Results on Friday in the ATP tournament at Delray Beach, Florida (x denotes seeding): Quarter-finals Ugo Humbert (FRA x6) bt Frances Tiafoe (USA) 6-1, 6-2 Yoshihito Nishioka (JPN) bt Brandon Nakashima (USA) 3-6, 7-6 (7/5), 6-4 Reilly Opelka (USA x4) bt Kwon Soon-woo (KOR) 6-3, 6-4 Milos Raonic (CAN x2) bt Steve Johnson (USA) 7-6 (8/6), 6-3 afp