United have nothing to worry about.
They played 5pm Sunday - a horrid time for Melbourne teams across all codes. Melbourne City played across the road and only got 7,500 in a 30,000 seat stadium, kicking off an hour earlier.
Phoenix played in the prime timeslot, with free entry for kids and played against the future NBA #1 pick - they were always going to get a cracking crowd to this one.
Like the post says above, let's see what crowd they pull when they play Brisbane and Cairns.
SEM will average about 7,000 - 8,000 and Utd will average about 9,000