Australian Open 2015: Serena and Venus Williams advance to 3rd round

Melbourne, Australia: The Williams sisters have advanced to the third round at the Australian Open, with top-ranked Serena fending off set points before going on a 10-game roll to beat Vera Zvonareva 7-5, 6-0 and Venus beating fellow American Lauren Davis in straight sets.

Serena 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 the match.

She said Zvonareva, a two-time Grand Slam finalist who played only five tournaments in 2014, started out aggressive "and I was a little too passive."

That's when she told herself: "'You know Serena, you've done so well here, you have nothing to lose' — and I started playing a little better."

After breaking Williams' serve twice in the first set, Zvonareva only won eight points in the second set and didn't get close to another break-point chance.

Venus Williams, who had a 6-2, 6-3 win over Davis, hasn't been beyond the third round at a major since reaching the fourth round at Wimbledon on 2011.

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.

No. 24 Garbine Muguruza beat veteran Daniela Hantuchova 6-1, 1-6, 6-0.

On the men's side, U.S. Open finalist Kei Nishikori beat Ivan Dodig 4-6, 7-5, 6-2, 7-6 (0), getting a crucial service break in the 10th game of the fourth set when Dodig was serving for the set and then dominating in the tiebreaker.

No. 12 Feliciano Lopez was leading 4-6, 4-6, 7-6 (3), 4-0 when Adrian Mannarino retired from their second-round match and No. 19 John Isner beat Andreas Haider-Maurer 6-4, 7-6 (4), 4-6, 6-4.

Steve Johnson ousted No. 30 Santiago Giraldo 6-3, 6-4, 6-2.