Marcus Johansson stuffed his second goal of the game past Frederik Andersen at 6 minutes, 31 seconds of overtime, lifting the Washington Capitals to a series-winning 2-1 victory over the Toronto Maple Leafs in Game 6 on Sunday night in Toronto.

Johansson pulled Washington even at 1-1 with less than eight minutes to go in the third period after Auston Matthews broke a scoreless tie with his fourth goal of the series for Toronto. It was the fifth overtime game of the series, and the record-setting 18th in the first round of the playoffs.

"It was a tough series," Johansson said. "I've said it before, but a lot of credit to them. They gave us everything they had, and we had to work hard for it, and we had to stick with it for a long time. I think that shows a lot of character in our group."

Braden Holtby made 37 saves for the Presidents' Trophy- winning Capitals, who will face the Pittsburgh Penguins in the Eastern Conference semifinals.

Every game in the series was decided by one goal, and Sunday's game was no different. As Washington waited for yet another overtime, linemate Justin Williams turned to Johansson and said, "You or me."

"I've got it," Johansson told him.

With Toronto's fourth line out after an icing, Evgeny Kuznetsov won a faceoff. Williams got the puck and shot toward the net, where Johansson was in front, and Johansson muscled his way past Martin Marincin to score around Andersen.

"He had played great all series and finally got rewarded tonight," Williams said of Johansson. "JoJo, you could just see it in his eyes. He cares, and he wants to win. Tonight, certainly, he wasn't going to be denied."

Ottawa 3, Boston 2 (OT): Clarke MacArthur scored a power-play goal 6:30 into overtime and the Senators beat the Bruins in Boston to win their first-round playoff series in six games.

Craig Anderson stopped 28 shots for Ottawa, which advanced in the postseason for the first time since 2013. The Senators will play the New York Rangers in the second round.

"There's nothing like living in the NHL and living in these playoffs," said MacArthur, who spent almost two full seasons recovering from a concussion.

Bobby Ryan and Kyle Turris scored in the second to give the Senators a 2-1 lead.

Tuukka Rask made 26 saves for the Bruins, who got goals from Drew Stafford and Patrice Bergeron.