Del Potro Withdraws from Miami Tournament

Mar. 21 -- Defending U.S. Open champion Juan Martin del Potro, a rising Argentine star, pulled out of Miami's Sony Ericsson Open tennis tournament with a wrist injury.

Del Potro has a right wrist injury that has bothered him since the start of the season.

The tournament announced the withdrawal Friday, two days after informing that Maria Sharapova wouldn't participate because of a bone bruise in her right elbow. Second-ranked Dinara Safina and 2008 champion Nikolay Davydenko also withdrew.

The 13-day tournament begins Tuesday. The field still includes Roger Federer and Rafael Nadal.

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