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KEY BISCAYNE, FL - MARCH 25: Vasek Pospisil of Canada plays a match against Joao Sousa of Portugal during Day 5 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 25, 2016 in Key Biscayne, Florida. (Photo by Mike Ehrmann/Getty Images)

KEY BISCAYNE, FL - MARCH 25:  Vasek Pospisil of Canada plays a match against Joao Sousa of Portugal during Day 5 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 25, 2016 in Key Biscayne, Florida.  (Photo by Mike Ehrmann/Getty Images)