trophy.  

Kuznetsova - who has won both the French and US Open during her distinguished career - needed just over an hour to get past teenage qualifier Wang Xinyu by a 6-1 7-5 scoreline.  

The 35-year-old converted six of the nine break-point opportunities she created, though was made to work for her win in the second set having previously taken nine of the opening 10 games.  

After failing to serve out for the match when 5-3 ahead, the fourth seed eventually prevailed when recording a break of her own with the score at 6-5.  

Zvonareva, meanwhile, was on court for three hours and 10 minutes as she produced an impressive upset, knocking out third seed Fiona Ferro 6-7 (8-6) 7-5 7-6 (7-2).  

"We both were fighting for every point, trying to hang in there. I think I was able to play some good tennis when it mattered, and I'm happy with the win of course,” Zvonareva said after being involved in the longest match in the history of the tournament, per the WTA's website.  

The 36-year-old came out on top in a deciding tie-break having been unable to hold on to an early 2-0 lead in the set.  

Anastasia Gasanova and Katarina Zavatska had set a new record for the longest contest earlier on Wednesday, the former eventually prevailing 6-2 6-7 (8-6), 7-5 after three hours and four minutes in an eventful first-round tie.

Ekaterina Alexandrova is another Russian player to progress to the last eight, seeing off Tereza Martincova in straight sets.

In the final match, Romanian qualifier Jaqueline Cristian surprised Jelena Ostapenko 6-3 7-6 (11-9) to reach her first ever WTA 500 quarter-final, where her opponent will be Kuznetsova.

Daria Kasatkina fended off fast-rising star Clara Tauson at the St Petersburg Ladies Trophy as the Russian home favourite edged a clash of recent tournament winners.

Former world number 10 Kasatkina, who landed the Phillip Island Trophy title in Melbourne last month, came through a roller coaster second set against the qualifier to tie up a 6-4 7-6 (7-0) first-round victory.

Former junior world number one Tauson won the Lyon Open at the start of March, and the 18-year-old Danish player twice broke when Kasatkina was serving for the match to take their tussle to a tie-break that was then unexpectedly one-sided.

Having been jittery when serving at 5-4 and 6-5, Kasatkina found composure when it mattered to see out the match.

Tauson had won 13 consecutive matches, including qualifiers, and had reeled off 20 successive sets during that run, but Kasatkina interrupted the hot streak.

Three-time WTA tournament winner Kasatkina, seeded eighth this week, said on Amazon Prime: "You're right, I was nervous serving for the match, but I'm glad I could close out the match playing the tie-breaker.

"Sure, there is something to improve, but I don't want to talk about it right now. I'm going to talk to my coach about what I need to improve. She wasn't an easy opponent. She just won a tournament and I knew it was going to be a tough match, and a tough match it was."

Two 19-year-old qualifiers were also among Tuesday's winners, as Chinese player Wang Xinyu and Russian Kamilla Rakhimova safely went through to the last-16 stage.

Nao Hibino was a shock first-round casualty at the Monterrey Open, while fellow seed Ann Li advanced.

Seeded ninth for the WTA International tournament, Japan's Hibino was upstaged 3-6 6-2 6-3 by Jasmine Paolini on Monday.

American eighth seed Li, however, had no such trouble in her 6-3 7-5 victory over Arantxa Rus on the outdoor hard courts.

Coco Vandeweghe – the 2017 Australian Open semi-finalist – suffered another early exit in Mexico.

After being ousted by Mihaela Buzarnescu in the opening round in Guadalajara last week, former world number nine Vandeweghe was eliminated 6-3 6-2 by Canadian teenager Leylah Fernandez.

Fernandez will face either top seed Sloane Stephens or lucky loser Kristina Kucova in the second round.

Anna Karolina Schmiedlova, Nina Stojanovic, Viktoria Kuzmova, Lauren Davis and Tamara Zidansek also progressed from the opening round.

Jelena Ostapenko wasted little time in her opening match at the St Petersburg Ladies Trophy, while there were also wins for Aliaksandra Sasnovich and Vera Zvonareva in Monday's action. 

Ostapenko needed less than an hour to get past Paula Badosa, who caused an upset when the pair met at last year's delayed French Open. 

There was to be no Roland Garros repeat for Badosa, though, as she was swept aside 6-2 6-2.  

The sixth-seeded Ostapenko started her campaign impressively in Russia, producing 26 winners and just eight unforced errors. Her serve was also in good order, never giving her opponent a chance of a break. 

