Defending champion Serena Williams revived memories of last year's stunning Australian Open win Sunday when she overpowered Czech 12th seed Nicole Vaidišová to reach the quarter-finals. Williams ended the 18-year-old's Open campaign with a 6-3, 6-4 win to set up a meeting with either third seed Jelena Jankovic of Serbia or Australian hope Casey Dellacqua. Vaidišová committed 25 unforced errors, more than doubling Williams' tally, admitting her opponent's on-court dominance unsettled her. "I had my chances, especially in the second set but didn't chose the right shot, maybe went for too much," the 18-year-old said.
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