Mitchell Marner had an assist for the Toronto Maple Leafs, but Tristan Scherwey scored the go-ahead goal at 10:15 of the third period in the Ottawa Senators' 3-1 win at Mile One Centre in St. John's, Newfoundland, on Tuesday.
It was the first preseason game for each team.
Marner set up Kasperi Kapanen's goal that tied the game 1-1 at 3:37 of the third after Maxime Lajoie scored in the first period for Ottawa. Scherwey, who had an assist on Lajoie's goal, is in Senators training camp on a professional tryout contract.
Anthony Duclair scored into an empty net with 1:43 remaining for the 3-1 final.
Anders Nilsson made the save on all 13 shots he faced for Ottawa. Marcus Hogberg made 11 saves on 12 shots in relief.
Starter Frederik Andersen made 12 saves on 13 shots for Toronto. Kasimir Kaskisuo allowed one goal on four shots.
Video: Lajoie, Scherwey lead Senators past Maple Leafs, 3-1