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PARIS, FRANCE - MAY 28: Novak Djokovic of Serbia is watched by coach Andre Agassi during practice on day one of the 2017 French Open at Roland Garros on May 28, 2017 in Paris, France. (Photo by Julian Finney/Getty Images)

PARIS, FRANCE - MAY 28:  Novak Djokovic of Serbia is watched by coach Andre Agassi during practice on day one of the 2017 French Open at Roland Garros on May 28, 2017 in Paris, France.  (Photo by Julian Finney/Getty Images)