Results from ATP Tour Delray Beach tournament on Monday (x denotes seed) 1st rd Brandon Nakashima (USA) bt Jiri Vesely (CZE) 7-6 (7/4), 6-1 Ryan Harrison (USA) bt Damir Dzumhur (BIH) 6-3, 6-2 Mackenzie McDonald (USA) bt Yasutaka Uchiyama (JPN) 6-2, 7-6 (7/5) Frances Tiafoe (USA) bt Emilio Gomez (ECU) 7-6 (7/3), 6-2 Yoshihito Nishioka (JPN) bt John Millman (AUS x5) 3-6, 6-4, 6-2 Kwon Soon-woo (KOR) bt Adrian Mannarino (FRA x7) 1-6, 6-3, 6-2 afp