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Wanderers, who started Saturday s match at Bankwest Stadium in eighth spot, behind United on goal difference, scored two in the first half and three more in the second, in their most complete and impressive performance of an inconsistent campaign.
Western Sydney have recorded back-to-back wins, while United - who travelled on the day of the game thanks to concerns over Sydney s recent COVID-19 cases - are winless in their last three and continue to struggle away from home.
Troisi opened the scoring with a fine 19th minute solo effort, charging forward from close to halfway and lashing a fierce shot past United goalkeeper Ryan Scott from just outside the area, and was involved in the build up for Wanderers next three.
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