Jeff Hopkins' Victory, now 11 games unbeaten, locked in a top-two berth ahead of Adelaide United with two games to go thanks to Wanderers defender Danika Matos' own goal in the 18th minute at Wanderers Football Park.
With two games to go, City (49 points) lead Victory (47) and Adelaide (39).
The game was a catch-up fixture after it was originally postponed due to excessive heat.
Star striker Emily Gielnik glanced a header off the near post in the sixth minute and Nicki Flannery had a shot saved in the 14th.
Gielnik had a fresh air swing at a cross in the 18th minute and the ball bounced off Matos' face and into her own goal for the opener.
Gielnik flicked a Holly Furphy cross wide with a towering header in the 19th minute.
Cushla Rue dragged a shot wide in the 22nd minute and shortly after, Wanderers goalkeeper Shamiran Khamis made an excellent save to deny Gielnik at the near post.
Less than a minute later, Gielnik had a goal chalked off for offside.
Gielnik dragged a shot wide in the 26th minute and was again denied by Khamis on the half-hour mark.
Western Sydney grew into the game, recording 17 shots to Victory's 13, without reward.
Bronte Trew thought she had equalised in the 74th minute but it too was cancelled out for offside.
Star Victory midfielder Alex Chidiac suffered a right shoulder/collarbone injury late in the clash when she landed awkwardly after an Amy Chessari tackle, but played out the game.
Wanderers striker Sophie Harding unsuccessfully appealed for a late penalty, believing she had been fouled by Ellie Wilson.
The Victory play Central Coast away on Friday while the last-placed Wanderers travel to face Brisbane on Sunday.
14°C