American Sam Querrey began his Delray Beach Open tennis title defence with a victory over Dudi Sela of Israel.
Fourth-seeded Querrey was leading 6-2 2-1 when Sela retired.
World No.35 Querrey advanced to a second-round match with either Jared Donaldson or Mikhail Kukushkin.
Eighth seed Kyle Edmund of Great Britain also advanced on Monday (Tuesday AEDT) with a 6-3 6-0 triumph over Adrian Mannarino of France.
Edmund next plays Lu Yen-Huen, who came from behind to beat Bjorn Fratangelo 4-6 7-5 6-4.
Yoshihito Nishioka of Japan won his first-round match 6-3 6-3 over qualifier Kimmer Coppejans of Belgium.
Nishioka will next face either fifth seed Steve Johnson or Stefan Kozlov.
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