Toronto leads the best-of-7 series 3-2. Game 6 will be in Ottawa on Thursday (7 p.m. ET; CBC, TVAS, SN, TBS, MAX).
Brady Tkachuk and Tim Stutzle each had a goal and two assists for the Senators, who are the first wild card from the Eastern Conference.
“It took everybody,” Tkachuk said. “Our best player tonight was Linus, who made some huge saves for us, but it took everybody on the bench, everybody in our room. Everybody wanted to win. Our will to win was high and I think it paid off.”
Anthony Stolarz made 15 saves for the Maple Leafs, who are the first seed from the Atlantic Division and are 1-13 in their past 14 games where a win would have eliminated their opponent.
“They capitalized on two chances and we seemed a little snakebitten getting pucks by Linus tonight,” Stolarz said. “At the end of the day, if you were to tell us before the series we’d be up 3-2 going back to their place, that’s a position that we’ll take.”
Ullmark stopped John Tavares on a breakaway at 4:45 of the first period to keep it scoreless. Chris Tanev then outmuscled Ottawa forward Drake Batherson at the side of the net at 18:58 with the Senators on the power play, preventing him from tapping in a loose puck in the goal crease.
Toronto outshot Ottawa 12-4 in the first period.
“I thought we started well, good chances,” Maple Leafs forward Auston Matthews said. “I thought, just, the execution at times wasn’t there. Obviously, they get the first goal and we’re just kind of chasing the game from there, but I thought we did good things. But in the end, there’s little plays, execution -- it’s the small details. They made good on their chances and here we are.”
Thomas Chabot gave the Senators a 1-0 lead at 3:46 of the second period. After Stutzle won an offensive zone face-off against Matthews, Chabot’s shot from the blue line deflected off Matthews in the slot past Stolarz’s blocker.
“He couldn’t see it,” Toronto coach Craig Berube said. “So, first of all, we can do a better job off that face-off and we’ve got to have a block there or we’ve got to have guys clearing the net out in front of the net so we can see the puck. One of the two.”
Ottawa maintained its lead at 15:26 when Ullmark stopped Mitch Marner’s shot from the slot.
“Not surprising,” Senators coach Travis Green said of Ullmark’s play. “I feel like I’ve been talking about Linus a lot this series and we’ve got a lot of confidence in him and rightfully so. He was sharp again tonight.”
Dylan Cozens scored a short-handed goal to make it 2-0 at 8:24 of the third period. Matthews attempted a pass from below the goal line to Marner at the point that was intercepted by Adam Gaudette, which led to his 2-on-1 pass in the slot to Cozens, who scored glove side.
“Gaudette made a great read and picked it off,” Cozens said. “It was good poise by him to let me get up the ice and he made a great pass. I just shot it and it went in. It was a great play by Gaudette.”