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Garbine Muguruza of Spain returns a shot to Kayla Day of the United States during Day 3 of the Bank of the West Classic at Stanford University Taube Family Tennis Stadium on August 2, 2017 in Stanford, California. Image Credit: AFP

Los Angeles: Wimbledon champion Garbine Muguruza dropped just two games in her first match since last month’s All-England Club triumph as she powered past American Kayla Day at the Stanford Classic on Wednesday.

The Spaniard, who was taken to three sets by the 17-year-old Day at Indian Wells in March, was a decisive 6-2 6-0 winner at the Taube Family Tennis Stadium at Stanford University, needing less than an hour to book her place in the quarter-finals.

“I think I learnt a lot from that match (at Indian Wells),” Muguruza said in an on-court interview. “I knew that it was going to be difficult, so I really trained hard and prepared.” Muguruza used a big serve to set up her booming forehand and took full advantage of Day’s vulnerable second serve. The top-seeded Spaniard will next face fifth seed Ana Konjuh of Croatia, who battled past Russia’s Natalia Vikhlyantseva 7-5 6-4.

The 23-year-old said she was doing her best to put the elation of Wimbledon behind her and focus on the hardcourt season.

“I’m just working on trying to forget what happened and just starting Stanford. Stanford is my goal and that’s it,” she told reporters.

American third seed Madison Keys survived a surprisingly stern test from teenage compatriot Caroline Dolehide to reach the last eight, rallying from a set down for a 3-6 6-2 6-3 win.

“I think I finally just took a big deep breath, and restarted the match and settled in a lot more,” Keys said after overhauling the 212th-ranked 18-year-old qualifier.

“I wasn’t playing great and I turned it around. Things are starting to look up and I’m really happy about that.” The victory set up a quarter-final meeting with seventh seed Lesia Tsurenko of Ukraine, who advanced without hitting a ball when high-profile Russian wild card Maria Sharapova withdrew due to an arm injury.

“We’re sad to announce that @mariasharapova has withdrawn after doctor’s advice regarding her left arm,” a post on the tournament’s Twitter feed said.

Sharapova played her first US match in more than two years on Monday, defeating American Jennifer Brady 6-1, 4-6, 6-0 in an opening-round match at the hardcourt event in Stanford.

“Toward the end of the Monday night’s match, I felt pain in my left forearm,” Sharapova said in a statement Wednesday. “After yesterday’s scan, the doctor has recommended I don’t risk further injury.”

The former world number one from Russia hadn’t played in the US since March of 2015, before serving a 15-month doping suspension for the use of meldonium.

“Unfortunately, I have to withdraw from today’s match,” Sharapova said. “Monday night’s crowd was so special and I wish I could continue playing but I have to make a preventive decision.”

Sharapova told supporters after her Monday match that her cheers meant a great deal to her.

“I feel like I just want to hug everyone and say thank you,” Sharapova said Monday. “It’s my first match in the States in a really long time, and it’s the closest thing to home for me.”

The latest injury brings into question whether or not Sharapova will be fit in time for the US Open, which starts August 28, as well as for another key tune-up event in Cincinnati in two weeks for which Sharapova has also accepted a wildcard.

Sharapova, 30, returned to competition in April, but her comeback was disrupted by a hip injury that forced her to withdraw from Wimbledon qualifying.

Sharapova’s ranking has fallen to 171 in the world.

“I feel like I’m playing catch-up against everyone who has had a head start,” Sharapova said after her match. “All that matters is that I keep playing.”