Ivanovic beat Dinara Safina in the 2008 French Open final

Ana Ivanovic has withdrawn from the Madrid Open because of a knee injury but insisted she will be fit in time to defend her French Open title on 25 May.

The seventh-ranked Serb is struggling with an inflammation in her right knee and doctors ordered her not to play competitively for a week.

"It's become more painful with each match, so I decided to go and see a specialist in Munich," said Ivanovic.

The 21-year-old added there is "no danger" of her missing the French Open.

Ivanovic has been bothered by her knee problem since a Fed Cup match in April.

606: DEBATE She's had a poor year, I'd be surprised if she defended her title MrInvisible

The former world number one had already suffered a setback ahead of the defence of her French Open title when she was beaten in the third round of the Italian Open by Poland's Agnieszka Radwanska.

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