Ivanovic won the French Open last year after being runner-up in 2007
Ana Ivanovic says she is fit to defend her French Open title after shaking off a persistent knee injury.
"Thankfully, the pain and inflammation have gone away so I have been able to practise this week," the Serbian world number eight told her website.
"My timing is pretty good at the moment and I'm optimistic about my chances of success in Paris."
Ivanovic, 21, aggravated her injury while playing in her country's Fed Cup win over Spain in April.
She pulled out of the Madrid Open earlier this month.
Ivanovic will need to find her form quickly if she is to stand any chance of success when the French Open begins on Sunday, 24 May.
She became world number one after last year's success at Roland Garros, but has since won just one event - the Linz Open last October.
Despite the odds being stacked against her, Ivanovic remains upbeat.
"Obviously I haven't had the preparation I would have liked, but on the positive side I also didn't play many matches before the French Open last year," she said.
Fellow Serbian Jelena Jankovic is also looking to put some patchy form behind her in Paris.
Defeated in the Madrid quarter-finals by Patty Schnyder, she has dropped to fifth in the rankings.
"I expected a lot more of myself in Madrid, but it's history and I now have to raise my game for the French Open," Jankovic said.
"I know where I have to improve and I also have to make radical changes to be number one again."