As it were in the reverse fixture, a 1-0 win for the Wanderers over the defending champions.
Despite Youssof Hersi’s 37th minute red card, the Wanderers held on to their slender advantage for an important away win.
The Western Sydney Wanderers defeated the reigning champions away from home to record a historic victory.
Alessandro Del Piero scored from a penalty rebound as the Blues won the first ever Sydney derby.
A game that pitted two counter-attacking sides against each other was a tight battle, before a classic counter-attacking goal settled the game.
Both the Wanderers and the Mariners put an emphasis on denying the opposition space and neither side could find the breakthrough.