In June 1922 Jim Sullivan joined Wigan from Cardiff RFC when he was only 17. His cash value was put at £750, which was a staggering signing-on fee for an adolescent who had not yet played 13-a-side rugby (based on increases in average earnings, this would be approximately £137,700 in 2015). His first game was at home against Widnes on 27 August 1921, and he scored ten points in a 21–0 win. Almost inevitably, Jim Sullivan scored the first points in the first Challenge Cup Final to be played at Wembley Stadium, kicking a penalty after only three minutes of the inaugural Challenge Cup Final against Dewsbury in 1929 in which he led Wigan to a 13–2 victory. Sullivan became player-coach in 1932.