Serena Williams wins in Rome
ROME -- Serena Williams rallied past Nadia Petrova of Russia 4-6, 6-2, 6-3 to extend her winning streak to 15 matches in second-round action at the Italian Open on Wednesday.
Williams has won titles in Charleston, S.C., and Madrid -- plus two victories in Fed Cup.
Complete results
Need the scores from any match played in today's tournaments? Results
Serena's sister, Venus Williams, had an easier time reaching the third round, eliminating Ekaterina Makarova of Russia 7-6 (7), 6-1.
Considering all the tennis Serena Williams has played during her streak, she didn't have much time after finishing her first-round win over Galina Voskoboeva near midnight Tuesday.
"It wasn't that easy. It was a quick turnaround," Serena said. "When I saw the schedule, I said, 'Oh my God, are you serious?' That's life. You just have to be able to adjust and make the best of it, and so I was really happy to come through today."
However, Serena appeared to struggle with her back at times.
"Everyone has aches and pains here and there, and today I felt it a lot because I have been playing a lot and practicing even more," she said.
Williams next faces fifth-seeded Sam Stosur, who defeated Sara Errani 6-3, 7-5.
There were several upsets in women's play, with No. 3 Agnieszka Radwanska, No. 6 Caroline Wozniacki and No. 7 Marion Bartoli each losing.
Radwanska was beaten by 28th-ranked Petra Cetkovska of the Czech Republic 6-4, 4-6, 6-1; Wozniacki retired with upper respiratory illness while trailing 6-4, 4-0 to Anabel Medina Garrigues of Spain; and Bartoli was eliminated 6-3, 6-1 by Julia Goerges of Germany.
Also, French Open winner Li Na of China beat Iveta Benesova of the Czech Republic 6-1, 7-5; and 12th-seeded Angelique Kerber of Germany eliminated Vania King of the United States 6-3, 6-2.
Former French Open winner Ana Ivanovic routed Spanish qualifier Silvia Soler-Espinosa 6-2, 6-1 to set up a matchup with No. 2 Maria Sharapova.
Information from The Associated Press was used in this report.
SPONSORED HEADLINES
MORE TENNIS HEADLINES
- Canada teen Bouchard gains Strasbourg semis
- Querrey loses to Roger-Vasselin at Nice Open
- Qualifier Pella advances to Duesseldorf semis
- Del Potro, Fish, Baker out of French Open
MOST SENT STORIES ON ESPN.COM
EDITORS' PICKS

- Dirt Devil
- Maria Sharapova's determination has paid off in Paris. Tandon »

- Nothing To Prove
- Serena Williams' legacy is intact regardless of French Open. Story »

- Squashing Perfection
- The day Martina Navratilova lost at the French Open. Greg Garber »

- The Vulnerables
- Wawrinka, Isner among the vulnerables in Paris. Bryant »

- Familiar Picture
- Nothing new in Rafa's dominance over Federer. Bodo »