TORONTO -- Top-seeded Serena Williams advanced to the Rogers Cup quarterfinals Thursday, beating 13th-seeded Kirsten Flipkens of Belgium 6-0, 6-3. Andre Roberson Jersey . Williams, coming off a tournament victory 2 1/2 weeks ago in the Swedish Open, set up a match Friday against Slovakias Magdalena Rybarikova. "She wasnt able to play her game as much as she wanted to," Williams said. "When you play such a high-ranked player, you have to go in there with the mindset of do the best you can before they can step all over you." Wimbledon champion Marion Bartoli retired because of an abdominal injury early in the second set of her match against Rybarikova. "Kind of excess of tiredness and exhaustion on my body," Bartoli said. "The pain is so large and we cant really say right now exactly (if) there is a tear at some point or if its just like a huge tightness." Rybarikova led 7-6 (5), 1-0 when the seventh-seeded Bartoli stopped playing. Playing her first event since returning from a hamstring injury that sidelined her since her major victory in London, Bartoli was in obvious discomfort as she walked to the player bench area, where she had a trainer stretch her arm and leg. "Everything that happened for me since a month (ago), its not without any tiredness," Bartoli said. "It took me so much energy to win my first Grand Slam that at some point I will have a kind of low and its normal. Im human. At the end of the day I cant be winning after winning after winning without feeling at some point a kind of exhaustion." Earlier, fourth-seeded Li Na of China fought back from a three-game deficit in the final set for a 3-6, 6-1, 7-6 (5) victory over Serbias Ana Ivanovic. Third-seeded Agnieszka Radwanska of Poland also advanced to the quarterfinals, beating American Sloane Stephens 6-1, 7-6 (2). Fifth-seeded Sara Errani of Italy beat Alize Cornet of France 7-5, 7-6 (3); and Romanias Sorana Cirstea edged Serbias Jelena Jankovic 6-3, 6-4. In late matches, sixth-seeded Petra Kvitova of the Czech Republic beat 12th-seeded Samantha Stosur of Australia 6-3, 6-3; and Slovakias Dominika Cibulkova topped 10th-seeded Roberta Vinci of Italy 6-3, 7-6 (4). Ray Allen Jersey . He was followed closely by David Clarkson, donning red, seconds later. Clarksons actions one night earlier, leaping off the bench in defence of Kessel during a pre-season game against the Buffalo Sabres, will cost him the first 10 games of the regular season. Detlef Schrempf Jersey . Peter Gammons, an analyst for Major League Baseballs network and website, drew the ire of hockey fans on Sunday when he criticized the two NHL teams on Twitter for their physical game the night before. http://www.shopthunderstore.com/Cheap-Ke...Thunder-Jersey/ . Tomas Berdych and Radek Stepanek defeated Nenad Zimonjic and Ilija Bozoljac 6-2, 6-4, 7-6 (4) on the indoor hard-court at Belgrade Arena. The victory improved the Czech pairs impressive cup doubles record to 14-1. Darren Lockyer has put a line through Canterburys as an NRL title threat, declaring the Bulldogs are not ruthless enough.In analysis sure to fire up coach Des Hasler and his troops, Lockyer said the Bulldogs had not been consistent enough to be considered premiership contenders.Despite being in top four contention after six wins from their past seven starts, Lockyer said Canterbury hadnt exhibited the kind of form that warranted them to be considered a threat to North Queensland, Melbourne, Cronulla and Canberra.I dont think theyre consistent enough, theres not enough discipline in their performance, Lockyer told the Nine Networks Sunday Footy Show.Theyre just in and out, in and out over the 80 minutes and youre not going to win premierships playing that style of football.The Bulldogs have looked shaky over the past three weeks, smashed 36-0 by the Cowboys and unconvincing in wins over struggling St George Illawarra and last-placed Newcastle.Lockyer questioned their inability to put away the Dragons and Knights earlier, saying they neededd to discover their killer instinct. Gary Payton Jersey. Youve got to be ruthless, Lockyer said.Theyve done well to get into the top four but if they dont get their discipline right, I cant see them going all the way.The Bulldogs begin their run home against Manly at ANZ Stadium on Thursday night before facing Brisbane (away), Cowboys (home) and South Sydney (home).Sydney Roosters great Brad Fittler described the Bulldogs as winning ugly and said they were getting home on the back of some individual brilliance, but warned they wouldnt be able to get away with that in September.You watch them sometimes and you just shake your head and you wonder how they keep winning, Fittler said.They beat the Dragons last week 13-10, they just found enough to beat them.But Ive got to say that with Sam Kasiano in their team, he can just do some wonderful things and theres enough quality there - Brett Morris back with his brother Josh. 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