MELBOURNE, (AP):

Top-ranked, Serena Williams, fended off three set points before going on a 10-game roll to beat Vera Zvonareva 7-5, 6-0 and move into the third round of the Australian Open. Men's number one, Novak Djokovic, had an easier run, spending a minute less than Williams on Rod Laver Arena in his 84-minute, 6-0, 6-1, 6-4 win over No. 88-ranked Andrey Kuznetsov, yesterday.

Defending champion, Stan Wawrinka, who ended four-time champion Djokovic's 25-match winning streak at Melbourne Park in the quarterfinals last year, advanced to the third round for the seventh consecutive year with a 7-6 (4), 7-6 (4), 6-3 win over qualifier, Marius Copil.

Williams, seeking a sixth Australian and 19th Grand Slam title, saved three set points in the ninth game before holding to swing the momentum of her match against Zvonareva, a two-time Grand Slam finalist who played only five tournaments in 2014.

Williams will next play number 26, Elina Svitolina, who beat Nicole Gibbs 7-6 (3), 7-6 (6). Venus Williams had a 6-2, 6-3 win against fellow American Lauren Davis. The elder of the Williams sisters, a seven-time major winner, hasn't been beyond the third round at a major since reaching the fourth round at Wimbledon on 2011.

Wimbledon champion, Petra Kvitova, seeded four, beat Mona Barthel 6-2, 6-4 to move into a third-round match against Madison Keys, who rallied to beat No. 29 Casey Dellacqua 2-6, 6-1, 6-1.

Sixth-seeded Agnieszka Radwanska needed only 44 minutes to race through her 6-0, 6-1 win over Johanna Larsson, continuing her run of reaching the third round or better at every Australian Open since 2010. In the next round, she'll face, Varvara Lepchenko, a 6-1, 7-6 (1) winner over Ajla Tomljanovic.