A goal to substitute Brendan Santalab four minutes from full time has handed Western Sydney a dramatic 1-0 win over fierce rivals Sydney FC on Saturday night.
A pulsating derby looked headed for a draw as neither side were able to make the most of their few clear-cut chances in front of more than 18,000 fans at a raucous Pirtek Stadium.
But just as it appeared the Sky Blues would keep their unbeaten record at Parramatta intact, Santalab had the final say.
Youssouf Hersi managed to skew a cross over from the right which found its way through to Santalab at the far post.
The former Sky Blues attacker controlled on his thigh, before poking the ball under Vedran Janjetovic and into the net.
While the visitors enjoyed the better of the second half, it was a deserved victory for the Wanderers for their first-half effort which saw them hit the woodwork on four occasions.
The result means Tony Popovic's side close the gap on league leaders Brisbane Roar to four points ahead of a clash with the Melbourne Victory on Tuesday night.
Sydney have now won just one of their last five games and have dropped out of the top six for the first time in two months.
The Wanderers had the better chances of an absorbing first half and started their string of finding the frame of the goal inside eight minutes.
Tomi Juric picked up a loose ball 25 metres out and was allowed to turn and drive a low shot which was fortunately tipped onto the post by Janjetovic.