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MONTE-CARLO, MONACO - APRIL 11: Gael Monfils of France returns a backhand during his match against Gilles Muller of Luxemburg during day two of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 11, 2016 in Monte-Carlo, Monaco. (Photo by Michael Steele/Getty Images)

MONTE-CARLO, MONACO - APRIL 11:  Gael Monfils of France returns a backhand during his match against Gilles Muller of Luxemburg during day two of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 11, 2016 in Monte-Carlo, Monaco.  (Photo by Michael Steele/Getty Images)