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The Socceroos sharpshooter scored in each half at Bankwest Stadium to give him a tally of 15 goals in14 games against Western Sydney.
City dominated the game despite losing their head coach and a key player in the leadup.
With Patrick Kisnorbo coming down with suspected food poisoning, assistant Des Buckingham took charge.
"We spoke to him (Kisnorbo) before the game... the message didn't change, it just came from a different person," Buckingham said.
Florin Berenguer pulled out after tweaking an ankle in the warm-up and was replaced by Naoki Tsubaki, while another influential player, Adrian Luna, missed the game with a hamstring niggle.