Missing Alessandro Del Piero the Sydney attack created few chances, but it was that familiar sinking feeling for Sydney FC as the defense made far too many errors, allowing Wellington several opportunities.
Wellington Phoenix dominated Sydney throughout the first half and were well deserving of their goal when it finally came in the 33rd minute.
Carlos Hernandez showed his class to find Stein Huysegems with a perfect ball, allowing the Belgian to round the keeper and just pass the ball in to the back of the net, making up for his penalty miss against the Mariners midweek.
When Sydney FC were creating chances they were finding ways to make them disappear, by far the most creative being Joel Chianese's effort that saw him slip at the crucial point and send his effort wide of the mark.
Ali Abbas had a reasonable chance that he maybe should have done better with as he did well to get a shot away but could only find Glen Moss.
Paul Ifill was given too much space allowing him to send the ball in for Huysegems who hit a shot but could only find the post, letting Sydney off the hook.
Things probably should have been even worse for Sydney moments before the break as Huysegems went down in the box but didn't get the call from the referee, keeping it 1-0 at the break.
The start to the second half saw nervous moments for Wellington, first as Ifill had to be stretchered from the field before Ranko Despotovic sent his effort over the bar.
In the 65th minute Wellington probably should have made it two as Hernandez made a good run only to be denied by an impressive Vedran Janjentovic save from close range.
Wellington continued to attack for the remainder of the match and a porous Sydney defense allowed the chances to come but the killer instinct just wasn't there as Wellington had to settle for a 1-0 win.
The win sees Wellington three points clear of last placed Melbourne Heart and gets manager, Ernie Merrick, his first win with the New Zealand side, while leaving Sydney in a three-way log jam for third with 18 points.