Rafael Nadal withdrew from his semifinal match against Andy Murray due to a knee injury, at the Sony Ericsson tennis tournament, Friday, March 30, 2012, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
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Rafael Nadal withdrew from his semifinal match against Andy Murray due to a knee injury, at the Sony Ericsson tennis tournament, Friday, March 30, 2012, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
