PARIS — Amelie Mauresmo held her nerve and her serve when it counted today, reaching the second round of the French Open by beating Olga Savchuk 7-5, 4-6, 6-1 in a match disrupted by rain.

Mauresmo, who missed both the Italian and German Opens because of a rib injury, looked shaky much of her time on center court.

"The problem was my serve because I have a minor injury," said Mauresmo, who won the Australian Open and Wimbledon in 2006.

The start of play Tuesday was delayed 2 hours, 50 minutes because of rain, but Russians Svetlana Kuznetsova and Dinara Safina reached the second round before another rain delay of nearly three hours.

When play resumed, No. 14 Agnieszka Radwanska beat Mariya Koryttseva 6-4, 6-3. Among the men, fourth-seeded Nikolay Davydenko beat 2002 Australian Open champion Thomas Johansson 6-3, 6-3, 6-3.

Each of the first three days of the French Open has been affected by rain, but Tuesday was the worst yet. At least 20 matches were postponed, including top-seeded Maria Sharapova's encounter against Evgeniya Rodina.

Mauresmo, who has never gotten past the quarterfinals at Roland Garros, was broken in her first two service games, and then again while serving for the first set at 5-4.

Leading 6-5 and again serving for the set, the Frenchwoman double-faulted for the fourth of her nine times to give her Ukrainian opponent a break point, but Mauresmo saved it with a backhand winner. She won the set when Savchuk sent a forehand into the net.

In the second set, Savchuk jumped to a 2-0 lead, but Mauresmo got back to 2-2 before the rain. When they came back on court, each player held serve until Savchuk broke Mauresmo while leading 5-4.

Mauresmo dominated the third set by winning four straight games at the start.

"It wasn't an easy day," Mauresmo said. "There were ups and downs in the first and second sets, a bit less in the third."

The fourth-seeded Kuznetsova defeated Aiko Nakamura of Japan 6-2, 6-3 before the rain interrupted play.

"I was first. I was lucky with that," said Kuznetsova, the 2004 U.S. Open champion. "I get in my match, so I have the rest of the day to relax, to take it easy, and tomorrow I practice and get prepared for my next match."

Despite the soggy weather, Kuznetsova didn't appear to have any problems against the 71st-ranked Nakamura.

"I hit the ball big, but I also do hit heavy," Kuznetsova said. "And when the ball with these conditions was very heavy, it was very comfortable for me.

"I was a bit weaker in the second set," the Russian added. "First few games I didn't play very well."

Nakamura has never reached the second round in four appearances at the French Open.

"I don't have pressure," Nakamura said, referring to her match with Kuznetsova. "A little bit nervous."

Safina, seeded 13th, defeated Kateryna Bondarenko of Ukraine 6-1, 6-3.

"I'm really happy that I could go through in two sets, especially before the rain started," said Safina, who missed the Italian Open with a back injury.

Safina, who was the last person to beat Justine Henin before the top-ranked Belgian retired this month, said she still had pain in her back.

"This is my weakest part of my body: the back," said Safina, the younger sister of two-time Grand Slam champion Marat Safin. "So I really had to go home and I had to take some care of it. I'm tall, so not always I can bend my knees, so I use really a lot my lower back."