Karlsson's sixth goal of the season, on a one-timer through traffic set up by Kris Letang, gave Pittsburgh a 3-2 lead.
“We stuck with it, got some big goals from some different guys,” Karlsson said. “The third, I think we weren’t afraid to go out there and play to win this game instead of being scared of losing it. It was a step forward for us.”
The Penguins were outshot 12-3 by the Maple Leafs in the third period but maintained the lead after allowing the Sabres to score three straight goals in the third Friday.
“I think we just defended a little bit harder,” Pittsburgh captain Sidney Crosby said. “We probably did a better job just making better decisions that didn’t allow them to get odd-man rushes or clean looks. When they did, ‘Jars’ made some big saves.”
Bertuzzi put Toronto ahead 1-0 at 3:59 of the first period, scoring at the right post on a rebound from John Tavares.
Guentzel took just 28 seconds to answer, tying it 1-1 with his seventh goal of the season at 4:27. Drew O’Connor passed from the high slot to Guentzel at the right post to tuck a shot into an open net.
Knies gave the Maple Leafs a 2-1 lead at 7:48. The rookie forward scored his sixth goal of the season on a rebound off Calle Jarnkrok’s wrist shot from the slot on a 3-on-2.
“I think they were a little heavier and played consistently throughout the whole 60,” Knies said. “I thought we were sloppy in the second period, just kind of gave up the chances. I thought we were chasing a little too much.”