PARIS -- Ana Ivanovic hit another low in her slide since winning the French Open two years ago.
The former No. 1 player lost in the second round at rainy Roland Garros on Thursday, beaten by 28th-seeded Alisa Kleybanova 6-3, 6-0.
Ivanovic was unseeded because she's ranked only 42nd. The defeat marked her earliest exit in six trips to the French Open.
"It was a combination of a few things," Ivanovic said. "I don't think I played that bad, actually. For a while I think she didn't miss a ball at all."
The match lasted barely an hour -- brief enough to be completed between showers. Play was delayed for 4½ hours at the start, and there were two later interruptions.
In other results, No. 4-seeded Jelena Jankovic, No. 5 Elena Dementieva, No. 11 Li Na, No. 17 Francesca Schiavone, No. 18 Shahar Peer and No. 27 Alona Bondarenko won, while 39-year-old Kimiko Date Krumm lost to Jarmila Groth 6-0, 6-3.
Date Krumm, hampered by a right calf injury, became the oldest woman since 1985 to reach the second round when she upset former No. 1 Dinara Safina, the runner-up in 2008 and 2009.
"Before the match I spoke with my husband," Date Krumm said. "He said, 'Don't take so much risks and don't get [an] injury again.'
"But he knows my character, so he didn't say, 'Please, retire,'" she said.
"Overall, it was very difficult because of the conditions," said Jankovic, who struggled in a 6-2, 3-6, 6-4 victory over Kaia Kanepi, a qualifier from Estonia ranked 118th. "I came here around 9 in the morning. To be waiting around in the locker room -- it's really not easy."
Dementieva beat Anabel Medina Garrigues 6-2, 7-6 (3). Schiavone swept Sophie Ferguson 6-2, 6-2. Peer eliminated American Bethanie Mattek-Sands 3-6, 6-0, 6-1. Alona Bondarenko beat Magdalena Rybarikova 6-3, 6-3. Li defeated Stephanie Cohen-Aloro following the long delay at the start of the day, 6-2, 6-2.
"It's not very pleasant to have to wait," Cohen-Aloro said. "But we're all in the same situation."
Sixteen singles matches were postponed, including Serena Williams', meaning those competitors won't play their second-round matches until at least the sixth day of the tournament. Williams plays Julia Goerges.
Twenty doubles matches were also postponed. Five singles matches were suspended because of darkness, with four-time champion Justine Henin and Maria Sharapova leading in the second set of their matches.
Ivanovic has been nursing a right shoulder injury, and her serve was unreliable against Kleybanova. Ivanovic made less than half her first serves, including only 35 percent in the second set, and she won just 17 service points while double-faulting seven times. The Serb is 10-10 this year and has won a total of two matches in the past three Grand Slam tournaments.
"I'm on the right path, and I'm doing lots of things right," Ivanovic said. "I have a plan in place, and I have a really good team around me. I'm very happy with the improvements that have been made."
Last winter she hired Steffi Graf's old coach, Heinz Gunthardt, and she said she has since made progress.
"It's going to take some time for it to become a pattern and just being used to competing again at that high level against top players," Ivanovic said. "Some days it might be there; some days might not. No doubt I'm on the right way."
Kleybanova advanced to the third round for the first time.
Information from The Associated Press was used in this report.