Sydney FC has claimed a historic fifth A-League championship after beating Melbourne City 1-0 in extra time in a dramatic grand final.

After neither side was able to score in regular time at the Western Sydney Stadium, Rhyan Grant broke the deadlock in the 10th minute of the opening period of extra time.

The Sky Blues are the first club to win five A-League championships and the second to win back-to-back grand finals.

City  looked to have scored through defender Harrison Delbridge in the 18th minute only for it to be disallowed when Lachlan Wales was ruled to have blocked the view of Redmayne.