Fill-in for Azarenka wins at Key Biscayne

AP - Sports
Fill-in for Azarenka wins at Key Biscayne
Juan Martin del Potro, of Argentina, returns to Tobias Kamke, of Germany, during the Sony Open tennis tournament in Key Biscayne, Fla., Friday, March 22, 2013. (AP Photo/Alan Diaz)
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