A-League leaders Central Coast Mariners moved four points clear at the summit as they downed Perth Glory on Tuesday.
Melbourne Victory fought back from 3-1 down to draw level with 10-man Western United, only to concede a stoppage-time winner.
Melbourne Victory are rooted to the foot of the A-League table after Wellington Phoenix grabbed a point against Western Sydney Wanderers.
Graham Dorrans and Kwame Yeboah scored in the second half as Melbourne Victory slipped to another defeat.
Brisbane Roar won a seven-goal game against Melbourne Victory, while Macarthur and Western Sydney Wanderers drew.
Bernie Ibini looked set to fire Wanderers to the A-League summit, but Roy O'Donovan's penalty undid that prospect.
Central Coast Mariners' perfect start to the new season was brought to an end by Western Sydney Wanderers.
Melbourne City battled back to win in the A-League on Saturday, but defending champions Sydney FC were held to a draw.
Western Sydney Wanderers ground out victory at Newcastle Jets, with Tate Russell's impressive strike proving crucial.
Macarthur made a dream start to life in the A-League with a triumph over near neighbours Western Sydney Wanderers.