The giant Opelka fired down 25 aces and 47 winners in two tiebreak sets, winning 7-6 (3) 7-6 (0), as Draper suffered a second-round exit

British number two Jack Draper is knocked out of the Miami Open in the second round by Reilly Opelka, but Katie Boulter progresses as her opponent Clara Tauson retires injured.