Melbourne, Australia – No. 2 seed Petra Kvitova reached the set win Monday over Ana Ivanovic.
Kvitova, the 21-year-old Czech who beat Maria Sharapova to win Wimbledon last season, came through in a second-set tiebreaker to down the 21st-seeded Ivanovic 6-2, 7-6 (7-2).
The match, at Rod Laver Arena, lasted 85 minutes -- 54 of them for the second set.
Kvitova fired seven aces and hit 30 winners, converting three of her six break points, and moved on to face the winner of a fourth round match Monday between Sara Errani and Zheng Jie.
Sharapova, the fourth seed, was also in action Monday against 14th-seeded Sabine Lisicki and 12th-seeded Serena Williams was to play Ekaterina Makarova.