Sean Callaghan, Ryan Van Stralen, Steven Janes, Nevin Guy and Taylor Fielding each scored once for the 67's (7-17-2) as Dante Salituro chipped in with three assists.
Keegan Wilson made 24 saves for the win as Jacob Blair allowed three goals on eight shots and was pulled 10 minutes into the game. Clint Windsor stopped 30-of-33 shots in 49 minutes of relief, but took the loss.
Guelph went 1-for-5 on the power play while Ottawa scored twice on five chances with the man advantage.
We've got to find a way to win a game. He's played well in the minors, now he gets his opportunity. We tried [with Jonathan Bernier]. The way I look at it, you get opportunities and you make the most of it. That's what [James Reimer] did. Now another opportunity is here and Sparks ... you gotta grab it. Is he ready? We'll find out.
— Maple Leafs coach Mike Babcock to the Toronto Star on recalling goalie Garret Sparks from the AHL to start Monday in his NHL debut
TONIGHT ON NHL NETWORK
5:00 ET: NHL Live Powered by Constellation 7:00 ET: NHL Tonight