Flushing Meadows, NY (My Sportsbook) - Top-seeded Caroline Wozniacki and former world No. 1 Jelena Jankovic were a pair of second-round winners Thursday at the 2010 U.S. Open.

The 2009 runner-up Wozniacki double-bageled Taipei's Kai-Chen Chang 6-0, 6-0 in a mere 47 minutes at Ashe Stadium.

Wozniacki lost to former world No. 1 Kim Clijsters in last year's U.S. Open finale.

The second-ranked 20-year-old Wozniacki became the top seed here when world No. 1 superstar Serena Williams pulled out last week, citing a foot surgery.

"It's nice to be the No. 1 seed, and, you know, it's nice to play at the big stadium," Wozniacki said. "It's a great atmosphere. I'm just happy to be through to the third round."

Wozniacki's third-round opponent will be another player from Chinese Taipei, Yung-Jan Chan.

The fourth-seeded Serbian Jankovic snuck past Croat Mirjana Lucic 6-4, 3-6, 6-2 on Day 4. Jankovic needed just over two hours to hold off the game Lucic. The sloppy match featured 19 double faults and 16 service breaks, including nine by the winner.

"I'm just glad I was able to get through, and it was another tough match for me today, Jankovic said. "I had a really tough opponent. She played really well and she was hitting those balls really hard. Really gave me a hard time. So either way, I'm just happy that I was able to win. That's the most important thing. You know, I give myself another chance."

Jankovic was the 2008 U.S. Open runner-up to Williams.

Russian former world No. 1 Maria Sharapova had little trouble in dispatching Czech Iveta Benesova 6-1, 6-2 in a little over an hour. Seeded 14th on the fortnight, the three-time major champion and 2006 winner here will next match up with 18-year-old American Beatrice Capra, who upended 18th-seeded Frenchwoman Aravane Rezai 7-5, 2-6, 6-3.

Seventh-seeded Wimbledon runner-up Vera Zvonareva and 11th-seeded former U.S. Open titlist Svetlana Kuznetsova were a pair of seeded Russian victors on another extremely hot day at the USTA Billie Jean King National Tennis Center. Zvonareva got past big-serving German Sabine Lisicki, 6-1, 7-6 (7-5), while the two-time major champion Kuznetsova continued her recent resurgence with a 6-2, 6-3 spanking of Latvian Anastasija Sevastova. Kuznetsova captured the year's final Grand Slam event back in 2004 and was the runner-up here in 2007. Zvonareva lost to the mighty Williams in July's Wimbledon finale.

The nightcap saw the No. 9 seed, Poland's Agnieszka Radwanska, ousted by Chinese Peng Shuai, 2-6, 6-1, 6-4. Radwanska became the second-highest seed to fall following eighth-seeded Li Na's first-round dismissal.

Belgian slugger Yanina Wickmayer, the 15th seed here, handled German Julia Goerges, 6-4, 7-5 to improve to 7-1 in her last eight matches in Flushing. Wickmayer was a surprise semifinalist a year ago.

In another upset, Swiss veteran Patty Schnyder topped 22nd-seeded Spaniard Maria Jose Martinez Sanchez 7-6 (7-2), 6-4. Russian Maria Kirilenko, seeded 23rd, rallied for a 4-6, 7-5, 6-0 win versus Austrian Yvonne Meusburger, Romanian 25th seed, Alexandra Dulgheru, came away with a 7-6 (7-5), 6-1 triumph over Swede Sofia Arvidsson and Estonia's Kaia Kanepi downed Uzbek Akgul Amanmuradova 6-2, 6-4 as the 31st seed moved on.

Additional second-round wins came for Spaniard Lourdes Dominguez Lino, Slovakian Dominika Cibulkova, German Andrea Petkovic and the aforementioned Chan.