British number three Kyle Edmund went through at the Delray Beach Open after Adrian Mannarino became the Briton's second opponent in succession to default following an angry outburst.
Edmund, 22, led 6-3 5-0 15-0 when the Frenchman was penalised a game for smashing a ball out of the court.
Mannarino had earlier kicked a chair, and hit a ball towards a ball boy.
Edmund's previous match against Canada's Dennis Shapovalov in the Davis Cup ended similarly.
The 17-year-old Canadian was defaulted for angrily smashing a ball which hit umpire umpire Arnaud Gabas, who later required surgery to repair a fractured eye socket.