Kiki Bertens, Sloane Stephens and Donna Vekic were dealt shock defeats in the second round of the Pan Pacific Open on Thursday.

The three seeded players came up short to blow the draw wide open, although former world number one and home favourite Naomi Osaka remains in the competition.

Dutch star Bertens was the second seed but failed to recover from a dismal start against 2017 finalist Anastasia Pavlyuchenkova and went down 6-1 7-5 to the Russian in the late match on centre court.

American Stephens, the third seed, had also earlier been humbled as she was knocked out by Camila Giorgi.

The Italian was a 6-0 6-3 winner and faces Elise Mertens in the quarter-finals.

"It was a good match, for sure, and I was able to play my game, show off my attacking style and be consistent," said Italian Giorgi, who lost to Osaka in the last four in 2018.

Giorgi told the WTA's website: "When I play, I always focus on myself. I only made a few mistakes. That's always been my way, ever since I was little, to attack, to go forward, to put the pressure on. This surface suits my game, too."

Wildcard Misaki Doi joined fellow Japanese player Osaka - who went through on Wednesday - in the last eight by beating Vekic, another beaten semi-finalist 12 months ago.

Doi, who is also through to the doubles semi-finals, reached the Japan Women's Open final last week and is maintaining a bid to go a step further this time.

She defeated Croatian Vekic 7-6 (7-5) 6-3, while Kazakhstan's Yulia Putintseva at least avoided an upset, crushing Russian player Varvara Flink 6-1 6-1 to set up a clash with Osaka on Friday.

Anastasia Pavlyuchenkova will meet a familiar foe in the form of Kiki Bertens after comfortably dispatching of Dayana Yastremska 6-3 6-1 in round one of the Pan Pacific Open in Osaka.

World number 28 Yastremska – ranked 13 places higher than her opponent – showed flashes of her ability and power, but she ultimately paid the price for an erratic performance.

Yastremska made 23 unforced errors and could only hit 10 winners in the 55-minute contest, with Pavlyuchenkova's more considered and careful approach paying dividends.

Pavlyuchenkova's dubious reward is a fourth encounter of the year with Bertens, who she lost to at the US Open.

The Russian did come out on top at the Australian Open but was defeated by Bertens in St Petersburg prior to her loss at Flushing Meadows.

Ninth seed Elise Mertens – the highest ranked player in action on Monday – sailed through in similarly comfortable fashion, beating Whitney Osuigwe 6-3 6-1.

Alison Riske had no such fortune, however, losing to fellow American Nicole Gibbs 6-4 6-3 despite the latter being ranked 105 places below her in the WTA rankings.

Reigning Olympic champion Monica Puig crashed out in comprehensive fashion, as Zarina Diyas hammered her 6-0 6-3.

The day's longest contest – by far – lasted two hours and 43 minutes, as Viktoriya Tomova came through 4-6 6-3 6-2 against France's Alize Cornet.

Camila Giorgi was pushed all the way in the first set against Han Xinyun before easing to victory in the second, with her 7-6 (8-6) 6-1 triumph ensuring she was one of few to prevent a surprise.

Naomi Osaka is the top seed for the tournament, though she does not begin her bid for success on home soil until later in the week.

Madison Keys – the fifth seed – starts her campaign on Tuesday, as she goes up against Daria Kasatkina.

Qualifier Magda Linette won an epic final against Camila Giorgi to triumph in the first edition of the Bronx Open, sealing her first WTA Tour title.

In the last WTA event before the US Open, the world number 80 triumphed 5-7 7-5 6-4 in two hours and 33 minutes, topping her sole previous success on the 125k circuit.

Three competitive sets eventually led to Linette taking the victory, while Italian Giorgi lost her second final in the space of 20 days, having suffered the same fate in Washington.

Four of the first five games in the opening set produced breaks and Giorgi ultimately prevailed by striking to love on Linette's serve at 5-5 before converting the first of three set points.

But the Pole has scrapped hard all week, winning seven matches to reach the final, and claimed the second set with some clutch play. 

She saved four break points at a critical moment to move 5-4 ahead and, despite failing to take two set points in the next game, ultimately got the break she needed.

Giorgi, ranked 58, appeared to have regained the ascendancy by breaking in the first game of the decider. However, Linette saved another four break points to stop herself from falling a double break behind.

That changed the momentum and she subsequently rallied from 4-2 down, winning four straight games and claiming the first of two championship points when Giorgi put a forehand into the net, Linette celebrating by embracing her team.

Linette heads to Flushing Meadows on a high and could face defending champion Naomi Osaka in the second round of the US Open.

Camila Giorgi claimed a thrilling semi-final win over Wang Qiang to reach the Bronx Open decider, while Magda Linette also progressed on Friday.

Giorgi saved four match points to edge top seed Wang 4-6 6-4 7-6 (8-6) after two hours, 39 minutes in New York City.

The Italian came from a break down three times in the third set, saving her first match point in the 10th game.

Giorgi squandered a match point of her own in the 12th game before coming from 6-3 down in the tie-break to reach an eighth WTA Tour final.

She will face qualifier Linette, who upset fifth seed Katerina Siniakova 7-6 (7-3) 6-2 in their semi-final.

Linette is into her second WTA Tour decider and lost to Giorgi in three sets when they last met in 2015.

Top seed Wang Qiang advanced to the semi-finals of the WTA Bronx Open, where she will meet Camila Giorgi.

