It took until late in the third quarter for Winnipeg (8-4) quarterback Matt Nichols to throw for his first touchdown, a 15-yard pass to Clarence Denmark to tie the game 29-29.
Kick returner Quincy McDuffie added another touchdown on a 98-yard runback while running back Timothy Flanders added a third on a two-yard run and Nichols carried it a yard for a fourth. Medlock's longest field goal came from 53 yards.
Dan LeFevour threw four touchdown passes for the Argos (5-7) and Lirim Hajrullahu added a single on a punt. LeFevour was intercepted twice.
Penalties hurt the Bombers, with seven in the first half compared with four handed to Toronto, and the game got off to a shaky start for both sides.
There was a short 37-yard kickoff from Bomber-turned-Argo Hajrullahu that left Winnipeg in possession midfield.
(The Canadian Press)