Andersen was making his third start, having allowed nine goals in his first two. He did not dress for a 3-2 win against the Ottawa Senators on Saturday so he could rest and work with goaltending coach Steve Briere.
"A little new thing we were trying," Andersen said. "Me and Steve Briere got some good extra time on the ice to work on a few things we were talking about the night before. I thought it was good."
Maple Leafs coach Sheldon Keefe said, "I don't know how much we can attribute his [strong play] to [the game off]. It's easy to say because that's how it turned out, but it was his best game for sure, the way he tracked the puck and looked super calm in there."
Tavares put Toronto ahead 1-0 on the power play when he one-timed a pass from William Nylander in the slot at 5:28 of the second period. The center has six points (three goals, three assists) in four games to start the season.
"I think he's skating really well, he looks really confident with the puck," Keefe said of Tavares. "He looks quicker to me than he did at any point last season. He's got a little extra step whether that's on the rush, coming out of the corners in the offensive zone to attack the net or coming back into our zone. He looks to me like he's got an extra step this season, and that's serving our team very well."
Marner extended the lead to 2-0 at 18:39 when he poked in the rebound of Justin Holl's shot, but Connor scored from the low slot to pull Winnipeg within 2-1 34 seconds later at 19:13.
"Speed, breaking out of the zone quickly, finding easy exits, we were really communicating a lot and controlling the puck in the offensive zone," Marner said. "When they were exiting, they seemed fatigued and couldn't really forecheck our defense that much. We've talked about wanting to get better at that every game, and I thought in the second period we really took over and did that well."
The Maple Leafs outshot the Jets 22-6 in the second period.
"It wasn't our best period of hockey," Connor said. "I think all night we were kind of looking for it. It's a good thing about the NHL, we've got a game back to back, so we'll kind of forget about that one. For as bad as we played, we were only down one goal going into the third period. I thought we put up a good fight in the third."