Wang recovered from a first-set bagel to prevail 0-6 6-1 6-4 against Russian lucky loser Anna Blinkova on Thursday.

World number 18 Wang withstood a late fightback in the final set to move through to the final four of the WTA International event.

"I didn't have too much feeling in the first set," Wang said. "In the second set, I started again, so I found my way."

Next up for Wang is Italy's Giorgi, who eased past Alize Cornet 6-2 6-1 earlier on Thursday.

Katerina Siniakova – the fifth seed – saved two match points as she survived to beat wildcard Bernarda Pera 4-6 7-6 (8-6) 6-3 in two hours, 27 minutes.

Siniakova will face Magda Linette for a place in the final after the Polish player outlasted Karolina Muchova 6-7 (4-7) 6-4 7-6 (7-3).

Barbora Strycova achieved her best grand slam singles result when she reached the Wimbledon semi-finals, but the Czech is finding it tough to build on last month's unforeseen success.

Strycova lost in the first round of the Western & Southern Open in Cincinnati, and after a first-round bye at the Bronx Open this week the 33-year-old bowed out in her opening singles match.

The third seed – long considered a doubles specialist – was beaten 3-6 6-2 6-1 by American wildcard Bernarda Pera at the WTA International tournament played in the most northerly of New York City's five boroughs. The venue is a short drive from Flushing Meadows, which stages the US Open next week.

Italian Camila Giorgi came through a tough encounter with experienced German Andrea Petkovic, grinding out a 3-6 7-5 7-6 (7-3) success.

Fifth seed Katerina Siniakova was on court for just 48 minutes, leading Anastasia Potapova 6-0 3-0 when the Russian qualifier retired.

It was one of two retirements with Zhu Lin also departing while trailing 7-6 (7-5) 4-0 to Alize Cornet.

Jessica Pegula outclassed Camila Giorgi 6-2 6-2 to win a first WTA Tour title at the Citi Open.

The unseeded American was in fine form on a stuffy day in Washington, saving the only break point she faced in the entire match against Giorgi.

Pegula had earned a comeback win over Iga Swiatek and ousted Anna Kalinskaya in a three-set semi-final win.

On this occasion, it took just 59 minutes for Pegula, whose parents own Buffalo franchises the Bills and the Sabres, to secure the home triumph.

Pegula - who was joined on court by her pet dog during the trophy presentation - now holds a 3-1 head-to-head record over Giorgi and goes one better than her losing effort in the Quebec final last year.

Camila Giorgi booked her spot in the WTA Citi Open final after overcoming American wildcard Caty McNally in straight sets on Saturday.

Italian Giorgi moved through to her seventh WTA final courtesy of a 7-6 (7-5) 6-2 victory in Washington.

McNally had impressed in the American capital this week, 17-year-old upstaging fourth seed Hsieh Su-wei in the quarter-final for her first career top-50 win.

However, McNally was no match for Giorgi – who hit three aces and was only broken once throughout the straight-sets triumph.

Standing in the way of Giorgi and a third WTA crown is Jessica Pegula after the unseeded American outlasted Anna Kalinskaya 6-3 1-6 6-1.

While McNally failed to make it through to the singles showpiece, she teamed up with teenage sensation Coco Gauff to claim the doubles title.

Gauff announced herself on the WTA Tour at Wimbledon, where the 15-year-old stunned Venus Williams en route to the fourth round.

The American prodigy and McNally united for glory on Saturday, with the unseeded pair shocking fourth seeds Maria Sanchez and Fanny Stollar 6-2 6-2.

Camila Giorgi charged into the Citi Open semi-finals as Hsieh Su-wei became the final seed to fall on Friday.

Giorgi has put together a fine run in Washington and the Italian brushed past Zarina Diyas 6-3 6-2 in their quarter-final at the WTA International event.

The 27-year-old is into her first semi-final of the year after needing just 72 minutes to dispose of Diyas.

Awaiting Giorgi in the last four is American wildcard Caty McNally, who upset fourth seed Hsieh.

Hsieh, the last seed standing at the tournament, was well beaten by the 17-year-old, who claimed a 6-4 6-3 victory.

The other semi-final will be between qualifier Anna Kalinskaya and Jessica Pegula.

Kalinskaya overcame Kristina Mladenovic 6-4 4-6 6-2 and Pegula edged Lauren Davis 6-2 7-6 (7-2).

Unseeded Kazakh Zarina Diyas caused an upset at the Citi Open, shocking Lesia Tsurenko for a place in the quarter-finals.

After eliminating Wimbledon sensation Coco Gauff in the round of 32, Diyas upstaged fifth seed Tsurenko 6-4 6-4 on Thursday.

Diyas broke Tsurenko five times throughout the one hour, 53-minute contest in Washington, where both players required medical timeouts in muggy conditions.

Diyas – who lost to Tsurenko in Eastbourne in June – will next face Camila Giorgi for a spot in the semi-finals of the WTA International event.

Giorgi dropped the first set, but the Italian rallied as she overcame Rebecca Peterson 3-6 6-3 6-4.

Fourth seed Hsieh Su-wei recovered from a slow start to beat Varvara Gracheva 7-5 4-6 7-6 (8-6) in Thursday's final match.

Hsieh trailed 5-2 in the opening set but she reeled off five consecutive games to move ahead in the match before Gracheva levelled it up. However, the former was not to be denied in a third-set tie-break.

Awaiting Hsieh is American wildcard Caty McNally, who prevailed 6-3 1-6 6-3 against Christina McHale.

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