Sasnovich had to work a little harder, rallying from a set down to see off Ana Bogdan 2-6 6-2 6-1. Her reward is a clash with third seed Fiona Ferro, who received a bye through to the second round.

Zvonareva, meanwhile, progressed in straight sets against Arina Rodionova, the Russian dropping just four games during a contest that lasted one hour and 22 minutes.  

Victory was sealed at the second opportunity, a sliced backhand into the net by her opponent sending Zvonareva through to the last 32. 

Garbine Muguruza landed her first title in almost two years with victory over Barbora Krejcikova in Saturday's Dubai Tennis Championships final.

The former French Open and Wimbledon champion has produced some of the best tennis on tour this year but had gone without a trophy to back that up.

However, she put that right with a 7-6 (8-6) 6-3 victory over surprise finalist Krejcikova, a doubles specialist who has never ranked inside the top 50 in singles.

Coach Conchita Martinez has been absent from Muguruza's recent matches after testing positive for COVID-19, keeping tabs with mobile phone footage from courtside.

"She got the virus and was so upset she couldn't come, so this one is for her," Muguruza said.

Muguruza's most recent title had come at the 2019 Monterrey Open, where she successfully defended her title.

She was runner-up at the Australian Open in 2020 and in the early stages of this season made it through to finals at the Yarra Valley Classic and the Qatar Open.

She was beaten by Ash Barty in the first of those, in February, and by Petra Kvitova in Doha last weekend, but Muguruza made sure she did not spurn her latest chance to lift a trophy.

Krejcikova had bizarrely taken a medical break before the match began, seeking treatment on a thumb injury, but that did not prevent her being competitive.

The gruelling first set contained two breaks of serve for each player, and the second was also tightly contested before Muguruza took the title on her second championship point when her opponent went long with a forehand.

Muguruza said on Amazon Prime: "It's a great achievement. I've been coming here for many years and felt I was close but not enough.

"Finally today I got the champion's trophy and I'm very happy after losing a few finals in a row to get this one.

"I feel the consistency is hard to get, but being able to play three finals is a great sign that we are on the right way."

Garbine Muguruza reached the final of the Dubai Tennis Championships after a gruelling victory over Elise Mertens on Friday.

The Spaniard saw six match points come and go in a battle lasting two hours and seven minutes before eventually closing out a 6-4 7-6 (7-5) win.

Having reached the final in Doha last week, where she lost to Petra Kvitova, Muguruza is the fifth player this century to reach back-to-back finals in the Middle East double, after Martina Hingis, Justine Henin, Caroline Wozniacki and Svetlana Kuznetsova.

The two-time major winner has now reached three finals in her past four tournaments and has won 17 matches in 2021.

Despite being ahead for much of the match, Muguruza was nonetheless pushed hard by Mertens, who fought back to beat Jessica Pegula in the quarter-finals after facing three match points.

She led by a set and 5-3 but Mertens continued to come up clutch at key points until Muguruza at last completed the job with a smash in the tie-break.

"You have to be all the time concentrated, otherwise she will come back," she said. "I didn't lose the focus even though I couldn't close it [at first] – I was just looking forward to the next opportunity.

"I didn't think I played bad on the match points. They were just tough points that didn't come to my side. She was very good in defence and on those points, I felt she brought her magic. But I was like, 'Okay, I'm playing well, sooner or later I will convert the match point'. I didn't lose the concentration or get too irritated."

Muguruza will face Barbora Krejcikova in the final, the Czech defeating Jil Teichmann 7-5 6-2.

Krejcikova saved 10 of 11 break points as she reached just the second Tour final of her singles career and has yet to drop a set at this tournament.

The world number 63 is the lowest-ranked singles finalist in history in Dubai, with that previous record held by Virginie Razzano, who was ranked 58 in the world when she lost to Venus Williams in 2009.

Elise Mertens came from behind to clinch a semi-final spot at the Dubai Tennis Championships but Coco Gauff bowed out on Thursday.

Mertens said she "just didn't want to let go" after coming back from the brink to end Jessica Pegula's fine run with a 5-7 7-5 6-0 victory.

The Belgian looked to be heading out when she faced a 5-2 deficit in the second set, yet saved three match points to force a decider.

"I kept on fighting and that was the spirit today," said world number 18 Mertens.

