Wimbledon 2011: Rafa Nadal concerned by foot injury

Defending champion Rafa Nadal admits that he is worried by a foot injury and will seek medical attention for it.

Nadal was troubled throughout his fourth-round match with Juan Martin del Potro, but still managed to win 7-6 (8-6) 3-6 7-6 (7-4) 6-4.

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