Reigning Wimbledon champion Garbine Muguruza reached the quarter-finals of the Stanford Classic with an easy 60-minute 6-2 6-0 run past American teenager Kayla Day while Maria Sharapova cited a sore arm in her latest withdrawal from an event.
“Kayla has just won the US Open in juniors and she’s just very promising, so I knew I had to be concentrated today,” Muguruza, the top seed said after her victory over the 17-year-old.
Muguruza next faces No. 5 seed Ana Konjuh, a 7-5 6-5 winner over Russia’s Natalia Vikhlyantseva.
Meanwhile news that the five-time major champion Maria Sharapova had withdrawn with a sore left arm, filtered through.
The Russian, who was competing as a wildcard in her fourth tournament back after a 15-month doping ban, said she started to feel pain in her forearm late during her first-round win on Monday over American Jennifer Brady.
“After yesterday’s scan, the doctor has recommended I don’t risk further injury,” Sharapova said in a statement on the tournament’s website.
“Monday night’s crowd was so special and I wish I could continue playing but I have to make a preventative decision.”
Her early exit means Ukrainian seventh seed Lesia Tsurenko advances to the third round with a walkover, where Madison Keys, the third seed who beat Caroline Dolehide 3-6 6-2 6-3, awaits.