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KEY BISCAYNE, FL - MARCH 24: Stanislas Wawrinka of Switzerland plays a forehand volley against Edouard Roger-Vasselin of France during their third round match during day 8 at the Sony Open at Crandon Park Tennis Center on March 24, 2014 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 24:  Stanislas Wawrinka of Switzerland plays a forehand volley against Edouard Roger-Vasselin of France during their third round match during day 8 at the Sony Open at Crandon Park Tennis Center on March 24, 2014 in Key Biscayne, Florida.  (Photo by Clive Brunskill/Getty Images)