Former world number one Muguruza is Mertens' semi-final opponent, the Spaniard having come from a set down to beat third seed Aryna Sabalenka 3-6 6-3 6-2.

Muguruza lost out to Petra Kvitova in the final of the Qatar Open last week, but looks on top form as she closes in on another championship match.

Sabalenka fell foul of Muguruza in Doha, and the Belarusian was unable to gain revenge as the ninth seed earned a 16th win of the season.

There was to be no place in the last four for 16-year-old Gauff, who came up short against world number 54 Jil Teichmann.

Gauff, who defeated Teichmann twice in Australia in February, was broken to go 5-3 down in the first set and could not respond.

A second break in Teichmann's favour put Gauff on the back foot in the second, and the Swiss then saved three break points to nose into a 3-1 lead.

The contest was settled on Gauff's serve – Teichmann taking the match at the second time of asking to tee up a last-four clash with Barbora Krejcikova, who beat Anastasia Potapova 6-0 6-2 in a little over an hour.

Krejcikova was beaten in the doubles final last year, and has claimed her place in the singles semi-finals of a WTA 1000 event for the first time.

Garbine Muguruza made light work of Iga Swiatek to book her place in the quarter-finals of the Dubai Tennis Championships.

The in-form Spaniard required just one hour and nine minutes to win 6-0 6-4 against the number eight seed and reach the final eight for the fourth time in seven appearances at the tournament.

Reigning French Open champion Swiatek came into the contest on a six-match winning streak but her resistance seemed to falter after she dropped serve in the opening game and then failed to capitalise on two break points in the second.

Muguruza, whose 2021 record now stands at 15 wins and four defeats, was comparatively ruthless against an opponent who landed with just 38 per cent of her first serves.

The former world number one and double grand-slam champion let a 3-1 lead slip in the second set before resuming control through her punishing forehand, getting the job done on the first match point with an ace.

She will be back into action on Thursday against Aryna Sabalenka. The Belarusian, who beat Anett Kontaveit 6-3 6-2, lost in three sets to Muguruza at the Qatar Open last week.

"Back-to-back matches is good," said Muguruza. "That means I'm playing the top players, that means I'm getting into the deep rounds. I'm looking forward for another battle."

Coco Gauff reached the last eight of a WTA 1000 event for the first time after a straight-sets win over qualifier Tereza Martincova.

The American, who turns 17 on the day of the final, won 6-4 6-2 to set up a showdown with Jil Teichmann, a 6-3 6-3 winner over Ons Jabeur.

Second seed Karolina Pliskova was a surprise casualty, losing in less than an hour to Jessica Pegula. The world number 36, who also beat Pliskova in Qatar, will face Elise Mertens after she beat Caroline Garcia 6-4 6-2.

The last remaining former champion in the draw, Belinda Bencic, suffered disappointment on her 24th birthday as she lost 6-1 2-6 7-5 to wildcard Anastasia Potapova. She will take on Barbora Krejcikova, who eliminated Svetlana Kuznetsova.

Coco Gauff vowed she would continue to "fight fire with fire" after the American teenager won a stormy clash with Marketa Vondrousova at the Dubai Tennis Championships.

After battling for a 3-6 6-0 6-4 victory over the 12th seed to reach the last-16 stage, Gauff explained how the decider became a bitterly disputed affair.

She raised a complaint to the umpire in the opening game of that third set over Vondrousova's serving, specifically how the Czech used her racket to control the ball when she got the ball toss wrong. Gauff questioned whether that was permitted.

Vondrousova shot back: "You do the same."

The umpire told both players he had no objections to Vondrousova's play, but the 2019 French Open runner-up seemed affronted by Gauff's remarks and began to scream with delight when taking points off the youngster.

"I was asking when you toss the ball, are you allowed to catch it with your racket," Gauff told a news conference afterwards.

"I thought you had to catch it with your hand or let it bounce first. The umpire said it's allowed if it's not a motion. It wasn't meant to make her upset; it was just asking the question. I left it there, but I could tell she was a bit frustrated by that."

Not to be outshouted, Gauff also turned up the volume when winning points, and she almost hit Vondrousova with a fiercely driven shot as tension mounted.

"My personality, I fight fire with fire," the unseeded Gauff said, quoted on the WTA Tour website. "I lost the last two points of that game and she had wild screams – and I like to scream, so I screamed back."

It was Gauff's seventh successive three-set match, and she turns 17 on Saturday, the day of the final.

