Andy Roddick is confident that he will be fit for next month's Wimbledon Open despite being forced to withdraw from his first-round match at the French Open on Tuesday due to an ankle injury.

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The fifth-seeded American was trailing Spaniard Alberto Martin 6-4, 7-5, 1-0 when he quit.

It was the third time that Roddick has fallen in the first round in Roland Garros and he has only advanced to the third round once, in his 2001 debut.

Roddick, who first suffered the injury last week at the World Team Cup, said the ankle never felt 100 percent but he expected to be fit for the grasscourt season.

"The good news is I have a little bit of time before Queen's," Roddick told reporters at the post-match press conference.

"Grass isn't as gruelling, or shouldn't be as gruelling, on it (the ankle). That's a good thing.

"That's my surface. That's the one I really look forward to every year. I'm going to be pumped up to get on grass," added the runner-up at Wimbledon for the past two years.