Sydney FC striker Bobo continued his fruitful second A-League spell, scoring the goal that ended the Sky Blues' derby drought and landing a hammer blow to Western Sydney's finals hopes in the process.
The Brazilian's 62nd-minute header from an exquisite dink cross by Milos Ninkovic was his tenth goal of the season and secured the 1-0 win over the Wanderers at the SCG.
While that consolidated Sydney's hold on second spot, it left the Wanderers in eighth place and three points off sixth with just three games to play.
It was Sydney's first win in seven A-League matches against Wanderers stretching back to December 2018 and they could have won by a larger margin but for some good saves from Daniel Margush.
After a tight first half of few chances, Sydney dominated the first 20 minutes of the second and Bobo's goal was a deserved reward for the home side.
Both teams had the ball In the net from a first-half setpiece, but neither counted.
Bobo's slick 26th-minute finish from a corner was scratched by referee Chris Beath after Rhyan Grant was adjudged to have pushed Mitchell Duke.
A couple of minutes before halftime Bruce Kamau rounded off a perfect corner variation with a precise shot into the net, only for the goal to be overturned by VAR for a block by Ziggy Gordon on Ninkovic.
The Sky Blues created more chances later in the half, with Anthony Caceres having a shot turned around the post by Western Sydney goalkeeper Margush.
The Wanderers custodian produced two more important saves in the first few minutes of the second half.
He leapt to his left to push away a powerful Luke Brattan free-kick and tipped a Bobo header from a corner over the bar.
The Brazilian was just off target with another header and Margush caught a sharp shot from Kosta Barbarouses as Sydney ramped up the pressure.
After Bobo's goal chances were few and far between with Troisi putting a free-kick over the bar moments before being substituted.
Both sides had an attempt in the 78th minute, with Redmayne saving from substitute Bernie Ibini and Margush producing another good stop to deny Ninkovic, while Barbarouses was just off target with a long-range effort.