Top seed and two-time former champion Elina Svitolina was beaten by Russia's two-time grand slam champion Svetlana Kuznetsova, who at the age of 35 landed an impressive 2-6 6-4 6-1 win.

French Open champion Iga Swiatek saw off Japan's Misaki Doi 6-2 6-4, and Garbine Muguruza scored a 6-4 6-2 win over American Amanda Anisimova.

Muguruza was beaten by Petra Kvitova in the Qatar Open final on Saturday, but Kvitova could not join the last-16 line-up in Dubai, retiring due to injury when trailing 6-2 3-4 against Swiss player Jil Teichmann.

Elena Rybakina, the 2020 finalist, eased through her Dubai Tennis Championships opener on a second day dominated by the seeds.

Rybakina was beaten in last season's Dubai decider by Simona Halep, one of five WTA Tour finals she reached in a breakout year.

The Kazakh, with two career titles to her name, has not played a final since September, however, and entered this week's tournament with a 4-4 record for 2021.

But her fine form in Dubai continued with a straightforward first match, beating Zheng Saisai 6-0 6-4 in 73 minutes.

"I lost a bit of concentration in the second set," number 14 seed Rybakina said. "Also Saisai played well - she decided to risk stepping in on the returns - so overall I think it was not a bad match."

Garbine Muguruza also built on a final defeat, having come up short in Saturday's Qatar Open decider, thrashed by Petra Kvitova.

Including that event, Muguruza has reached the showpiece match at two of the four tournaments she has entered prior to this latest campaign, which began with a 6-3 7-5 win over Irina-Camelia Begu.

Fellow seeds Madison Keys, Marketa Vondrousova and Anett Kontaveit each also raced through in straight sets.

Petra Martic could not join them, however, going down 7-6 (7-2) 6-4 to Kristina Mladenovic.

Meanwhile, Jessica Pegula continued her rich vein of form in a dominant 6-2 6-1 defeat of Yaroslava Shvedova.

The American reached the quarter-finals of the Australian Open and the last four as a qualifier in Qatar, meaning she is now 11-2 since heading to Melbourne.

One-time French Open winner Jelena Ostapenko also triumphed, while former Roland Garros semi-finalist Amanda Anisimova, still just 19, made a victorious 2021 WTA bow.

But three-time grand slam champion Angelique Kerber continues to struggle for momentum, letting a set lead slip to lose to Caroline Garcia.

Danish teenager Clara Tauson landed a first WTA Tour title as the former junior world number one triumphed at the Lyon Open on Sunday.

The 18-year-old beat Swiss opponent Viktorija Golubic 6-4 6-1 in a final contested by two qualifiers, achieving her breakthrough win in an hour and 29 minutes.

Golubic saved five match points but eventually was put away by Tauson, who has spent most of her senior career to date on the second-tier ITF tour.

She caused a major shock at the French Open in September by beating US Open semi-finalist Jennifer Brady in the first round, and Tauson should now become a more familiar presence at the higher level.

The win carries the youngster into the WTA top 100 for the first time, and it completed an impeccable trip to France that saw Tauson win all seven of her matches, including two qualifying rounds, in straight sets.

She said of her performance: "I think I've been really solid; especially after the first set, I've come out good in every single match."

Quoted on the WTA website, Tauson added: "I just kept my game going. It's been a weird week like that, normally I have some fall-outs, but I haven't had any of those this week, so I'm very happy with that."

Tauson shocked Russian top seed Ekaterina Alexandrova in the first round at the start of the week in Lyon, and Alexandrova lost to another teenager on Sunday as the Dubai Tennis Championships began.

The world number 33 was handed a tough draw against American Coco Gauff, who scraped through 7-6 (7-3) 2-6 7-6 (10-8) in a match lasting two hours and 41 minutes.

Gauff served 12 double faults, including seven in the deciding set, but found a way through to the second round.

Svetlana Kuznetsova, Ons Jabeur and Alize Cornet were among the other winners on day one. The top eight seeds, who include Iga Swiatek, Karolina Pliskova, Elina Svitolina and Petra Kvitova, have all received byes to round two of the WTA 1000 event.

World number 10 Petra Kvitova says Doha feels like home after taking out her second Qatar Open title in her third final in four years over Garbine Muguruza in Saturday's final.

Kvitova needed little over an hour to get past 16th-ranked Muguruza 6-2 6-1, securing her 28th victory on the WTA Tour and first since winning in Stuttgart in 2019.

