Gerber stopped 22 of the 23 shots he faced from the Senators to help his Edmonton Oilers get their eastern Canada road trip off on the right foot with a 4-1 victory.
"It's definitely nice to have this one," Gerber said. "It's always emotional to play somewhere you've been around for a while and it was really great to see the guys out there compete and, for most of the game, we had a good game."
Andrew Cogliano scored the go-ahead goal early in the third period, then set up Gilbert Brule for another as the Oilers (7-12-4) came from behind and won for the second time in three games.