PARIS -- Top-seeded Caroline Wozniacki showed no sign of trouble from a heavily taped left thigh and beat 40-year-old Kimiko Date Krumm of Japan 6-0, 6-2 on Monday in the first round of the French Open.
The 20-year-old Wozniacki was born more than a year after Date Krumm made her Roland Garros debut in 1989. Date Krumm made the French Open semifinals in 1995, retired the next season and then returned to the tour 12 years later.
Wozniacki made only nine unforced errors Monday, 19 fewer than her opponent.
The Dane had her left leg treated during her victory in the final of a clay-court tournament in Brussels on Saturday. She leads the tour with four titles in 2011.
Schiavone, who last year became the first Italian woman to win a Grand Slam singles title, won four straight games in the first set after being broken early by her 19-year-old American opponent. Schiavone, who had 25 winners to Oudin's six, then won seven straight games to advance.
"I'm still shaking a little bit," Schiavone said of playing on Court Philippe Chatrier for the first time as defending champion. "The court is perfect. Everything is going around you and it's like -- you know when you go home and your mom does everything for you and you feel comfortable?"
Last week, Schiavone had her best result of the season, reaching the semifinals at the Brussels Open.
"I don't get to play on clay, and she's grown up on clay," Oudin said after facing the 30-year-old Schiavone. "I mean, she's a lot older than me, like 10 years, 12 years. That definitely helps for experience for her. But also, I mean, she's just really, really good on the clay."
Oudin -- best known to date for her surprising, upset-filled run to the 2009 U.S. Open quarterfinals -- was one of three 19-year-old women from the United States in first-round action at the French Open on Monday. All three met older opponents from Europe, and all three lost, none more painfully than Christina McHale of Englewood Cliffs, N.J. She led 5-0 in the third set but let that slip away and was beaten 6-7 (4), 6-2, 9-7 by Sara Errani, a 24-year-old from Italy.
"I just wasn't making my shots anymore, and I panicked, and she started feeding off of that," McHale said, fighting tears, "and before I knew it, it was 5-all."
Coco Vandeweghe of Rancho Santa Fe, Calif., was eliminated 7-6 (5), 6-2 by 25th-seeded Maria Kirilenko, a 24-year-old from Russia. It was the first time playing at Roland Garros for Vandeweghe, who never entered the French Open junior tournament -- and who said her former coach dissuaded her from entering the U.S. junior championships played on the surface.
"I never got to play on clay; I always wanted to," said Vandeweghe, the niece of former NBA All-Star and general manager Kiki Vandeweghe. "My game is pretty good for clay. I don't mind it. I can slide pretty well."
No. 3 Vera Zvonareva of Russia, No. 9 Petra Kvitova of the Czech Republic, No. 11 Marion Bartoli of France, No. 12 Agnieszka Radwanska of Poland, No. 16 Kaia Kanepi of Estonia, No. 28 Daniela Hantuchova of Slovakia, No. 29 Shuai Peng of China and No. 30 Roberta Vinci of Italy also advanced, while No. 26 Nadia Petrova of Russia and No. 31 Klara Zakopalova of the Czech Republic lost.
Information from The Associated Press was used in this report.