Maria Sharapova, based on doctor’s advice, has withdrawn from the Bank of the West Classic on Wednesday due to soreness in her left arm.
“Unfortunately, I have to withdraw from today's match,” said Sharapova. “Toward the end of the Monday night’s match, I felt pain in my left forearm. After yesterday's scan, the doctor has recommended I don't risk further injury. Monday night’s crowd was so special and I wish I could continue playing but I have to make a preventative decision.”
No. 7 seed Lesia Tsurenko advances to the quarterfinals by walkover and will play third-seeded Madison Keys.
Top-seeded Garbine Muguruza took care of American Kayla Day, 6-2, 6-0, in a match that lasted just over an hour.
"I felt good. I remembered a match I had against her and it was a tough match," the fourth-ranked Muguruza said. "It's never easy and I remembered that so I concentrated on not letting her play her best tennis."
Day, ranked 175th at the time, gave then No. 7 Muguruza fits at Indian Wells, taking the first set and and pushing Muguruza to the limit before falling, 3-6, 7-5, 6-2.
"She's a lefty and has a very difficult serve to return," Muguruza said. "I worked on that."
The doubles match between Stanford grads Kristie Ahn and Nicole Gibbs and the third-seeded duo of Abigail Spears and CoCo Vandeweghe was moved to Stadium Court.
Spears and Vandeweghe managed to outlast Gibbs and Ahn, 6-7 (7), 6-4, 10-6.
“This is definitely tough for Maria,” said Bank of the West Classic Tournament Director Vickie Gunnarsson. “She has so many fans which was evident by the support she received here on Monday night. We wish her a speedy recovery and hope to see her back on the court soon.”
Keys ended Caroline Dolehide's run in the singles tournament, 3-6, 6-2, 6-3. Dolehide won twice in the qualifying tournament and then beat Japan's Naomi Osaka to reach the second round.
Seventh-seeded Ana Konjuh of Croatia advanced with a 7-5, 6-4 victory over Russia's Natalia Vikhlyantseva.
Konjuh meets Muguruza in the quarterfinals.
"I have seen her around at tournaments but I have never actually played her," Muguruza said. "I've practiced with her and I know she has some great results. I'm trying to work hard and not take anything for granted."
In other doubles, the team of Poland's Alicija Rosolska and France's Alize Cornet topped the team of Ukraine's Kateryna Bondarenko and Australia's Arina Rodionova, 2-6, 6-1, 12-10.
Jacqueline Cato and Nicola Geuer ended the night with a 6-1, 6-2 victory over Natalia Vikhlyantseva and Jovana Jaksic.