Samsonov, who was recalled from Toronto of the American Hockey League on Wednesday, made 20 saves in his first start since being placed on waivers on Dec. 31.
“I thought battled his [butt] off,” Keefe said. “It’s the best I’ve thought he’s looked all season in terms of how he was tracking the puck. ... So, I think this is a positive step for him.”
The Maple Leafs went 0-for-3 on the power play, with all three opportunities coming in a scoreless first period.
“That’s not ideal,” Reimer said. “That’s not the game plan to give those guys that have that many weapons opportunities, but it just spoke to the intensity and integrity that we played with as far as how we killed. We stuck to our structure, obviously they had a few looks because they have some good players, but I thought we killed extremely well and it set the tone.”
Holmberg did score 32 seconds into the second period to give Toronto a 1-0 lead. He redirected in a point shot from Morgan Rielly in the slot.
Larkin tied it 1-1 at 15:39 when he one-timed a pass from David Perron just below the left face-off dot.
Marner put the Maple Leafs back in front 2-1 at 18:18, tapping a return pass from Tyler Bertuzzi into an open net.
Daniel Sprong tied it 2-2 at 2:46 of the third period with a backhand on a breakaway.
After Copp put Detroit in front, Lucas Raymond scored into an empty net with 19 seconds remaining for the 4-2 final.
“It truly is a blessing that we get to play a sport for a living,” Reimer said. “Every once in a while it’s a special night, and tonight was one of those nights. A ton of adversity, backs against the wall, schedule is all messed up with flying in late and all of that. Those are games where you can cave or you can dig in, and I thought as a group, to a man, we dug in.”
NOTES: Marner's goal was his 600th NHL point. He reached the milestone in 548 games, the fastest Maple Leafs history. Darryl Sittler previously held the record at 584 games. ... Toronto forward Bobby McMann did not play because of an undisclosed injury. Keefe said he is day to day.