The newly-formed Sydney side lost 2-0 to Central Coast Mariners, who finally ended their streak of losing in the championship finale.
Fairytale ends in heartbreak for Western Sydney Wanderers as Mariners end A-League title jinx
It was fourth time lucky for Central Coast Mariners as they broke their championship jinx to end Western Sydney Wanderers' fairy tale season and claim their first A-League grand final win.
The Mariners finally ended their unwelcome streak with a 2-0 win over the debutant Sydney side, courtesy of goals from Patrick Zwaanswijk and Daniel McBreen.
The triumph ended the Mariners' title heart-break after losing all three of their previous grand finals in 2011, 2008 and 2006.
Wanderers, who surged into the season decider on the back of 13 unbeaten games, had been looking to claim the title in their first season, having been formed just 10 months ago.
But instead Shinji Ono was well marked by the Mariners defence and they failed to trouble young Central Coast goalkeeper Mathew Ryan.
The veteran Dutch defender gave the Mariners the lead with a thumping header off a corner in the 44th minute but they were fortunate not to concede a penalty moments later when defender Pedj Bojic appeared to handle the ball in his own penalty area.
The Mariners clinched the title when German defender Jerome Polenz gave away a penalty for handball midway through the second half.
McBreen powered the spot kick past Ante Covic, the Wanderers goalkeeper, to put the Mariners two-up.
The Mariners will have little time to celebrate their title success as they head for South Korea on Monday to play Suwon Bluewings in the AFC Champions League on Tuesday.
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