The former No. 1 player 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  \u0014 brief enough to be completed between showers. Play was delayed for 4? hours at the start, and there were two later interruptions.

Nine other matches were completed, seven on the women's side. No. 4-seeded Jelena Jankovic and No. 11 Li Na won, while 39-year-old Kimiko Date Krumm lost to Jarmila Groth of Australia 6-0, 6-3.

Date Krumm 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.

Three seeded women were beaten: No. 8 Agnieszka Radwanska, No. 21 Vera Zvonareva and No. 32 Kateryna Bondarenko.

Radwanska was upset by Yaroslava Shvedova of Kazakhstan 7-5, 6-3. Zvonareva lost to Anastasia Rodionova of Australia 6-4, 6-4. Bondarenko was beaten by Aleksandra Wozniak of Canada 6-4, 6-1.

Jankovic eliminated Kaia Kanepi of Estonia 6-2, 3-6, 6-4.

Na 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." On the men's side, No. 25 Marcos Baghdatis rallied past Marcel Granollers of Spain 4-6, 6-1, 7-5, 6-2.

Sixteen singles were postponed, including those involving Rafael Nadal, Novak Djokovic and Serena Williams, meaning they won't play their second-round matches until at least Friday  \u0014 the sixth day of the tournament. Nadal faces Horacio Zeballos, Djokovic plays Kei Nishikori, and Williams takes on Julia Goerges of Germany.

Twenty doubles matches were also postponed.

No. 6-seeded Andy Roddick led Blaz Kavcic 6-3, 5-7, 4-3 when their match was suspended for a second time. Those still scheduled to take the court on Thursday included four-time champion Justine Henin and Maria Sharapova.

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. 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.

During the first rain delay, the players' cafeteria and lounge areas in the main stadium were packed with players and their entourages, and there were long lines at concession stands and souvenir shops. Several hundred fans sat under umbrellas on center court watching a video replay of last year's final between Roger Federer and Robin Soderling.

"I'm on the floor of the lockeroom in my bed of towels playing Angry Birds," American doubles specialist Bob Bryan tweeted four hours into the delay. "Anyone have 3 stars on all levels?" Rain fell with the tournament already behind schedule following three delays Wednesday, the longest of which lasted 90 minutes. Four men's second-round matches were suspended because of darkness Wednesday night, and four women's matches were postponed.

The only washout of an entire day's schedule on record at Roland Garros occurred May 30, 2000. Even so, the French tennis federation has been pushing for a roof and has studied the possibility of moving the tournament, with a site next to the Versailles castle among the locations being considered.

A project announced last year to build a new court with a retractable roof less than 500 yards from the current center court was blocked because of political issues.

Wimbledon added a retractable roof last year atop a stadium that opened in the 1920s, and the Australian Open has retractable roof over two courts. But the French and US Open must wait when it rains.