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On the women’s side, No. 2 Petra Kvitova scraped into the third round with a nervous 6-2, 2-6, 6-4 win over Carla Suarez Navarro.

Kvitova, who lost in the first round at the U.S. Open in the first major after winning Wimbledon, lost the second set and was down a break in the third before recovering to beat the Spaniard.

“In the beginning it was OK but I made many, many, many mistakes,” Kvitova said of her 48 unforced errors. “It’s part of my game but it’s too many. It was very tough to get back in the third set.”

Maria Sharapova, one of the three former champions in the women’s draw, reached the third round after just two hours on court in two matches.

The 2008 champion had a 6-0, 6-1 second-round win over U.S. qualifier Jamie Hampton in 64 minutes.

Sharapova did not play in any warmup events and spent nearly two weeks in Melbourne ahead of the season’s first major while she rested an injured left ankle.

“It was more about getting my feet going … worrying about myself,” Sharapova said. “Yeah, started my preparations in the offseason a little late, took a bit of extra time in practice instead of rushing into a tournament.”

She’ll meet No. 30 Angelique Kerber, who beat Canada’s Stephanie Dubois 7-5, 6-1.

Seventh-seeded Vera Zvonareva, a two-time semifinalist at Melbourne Park, had a 6-1, 7-6 (3) over Lucie Hradecka . No. 21 Ana Ivanovic also advanced, beating Dutch player Michaella Krajicek 6-2, 6-3.

Three seeded players were ousted, with China’s Zheng Jie beating No. 23 Roberta Vinci, Sara Errani beating No. 29 Nadia Petrova, No. 25 Kaia Kanepi losing to Ekaterina Makarova.

Defending champion Kim Clijsters is on the other half of the draw and advanced to the third round on Wednesday along with top-ranked Caroline Wozniacki, No. 3 Victoria Azarenka and former No. 1-ranked Jelena Jankovic.

Clijsters will next face longtime friend Daniela Hantuchova in the third round, and a win there could set up a fourth-round match against French Open champion Li Na, a rematch of the 2011 Australian final.

On the bottom half of the men’s draw, No. 2 Rafael Nadal advanced without much trouble from his injured right knee or from German veteran Tommy Haas in a 6-4, 6-3, 6-4 win. Four-time champion Roger Federer didn’t even need to pick up a racket because Andreas Beck withdrew from their second-round match.