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MADRID, SPAIN - MAY 13: Cristiano Ronaldo of Real Madrid attends the tennis as Rafael Nadal of Spain plays against Novak Djokovic of Serbia in the semi finals during day eight of the Mutua Madrid Open tennis at La Caja Magica on May 13, 2017 in Madrid, Spain. (Photo by Julian Finney/Getty Images)

MADRID, SPAIN - MAY 13:  Cristiano Ronaldo of Real Madrid attends the tennis as Rafael Nadal of Spain plays against Novak Djokovic of Serbia in the semi finals during day eight of the Mutua Madrid Open tennis at La Caja Magica on May 13, 2017 in Madrid, Spain.  (Photo by Julian Finney/Getty Images)