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