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MADRID, SPAIN - MAY 11: Dominic Thiem of Austria thanks the court staff after sweeping the surface in his match against Grigor Dimitrov of Bulgaria during day six of the Mutua Madrid Open tennis at La Caja Magica on May 11, 2017 in Madrid, Spain. (Photo by Julian Finney/Getty Images)

MADRID, SPAIN - MAY 11:  Dominic Thiem of Austria thanks the court staff after sweeping the surface in his match against Grigor Dimitrov of Bulgaria during day six of the Mutua Madrid Open tennis at La Caja Magica on May 11, 2017 in Madrid, Spain.  (Photo by Julian Finney/Getty Images)