British number one Cameron Norrie beat Reilly Opelka 7-6 (7-1) 7-6 (7-4) in the ATP Delray Beach Open final.
World number 13 Norrie won both sets on a tie-break after he and Delray Beach-based Opelka held their serve throughout in Florida.
He is the first left hander to win the tournament since 2004.