TORONTO -- James van Riemsdyk and his Toronto Maple Leafs teammates are well of aware of the offensive depth in their lineup.

Despite falling behind 2-0 after one period on Tuesday night, the Maple Leafs knew they were capable of salvaging a victory against the Buffalo Sabres.

Van Riemsdyk's netted the game-winner on a third-period power play, stretching his point streak to a career-best eight games and securing the Leafs' 4-3 win over the Sabres.

"We have a lot of depth up front and a lot of balance throughout the lineup," van Riemsdyk said. "When we get in those situations, we just know we've got to stick with our game plan, stick with what works and we'll get some chances and hopefully we can bury them."

Toronto (21-13-8) earned its third win in a row while improving to 9-1-1 in the past 11 games. Buffalo (17-18-9) lost for the third time in four games.

Leo Komarov, Matt Martin and Auston Matthews scored the other goals for the Leafs, while Frederik Andersen made 24 saves for his 19th win of the season.

Kyle Okposo, Evander Kane and William Carrier found the back of the net for the Sabres. Buffalo goalie Robin Lehner was pulled after allowing three goals on 16 shots. Anders Nilsson stopped 15 of the 16 shots he faced in relief.

Carrier pulled the Sabres to within one with 2:23 remaining in the third period, redirecting a Zemgus Girgensons feed out of mid-air and past Andersen for his fourth of the season, but that was as close as the Sabres would get.

"We've just got to find a way to string a few (victories) together," Okposo said. "It's up and down: win one, lose one; win two, lose two -- we've just got to find a way to use that speed and play a full 60 (minutes)."

After Buffalo scored both of the first-period goals, Komarov got the Leafs on the board 32 seconds into the middle period, redirecting a Nazem Kadri shot past Lehner for his eighth of the season. Martin tied the game 2-2 at 8:29, beating Lehner with a shot from the corner while on the goal line.

Matthews gave Toronto its first lead of the night, taking a Zach Hyman feed and beating Lehner with a wrist shot over his blocker at 9:45. With his 22nd goal of the season, Matthews now leads all rookies in goals and points.

After allowing three goals on seven second-period shots, Lehner was replaced in net by Nilsson. As he was leaving the game, Lehner was seen exchanging words with coach Dan Bylsma. Once on the bench, Lehner slammed his mask to the ground in frustration.

"In 10 minutes, we're going from up 2-0 to down 3-2 in the game, and just an unfortunate turn of events of how that second period was played out," Bylsma said. "(Lehner) should be upset with getting pulled, and that's part of Robin's game, that emotion. I have no problem with that."

Van Riemsdyk doubled Toronto's lead with 6:56 to play in the third, beating Nilsson above the shoulder from the side of the net for his 16th of the season.

Okposo opened the scoring after picking off an Andersen clearing attempt and beating the Leafs goalie glove-side at 10:16 of the first period for his 13th of the season.

Kane doubled Buffalo's lead with 33 seconds to play in the period, one-timing a Brian Gionta feed underneath Andersen's left pad for his 12th of the season.

The Maple Leafs blue line endured a major blow in the first period when Morgan Rielly sustained a lower-body injury. Rielly was tripped by Carrier and fell awkwardly into the boards.

"We've had lots of success this year with no injuries," Leafs coach Mike Babcock said. "Our medical staff has done a real nice job. But injuries wear you down, and then what happens when you get injuries is you play fewer guys more and then it usually leads to more (injuries).

"We've got to manage this well. I don't know if he's out a week or 10 days or a month. I don't have a clue."

NOTES: Buffalo LW Tyler Ennis missed the contest for precautionary reasons as he continues to recover from a sports hernia/groin surgery, which forced him to miss 30 games prior to his return to the lineup on Monday. ... The Maple Leafs recalled D Frank Corrado from his conditioning loan with the AHL's Toronto Marlies on Tuesday. ... Buffalo C Cal O'Reilly was recalled from the AHL's Rochester Americans on Monday and started Tuesday's game on the fourth line. ... Sabres D Cody Franson played in his 500th career NHL game. ... Maple Leafs F Josh Leivo was a healthy scratch for a second straight game. ...The Maple Leafs continue their four-game homestand on Thursday against the New York Rangers. ... The Sabres return home to play host to the Detroit Red Wings on Friday.