 He entered the 1932 Olympic trials as a bantamweight, a class permitting up to 118 lb (53.5 kg); he weighed 116.Gwynne won the Canadian amateur bantamweight title, which sent him to the 1932 Summer Olympics in Los Angeles, despite his having fought only fifteen bouts before the Games.He won the Olympic gold medal match against the German Hans Ziglarski, knocking him down in the second round and winning on points.