Petra Kvitova stays on track for third title at Wimbledon

Two-time Wimbledon champion Petra Kvitova stayed on track for a third title by beating Serbian qualifier Natalija Stevanovic 6-3, 7-5 to move into the Round of 16 on Saturday. The ninth seed, who warmed up for Wimbledon by winning the WTA tournament on grass in Berlin last month, swapped early breaks with Stevanovic but broke again to love in the sixth game, which proved decisive. She has now won eight matches in succession.