The battle for second place the A-League regular season intensified on Saturday with Melbourne City beating Sydney FC 2-0, sending a message to the newly crowned premiers that their fifth championship was nowhere near guaranteed.
The Sky Blues sealed their fourth Premiers Plate last week and ensured top seeding in the championship playoffs that start later in August.
It was City's first match in 131 days after the shutdown of the league in March and their mandatory two-week quarantine after they and the two other Victoria-based sides had to relocate to New South Wales due to a fresh outbreak of the coronavirus.
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"We're the last team to play. It's been a bit of a challenge but I guess that's made us a bit stronger. We're not going to come here and just roll over. We want to come here and make it worth it."
Wanderers coach Jean-Paul De Marigny was incensed after the match and said Fenton's challenge warranted a red card.
He added that Muller was "not in a good place" but the club later said that he had not needed to go to hospital.
The victory lifted Western Sydney to 30 points and within striking distance of sixth-placed Adelaide United, who have 34 but have played one more game.
The top-six advance to the playoffs, with the teams in first and second automatically qualifying for the semifinals.