BEIJING — Peng Shuai produced the upset of the first round in the China Open on Monday, beating sixth-seeded Venus Williams 7-5, 6-1.
The 30-year-old Chinese wild-card entry broke Williams’ serve twice in the second set.
In other matches, top-ranked Angelique Kerber defeated Katerina Siniakova 6-4, 6-4, No. 16 Elina Svitolina beat Tatjana Maria 6-2, 6-2, Daria Gavrilova beat Christina McHale 6-4, 6-4, and fifth-seeded Karolina Pliskova eliminated Lucie Safarova 6-7 (7), 6-1, 6-4.
Defending champion Garbine Muguruza, the French Open champion who is seeded second, beat Yulia Putintseva 6-2, 7-6 (5) in the second round.
“I’m very happy I could close the match in the tiebreak because obviously it was getting tougher and tougher,” Muguruza said. “Tiebreaks are moments where it’s delicate. You feel a bit more nervous and more tense.”
In the men’s first round, fifth-seeded David Ferrer beat Pablo Cuevas 6-4, 7-6 (3) and No. 7 Roberto Bautista Agut defeated Australian qualifier John Millman 6-4, 3-6, 6-3.
KEY BISCAYNE, Fla. (AP) Caroline Wozniacki has reached the quarterfinals of the Miami Open, advancing Monday when Garbine Muguruza retired after one set with a heat-related illness.
Wozniacki, the sixth seed, took that set over the 12th-seeded Muguruza 7-6.
Muguruza was tended to by doctors following that tiebreaker, which wrapped up a 70-minute set, and decided she could not continue on a 77-degree, humid afternoon.
Wozniacki still has not dropped a set in the tournament, and will face fourth-seeded Dominika Cibulkova or Lucie Safarova in the quarterfinals.
Earlier Monday, Karolina Pliskova also reached the quarterfinals, beating Czech Fed Cup teammate – and occasional doubles partner – Barbora Strycova 6-1, 6-4. Pliskova needed only 21 minutes to take the first set, winning 11 consecutive points in one stretch and 16 of 17 on her serve.
KEY BISCAYNE, Fla. (AP) Milos Raonic has pulled out of the Miami Open after aggravating a right hamstring injury that sidelined him for nearly a month.
The No. 3-seeded Raonic withdrew before Sunday’s match against American qualifier Jared Donaldson, who advanced to the fourth round.
Raonic said his injury became progressively worse after his opening match, his first since Feb. 25. He expects to be sidelined at least two weeks and perhaps longer.
The Canadian said he hasn’t made it through an entire tournament healthy since Wimbledon last July.