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One surprise Wednesday: American wild card Mallory Burdette is through to the third round in her Grand Slam debut.

The 252nd-ranked Stanford All-American beat No. 69 Lucie Hradecka 6-2, 6-4. A 21-year-old from Georgia, Burdette was this year’s NCAA singles runner-up to teammate Nicole Gibbs.

She figured that loss cost her the only chance of making the Open, but she got in as the American woman who earned the most points on the USTA Pro Circuit this summer. Now her next opponent could be Maria Sharapova.

“To end up here at the US Open was a huge surprise,” she said. “I never expected that at the beginning of the summer.”

In other women’s second-round matches, fifth-seeded Petra Kvitova swept Alize Cornet 6-4, 6-3, 15th-seeded Lucie Safarova beat Aleksandra Wozniak 6-3, 4-6, 6-2, and 19th-seeded Nadia Petrova defeated Simona Halep 6-1, 6-1.

American Varvara Lepchenko, seeded 31st, advanced with a 6-2, 6-2 win over Anastasia Rodionova.

In a men’s first-round match, Brian Baker of the U.S. continued his strong 2012, defeating Jan Hajek 6-3, 6-4, 6-2. Eighth-seeded Janko Tipsarevic rallied from down two sets to beat 129th-ranked Guillaume Rufin 4-6, 3-6, 6-2, 6-3, 6-2 in 3 hours, 37 minutes.

Other top players on the court later Wednesday include the third-seeded Sharapova and Andy Murray, along with three-time champ Kim Clijsters.