Wimbledon champ Kvitova into Australian 4th round MELBOURNE, Australia (AP) -Wimbledon champion Petra Kvitova has advanced to the fourth round of the Australian Open after her opponent, Maria Kirilenko, retired in the second set of their match Saturday with a left thigh injury. Kvitova led 6-0, 1-0 when the Russian player decided she could not continue. She had received treatment from trainers at Rod Laver Arena near the end of the opening set. The second-seeded Kvitova will next play the winner of Saturday's later third-round match between former French Open champion Ana Ivanovic and American Vania King.