US Open 2019: Petra Kvitova knocked out in second round by Andrea Petkovic

Petra Kvitova
Petra Kvitova's best US Open performances have been two quarter-final appearances in 15 attempts
US Open 2019
Venue: Flushing Meadows, New York Dates: 26 Aug - 8 Sep
Coverage: Live text and BBC Radio 5 Live Sports Extra commentary on selected matches on the BBC Sport website and app. Click here for Live Guide.

Czech sixth seed Petra Kvitova is out of the US Open after losing 6-4 6-4 to world number 88 Andrea Petkovic in the second round.

The two-time Wimbledon champion, who has been struggling with a forearm injury, was broken in the 10th game as the German, 31, took the opening set.

She was a break up in the second set before Petkovic broke twice more en route to sealing victory.

Japanese defending champion Naomi Osaka defeated Pole Magda Linette 6-2 6-4.

Linette, the world number 53, was 3-0 up in the second set before the world number one fought back.

Osaka will face promising 15-year-old Coco Gauff next, with the American beating Hungary's Timea Babos 6-2 4-6 6-4 in her second-round match on Louis Armstrong Stadium.

Petkovic will now play Belgian 25th seed Elise Mertens after knocking out Kvitova while ninth seed Aryna Sabalenka was another high-profile player to be eliminated on day four as she lost to Yulia Putintseva of Kazakhstan 6-3 7-6 (7-3).

Caroline Wozniacki, a finalist in 2009 and 2014 and seeded 19th, beat Danielle Collins 4-6 6-3 6-4 and will face 19-year-old Bianca Andreescu, seeded 15th, after the Canadian saw off Kirsten Flipkens 6-3 7-5.

Elsewhere, Ukrainian 32nd seed Dayana Yastremska beat Swede Rebecca Peterson 6-4 6-1 to set up a third-round meeting with compatriot and fifth seed Elina Svitolina.

Tunisia's Ons Jabeur, who knocked out 27th seed Caroline Garcia in round one, fought back from a set down to beat Belarus' Aliaksandra Sasnovich3-6 6-4 6-2.

It is the first time Jabeur has reached the third round of the US Open and she will play 2016 finalist and third seed Karolina Pliskova next.

Chinese Taipei's Hsieh Su-Wei, the 29th seed, lost in a third-set tie-break as Karolina Muchova of the Czech Republic won 6-1 4-6 7-6 (7-2). She will play seven-time champion Serena Williams in the third round.

Greece's Maria Sakkari lost the first set against China's Peng Shuai before triumphing 6-7 (5-7) 6-4 6-2. The 30th seed will now take on world number two Ashleigh Barty, the French Open champion.

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