Summary Radwanska earned a measure of revenge after she was eliminated by Errani in the French Open.
TORONTO (AP) - Top-seeded Serena Williams eased into the Rogers Cup semifinals by overpowering Slovakia s Magdalena Rybarikova 6-1, 6-1 on Friday.
Williams, coming off a seventh tournament victory of the last month in the Swedish Open, had seven aces and finished off Rybarikova in just 60 minutes.
"I m definitely feeling pretty good, playing much better than I have the past month I would say," Williams said. "I m glad I m getting back to the feeling and getting into some rhythm."
The two-time Rogers Cup champion will face third-seeded Agnieszka Radwanska of Poland, a 7-6 (1), 7-5 winner over fifth-seeded Sara Errani of Italy.
"It s a good matchup," Williams said. "She does everything so well. She s playing better too actually so she s having a much better year. It s definitely not going to be easy. I can only hope that I play well and I can only hope that I come out on top."
In the other quarterfinals, fourth-seeded Li Na of China beat Slovakia s Dominika Cibulkova 7-6 (1), 6-2; and Romania s Sorana Cirstea upset sixth-seeded defending champion Petra Kvitova of the Czech Republic 4-6, 7-5, 6-2.
Radwanska earned a measure of revenge after she was eliminated by Errani in the French Open quarterfinals.
Radwanska and Errani traded breaks virtually the entire first set before Radwanska took the tiebreaker after a smooth volley drop and wide return from Errani on set point. The two players again traded breaks in the second set until
Radwanska held serve at 6-5 when Errani returned long on double match point.
Radwanska closed it out in just over two hours, avoiding any repeat of their 2012 meeting at the WTA Championship
an epic 3½-hour, three-set victory for Radwanska.
Cirstea knocked off former top-ranked players Jelena Jankovic and Caroline Wozniacki to reach the quarterfinals.
"It s probably (my) best tournament in a long, long time," Cirstea said. "It might come as a surprise to many people ... I don t think for me and my team it s such a big surprise because we have been working consistently on things."
Kvitova double-faulted 10 times, her ninth coming on a break point for Cirstea to open the third set 1-0.
"The beginning of the second set I started to feel a little bit low of the energy," Kvitova said. "The serve was really bad after this, and I didn t find energy from my legs."
Li, a finalist last year, needed 96 minutes to get past Cibulkova, who came into the tournament on a roll with a recent title victory over Radwanska in Stanford, California.
Li broke to make it 6-5 in the first set, taking the game with a cross-court winner, but couldn t hold and needed a tiebreaker to win the set. She cruised through the second set en route to her first semifinal berth since losing at Stuttgart in April.
