Summary:
A world number one has reached the third round of the Australian Open with a 6-4 6-2 victory over a German.

Full article:
Wimbledon champion Petra Kvitova continued to make amends for an upset first-round loss last year at the Australian Open with a 6-2, 6-4 second-round win  over Mona Barthel. Fourth-seeded Kvitova held her serve in the sixth game of the second set through nine deuces, then broke Barthel in the ninth, helped when the German player served a double-fault on break point. Kvitova, who won her second Wimbledon title last July, next plays American Madison Keys, who beat Casey Dellacqua in three sets. Wimbledon champion Petra Kvitova defeated Mona Barthel in straight sets to reach the third round . Kvitova held her serve in the sixth game of the second set and then broke Barthel in the ninth game . Barthel of Germany served a double-fault on break point as Kvitova progressed without dropping a set . The 24-year-old has not dropped a set, having eased into the second round after defeating Holland's Richel Hogenkamp in her opening game. Last year, Thailand's Luksika Kumkhum, playing just her second grand slam tournament, upset Kvitova in the first round at Melbourne Park.