Results on Thursday in the ATP tournament at Delray Beach, Florida: 2nd rd Frances Tiafoe (USA) bt Tommy Paul (USA) 7-5, 7-6 (7/4) Ugo Humbert (FRA x6) bt Miomir Kecmanovic (SRB) 6-4, 7-6 (8/6) Steve Johnson (USA) bt Jack Sock (USA) 6-4, 5-7, 6-1 Milos Raonic (CAN x2) bt Cedrik-Marcel Stebe (GER) 7-5, 6-3 afp