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Serena rolls; Fish withdraws

NEW YORK — Serena Williams didn't drop a game in advancing to the quarterfinals of the U.S. Open.

Roger Federer moved on with even less work when Mardy Fish pulled out of their fourth-round match Monday for precautionary reasons.

Fish missed about two months this season because of an accelerated heartbeat and had a medical procedure in May. His agent, John Tobias, said "we are not 100 percent sure what the issue is and if it is related to his previous issues."

"I was reluctant to do so, but am following medical advisement," Fish said about his withdrawal in a statement. "I had a good summer and look forward to resuming my tournament schedule in the fall."

The 30-year-old American's third-round match against Gilles Simon went five sets, lasting more than 3 hours and ending after 1 a.m. Sunday. Afterward, the 23rd-seeded Fish did not appear at a news conference. Tournament officials said he was getting treatment, but didn't give specifics.

"I am really sorry for Mardy. I just want to wish him a speedy recovery," Federer said in a statement.

Williams beat 82nd-ranked Andrea Hlavackova, 6-0, 6-0, in 57 minutes. It was the first time in 62 career victories at Flushing Meadows that the three-time U.S. Open champion enjoyed a "double bagel."

"She was fighting really hard," Williams said. "You give people any type of chance, especially in tennis, the match is never over until you shake hands. There is always a comeback available."

Williams had 31 winners and just seven unforced errors. She and sister Venus play doubles during Monday's night session in Arthur Ashe Stadium.

Hlavackova, a 2011 French Open doubles champion, had never been past the second round in singles at a major tournament before this year.

Williams will next face Ana Ivanovic, who is finally back in a Grand Slam quarterfinal more than four years after her French Open title.

The 12th-seeded Serb beat Tsvetana Pironkova, 6-0, 6-4. Ranked No. 1 in the world in 2008, Ivanovic has struggled with injuries and her confidence since.

After failing to serve out the match at 5-3 in the second set, Ivanovic broke the 55th-ranked Bulgarian at love in the next game to clinch the victory.

Italian doubles partners Sara Errani and Roberta Vinci each won to set up a meeting in the quarterfinals. Vinci upset second-seeded Agnieszka Radwanska, 6-1, 6-4.

Federer, in his 34th consecutive quarterfinal at a major tournament, will meet sixth-seeded Tomas Berdych, who defeated 11th-seeded Nicolas Almagro, 7-6 (4), 6-4, 6-1.