Missing Paul Ifil and Carlos Hernandez to injury it seemed unlikely coming in that Wellington would get the result but they pulled off a memorable result despite losing another two players to injury during the match.
For Western Sydney it ends their home run and the dreams of fortress Paramatta as they fell to their first loss at home in 360 days, just five short of the year, their last coming January 6th when they lost to the Central Coast 2-0 at home.
Both sides really struggled in the opening stages as possession changed hands regularly with neither side really able to force the issue for the opening half hour.
The first real shot came in the 30th minute with a shot from distance from Aaron Mooy who volleyed an effort from the edge of the area that Glen Moss bobbled before the Phoenix defense cleared it away.
Wellington started to work in to the match as well, starting to hold more possession but they still struggled to threaten Ante Covic in the Wanderers goal.
It was the Wanderers who were having the bulk of the chances in the final stages of the first half with Youssouf Hersi and Mark Bridge nearly linking up perfectly for a goal only for Hersi's effort to be much too tame.
As the half drew to a close Shinji Ono nearly had the opener as Jerome Polenz found the Japanese star with a cross but Ono could only find the woodwork as the half ended scoreless.
At the start of the second half the Wanderers thought they had claims for a penalty as Hersi and Andrew Durante collided only for the referee to call play on.
In the 62nd minute the Wanderers finally had their goal as Shinji Ono chipped the defense, allowing Mark Bridge to run on to the ball and, in turn, chip Moss to open the scoring.
That seemed to inspire Wellington and they restored parity just six minutes later as Stein Huysegems got in behind the Wanderers and sent a ball across the face, allowing Tyler Boyd to slide in and tap home his first ever A-League goal.
Ten minutes later Wellington had the lead as Huysegems stole possession from Mooy before skinning Nikolai Topor-Stanley and hitting an impressive strike to the top left hand corner.
With seven minutes to play Huysegems sealed all three points as Boyd centered for Huysegems who was able to back-heel the ball in to the back of the net for a memorable away win.