Dominic Thiem from Austria returns the ball during a Madrid Open tennis tournament match against Stanislas Wawrinka from Switzerland, in Madrid, Spain, Tuesday, May 6, 2014. (AP Photo/Andres Kudacki)

Spain Madrid Open Tennis

Dominic Thiem from Austria returns the ball during a Madrid Open tennis tournament match against Stanislas Wawrinka from Switzerland, in Madrid, Spain, Tuesday, May 6, 2014. (AP Photo/Andres Kudacki)

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