Makeshift left-back Adam Parkhouse was targeted relentlessly and was unsurprisingly replaced by All Whites fullback Tom Doyle with less than half an hour gone. Just as the Phoenix looked to be gaining some parity, the Wanderers doubled their lead when Santalab scored his first goal, firing a left-footed thunderbolt past Moss, who got a hand to the fierce strike but couldn't keep it out.
Santalab's second, and Western Sydney's third, allowed the Wanderers to spend the second half protecting their lead, comfortably securing the three points which should ensure they, rather than the Phoenix, will enjoy finals football at the end of next month.
Gui Finkler's precise free-kick with fifteen minutes to go reduced the deficit, but in a game of such importance, the Phoenix strike-force was curiously ineffective, fashioning just two further shots on target in the entire contest.
To add to the frown lines of coach Des Buckingham, seven Phoenix players will miss the next game through international duty, testing the depth of the squad ahead of what is now a not-negotiable must-win home game against the Newcastle Jets on Sunday evening.