Deacon's goal soon after extended the lead to six points after Nathan Fien was penalised for a high tackle.
BBC: Wigan Warriors 15-21 St George Illawarra Dragons
2.
Kiwi coach Stephen Kearney has kept Thomas Leuluai at hooker, after switching him there from scrum-half for the semi-final, with Nathan Fien continuing at number seven.
BBC: Aussies driven by fear of failure
3.
An astute Benji Marshall kick looked to have set up Nathan Fien for another four points but the St George Illawarra half-back was correctly ruled offside.