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KEY BISCAYNE, FL - MARCH 24: Denis Istomin of Uzbekistan plays a backhand against Borna Coric of Croatia in their first round match during the Miami Open Presented by Itau at Crandon Park Tennis Center on March 24, 2016 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 24:  Denis Istomin of Uzbekistan plays a backhand against Borna Coric of Croatia in their first round match during the Miami Open Presented by Itau at Crandon Park Tennis Center on March 24, 2016 in Key Biscayne, Florida.  (Photo by Clive Brunskill/Getty Images)