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Wozniacki, Kerber both upset in Wuhan Open

WUHAN, China -- Caroline Wozniacki, Angelique Kerber and Anastasija Sevastova all fell to unseeded opponents in the first round of the Wuhan Open on Monday.

Two-time champion Petra Kvitova avoided an upset, though, beating Polona Hercog 7-6 (6), 6-3 in a second-round match.

The 13th-seeded Wozniacki lost to Su-Wei Hsieh of Taiwan 6-7 (2), 6-1, 6-2. Hsieh lost the first-set tiebreaker but hit her stride in the second and third sets, cruising to a comfortable win over the former world No. 1.

"The first set was not easy, because I just came from Osaka,'' Hsieh said. "When I came on the court ... I was a little bit lost, and she was playing good as well. I asked my coach to come on the court and I said, 'OK, I don't feel anything. I feel weird.' And he said, 'It's OK, just try to play,' and I did. I tried to keep playing and after a couple of games, it was going better and better.''

Hsieh broke Wozniacki's serve six times and saved eight of 10 break points. Wozniacki is 16-14 on the year.

Puerto Rico's Monica Puig defeated the 11th-seeded Kerber 7-6 (5), 5-7, 6-1 in almost three hours.

After failing to convert two match points and dropping the second set, Puig regained her form in the third to oust the three-time Grand Slam winner.

Puig now has a 3-3 lifetime record against Kerber, including a win in the final of the 2016 Rio de Janeiro Olympics.

"We've had so many great matches in the past,'' Puig said. "I have a lot of respect for her. I know it's not over until you go and shake her hand.''

American Christina McHale ousted No. 14 seed Sevastova 4-6, 6-3, 6-3 to advance to the round of 32.

Defending champion Aryna Sabalenka easily reached the third round, beating American Danielle Collins 6-1, 6-0 in the late match.