Lucas Poisson scored the game-winner in overtime as Wheatley beat Essex 2-1 in the Provincial Junior Hockey League Sunday.
Bryce O'Brien scored the lone goal for the 73's, who got 31 saves from Jax Dhont.
Essex outshot the Sharks 37-31.
Essex (8-3-0-1) is fourth in the Stobbs Division standings, a point behind third-place Amherstburg (8-3-1-1).
The Admirals played the Blades to a 4-4 tie in Blenheim Sunday.
Broden Meloche had a goal and an assist for Amherstburg, who outshot the Blades 43-35.
Cody Schneider, Andrew Clark and Mitchell Demelo also scored for the Admirals.
Amherstburg was 0-6 on the power play, while Blenheim was 1-8.