TORONTO -- When three-on-three overtime didn't work, the Ottawa Senators and Toronto Maple Leafs took part in the first shootout of the NHL season.
Mike Hoffman scored the winner in that shootout as the Senators came back from blowing a three-goal lead to defeat the Leafs 5-4 Saturday night at Air Canada Centre.
Ottawa (2-0-0) and Toronto (0-2-1) went to the first shootout in the NHL's 19th game, thanks to Craig Anderson making seven saves in overtime.
Kyle Turris, Alex Chiasson, Milan Michalek and Mark Stone scored in regulation for the Senators, who got 37 saves in total from Anderson. Reigning Norris Trophy winner Erik Karlsson had three assists.
Joffrey Lupul, Tyler Bozak, Peter Holland and Daniel Winnik had the Leafs goals as they made good on their vow to be better after falling behind.
Toronto goaltender James Reimer, vying to replace Jonathan Bernier as the starter, stopped 29 of the 33 shots he faced.
After the Leafs dominated the play in a scoreless first period, Turris opened the scoring 46 seconds into the second. As four Toronto penalty killers converged on the boards, Karlsson found Turris wide open in the slot for a goal in his 400th NHL game.
Chiasson scored a less-traditional power-play goal 3:38 in, stepping out of the penalty box to score on a breakaway and make it 2-0 Ottawa.
The Senators made it 3 for their first 3 on the power play at 4:56 when Michalek corralled a rebound of a shot by Karlsson and beat Reimer in front.
With Winnik pressuring, Ottawa defenceman Patrick Wiercioch turned the puck over right to Lupul at 7:05 as the Leafs scored their first even-strength goal of the season.
Bozak made it two when captain Dion Phaneuf made a perfect stretch pass up the middle of the ice at 14:33 of the second.
After Holland tied it with some nifty stick work in front on the power play 3:18 into the third, Stone deflected Mike Hoffman's shot past Reimer at 8:59 to restore Ottawa's lead.
But the Leafs weren't done, as Winnik scored at 16:21 to tie the score again. Referee Kevin Pollack waved it off when it first happened, but the situation room looked at it, asked for the horn to blow to stop play and ruled the puck went in.
Notes: Roman Polak and Michael Grabner made their Leafs debuts, replacing Scott Harrington and Shawn Matthias. The team announced Matthias was day-to-day with an upper-body injury. ... The Senators play host to the Montreal Canadiens on Sunday.