Sony

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Samantha Stosur, of Australia, returns a shot from Coco Vandeweghe, of the United States, at the Sony Open tennis tournament, early Sunday, March 23, 2014, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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Coco Vandeweghe celebrates after defeating Samantha Stosur of Australia, 5-7, 7-5, 7-5 at the Sony Open tennis tournament, early Sunday, March 23, 2014, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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Coco Vandeweghe, of the United States, returns a shot from Samantha Stosur, of Australia, at the Sony Open tennis tournament, early Sunday, March 23, 2014, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)