PARIS -- Varvara Lepchenko of the United States reached the third round at a Grand Slam tournament for the first time, upsetting 19th-seeded Jelena Jankovic of Serbia 7-6 (4), 4-6, 6-4 at the French Open.
After the players shook hands at the end of the 3-hour, 6-minute match Thursday, Lepchenko leaned over the net and gave it a kiss. She is ranked 63rd and playing in her 15th major tournament.
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The 26-year-old Lepchenko was born in Uzbekistan but lives in Allentown, Pa., and competes for the U.S. Jankovic is a former No. 1-ranked player who was the runner-up at the 2008 U.S. Open and has been a French Open semifinalist three times.
Earlier Thursday, Wimbledon champion Petra Kvitova reached the third round by beating Urszula Radwanska of Poland 6-1, 6-3.
The fourth-seeded Czech was never really tested on Court Suzanne Lenglen, saving all three break points she faced.
Kvitova secured her first Grand Slam title at Wimbledon last year, and then won the WTA Championships. Although she has yet to win a title in 2012, she is seeded fourth in Paris and is expected to go deep into the tournament.
Radwanska is the younger sister of third-seeded Agnieszka Radwanska, who reached the third round on Wednesday by beating seven-time Grand Slam champion Venus Williams.
Caroline Wozniacki advanced to the third round by beating Jarmila Gajdosova of Australia 6-1, 6-4.
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The ninth-seeded Dane, who last year spent all but one week as the No. 1-ranked player, is still looking to win her first Grand Slam title. At Roland Garros, Wozniacki has never been past the quarterfinals, losing at that stage in 2010.
Francesca Schiavone, the 2010 French Open champion and runner-up last year, defeated Tsvetana Pironkova of Bulgaria 2-6, 6-3, 6-1.
Maria Sharapova's second-round match against Ayumi Morita of Japan was postponed until Friday following John Isner's marathon loss to Paul-Henri Mathieu.
Defending champion Li Na will play Stephanie Foretz Gacon of France.
Information from The Associated Press was used in this report.