World No. 1 Serena Williams eased into the next round in straight sets while stomach problems sent Wimbledon champion Marion Bartoli crashing out of the WTA Rogers Cup on Thursday.
Two-time champ Williams avenged an earlier loss by her sister, Venus, to Kirsten Flipkens by beating the Belgian 6-0, 6-3 in a third round match in the $2.4 million tournament at Rexall Centre arena.
Flipkens, a surprise semi-finalist at Wimbledon, ousted Venus Williams 0-6, 6-4, 6-2 in the first round.
Williams, the reigning US Open and French Open champ, won this tournament in 2001 and 2011 and was the runner-up in 2000.
Williams moves on to the quarter-finals where she next faces Slovak Magdalena Rybarikova.
French star Bartoli was upset by seventh seeded Rybarikova 7-6 (7/5), 1-0. Bartoli retired with abdominal pain after losing the first game of the second set.
Last week Rybarikova captured her second consecutive Washington, D.C. crown.
Also, third-seeded Agnieszka Radwanska dispatched 14th-seeded American Sloane Stephens 6-1, 7-6 (7-2) and fourth-seeded Chinese star Li Na rallied to beat former world No. 1 Ana Ivanovic 3-6, 6-1, 7-6 (7/5).
Ex-French Open champ Li lost to Czech left-hander Petra Kvitova in last year’s Rogers Cup final. Kvitova was scheduled to take the court laster Thursday against Aussie Samantha Stosur.
Fifth-seeded Italian Sara Errani outlasted France’s Alize Cornet 7-5, 7-6 (7/3). Errani will meet 2012 Wimbledon runner-up Radwanska in the round of the eight.
Romanian Sorana Cirstea surprised 15th-seeded Serb Jelena Jankovic 6-3, 6-4.
Williams rolls, Bartoli pulls out in Toronto
