Ana has no problem with her knee

Ana Ivanovic played down fears over the state of her right knee after launching the defence of her French Open crown with an unconvincing straight-sets win against Italy's Sara Errani yesterday.

Ana Ivanovic played down fears over the state of her right knee after launching the defence of her French Open crown with an unconvincing straight-sets win against Italy's Sara Errani yesterday.

The Serbian's build-up to Roland Garros has been hampered by the injury she sustained in Rome earlier this month and she played today on Philippe Chatrier court with partial strapping on the front of her knee.

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