Scully racked up 19 disposals but got his game going in the second half and was brilliant in the clinches for Casey.
It was his first game back from a knee injury.
Williamstown coach Peter German said Scully got Casey back into the game on the weekend.
“Scully was terrific in the stoppages in the second and third quarter and he probably started to get their momentum going,” German said.
Meanwhile, the Western Bulldogs may decide to recall ruckman Ben Hudson against Geelong after performing OK for Williamstown
“Huddo was Ok. He worked around the ground hard. I think sometimes we’ve got to look for certain individual facets of AFL players’ games because the game is so different to AFL from VFL,” German said.
“He competed strongly and had a great attitude. When we needed something in the third quarter, I thought he gave our blokes some good ball use at ground level.”