Usher turned the set around and won it 3-2 to secure his victory, with Gates missing six darts at double in the final set that would have seen him level up the contest.
Gates hit double top to move within one leg of the set and then stepped back to the oche to start the third leg.
Graham Usher produced a bizarre moment after his opponent Leonard Gates won the second leg of the fourth set.
If it was an attempt at mind games by Usher it may have worked as Gates failed to win another leg.
Gates looked into space in the opposite direction as Usher finally relented and moved away from the oche after a few seconds.