The Czech was the Qatar Open runner-up last year to Aryna Sabalenka and champion over Muguruza in 2018, while she did not compete in 2019.

"It's been a great run in Doha," Kvitova said on court post-match.

"It's been a great whole week. I just feel like home a little bit. I love the court, I love everything and the people are really friendly as well."

Two-time Wimbledon champion Kvitova hit 11 winners and was dominant on her serve throughout.

After a strong opening set, Kvitova was broken by Muguruza early in the second but the Czech hit back by winning the next six games to secure the win, extending her head-to-head record over the Spaniard to 5-1.

Muguruza said: "Today I think Petra played very well from the baseline, and it was hard to try to make her move, or try to do much… It really wasn't my day."

Petra Kvitova ended the run of qualifier Jessica Pegula to set up a 2018 final rematch against Garbine Muguruza at the Qatar Open. 

Kvitova saw off Pegula in straight sets, triumphing 6-4 6-4, meaning she will be involved in the final of the tournament for a third time in four years. 

Having twice let slip breaks in the opener, the 2020 runner up edged ahead again at 5-4 before serving out for a 1-0 lead. 

Pegula appeared set to draw level when she raced 3-0 ahead in the next, only to be pegged back by Kvitova, who hit 26 winners and the same number of unforced errors. Victory was eventually sealed after one hour and 18 minutes on court. 

The two-time Wimbledon champion secured the trophy in Doha three years ago by beating Muguruza, who did not even have to hit a ball to progress on Friday after opponent Victoria Azarenka withdrew from their semi-final due to a back injury. 

That title showdown in 2018 went the distance, Kvitova rallying after losing the opening set to eventually prevail. 

"I think it's going to be a tough match," Muguruza said, according to the WTA Tour's official website.  

"We played here in another final three years ago, so just looking forward to playing that match and hopefully getting the trophy." 

The Spaniard has been in impressive form this week, ending Aryna Sabalenka's hopes of defending her crown in the last 16 before thrashing Maria Sakkari in a lopsided quarter-final.

Meanwhile, in Friday's action at the Lyon Open, second seed Fiona Ferro rallied from a set down to beat fellow Frenchwoman Clara Burel and reach the semi-finals. 

Ferro's 2-6 6-1 6-3 triumph means she is certain to break into the top 40 in the world for the first time in her career.  

The only other seed left in the draw is Paula Badosa, the Spaniard knocking out Kristina Mladenovic. Her reward is a last-four clash with qualifier Clara Tauson, conqueror of Camila Giorgi in straight sets. 

Petra Kvitova moved a step closer to a second successive appearance in the Qatar Open final after overcoming Anett Kontaveit on Thursday. 

Two-time Wimbledon champion Kvitova lost to Aryna Sabalenka in the 2020 final but has looked on top form throughout the week in Doha. 

Kontaveit proved a tough opponent for the fourth seed, however, and Kvitova – the 2018 champion – needed three sets to progress 6-3 3-6 6-2. 

"I'm really glad that after losing the second set, which I probably didn't play the best, I started very well in the third," said Kvitova. 

"I learned that the return was pretty good from my side. I was going for it – first point, first shot – and I think that made a big difference. In the rally, it was 50-50 and anybody could win it, but when I put the pressure from my return, it was really very nice."

Her reward is a semi-final tie with qualifier Jessica Pegula, who caused an upset by defeating second seed Karolina Pliskova 6-3 6-1. 

Pegula reached the Australian Open quarter-finals last month and played with supreme confidence to oust the 2017 champion and reach her maiden semi-final at a WTA 500 event. 

The other half of the draw will see Victoria Azarenka taking on Garbine Muguruza. 

Azarenka triumphed 6-2 6-4 over top seed Elina Svitolina, with the two-time Doha champion maintaining her unbeaten record against the Ukrainian to reach the 60th WTA semi-final of her career. 

Muguruza, meanwhile, battled past Maria Sakkari 6-3 6-1 to complete the last four. 

At the Lyon Open, French duo Kristina Mladenovic and Clara Burel booked their places in the last eight, beating Margarita Gasparyan and Aliaksandra Sasnovich respectively. 

Spaniard Paula Badosa awaits Mladenovic, while teenage wildcard Burel takes on compatriot and second seed Fiona Ferro in what is her first WTA quarter-final. 

There were also victories for Greet Minnen and Viktorija Golubic.

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