Barrett Hayton had two goals and two helpers in regulation before Morgan Frost scored 15 seconds into overtime, lifting the Soo Greyhounds over the Windsor Spitfires 6-5.
Cole MacKay, Jordan Sambrook and Keeghan Howdeshell also scored for Sault Ste. Marie (13-6-4) in Sunday's game.
Mario Peccia made 29 saves for the win.
Daniel D'Amico, Grayson Ladd, Curtis Douglas, Mathew MacDougall and Kyle McDonald supplied the Spitfires (11-10-2) offence.
Kari Piiroinen turned away 33 shots in defeat.
The OHL's Spitfires return to action in Flint on Friday then come back to the WFCU Centre for home games Saturday and Sunday.