Following the four-goal loss, Toronto needs to address some key issues before Game 2 on Saturday (8 p.m. ET; NBC, CBC, TVAS). At the top of the agenda: Fix a penalty kill that finished No. 11 during the regular season (81.4 percent), but gave up three power-play goals to Bruins on six opportunities.
"We were outscored 3-0 on special teams, three on the PK," defenseman Ron Hainsey said. "That's most likely never going to get it done."
Hainsey, 35, would know, having led the NHL in average shorthanded ice time during the regular season (3:58 per game).
"The other thing is, there was not nearly enough offensive zone time for us. It felt like we spent the vast majority of the game on our half of the ice," Hainsey said. "We weren't able to get any long, sustained pushes in their end."
Another pressing issue was lack of discipline. Toronto took 23 minutes in penalties; Boston took six. Included in Toronto's tally was a five-minute charging major and game misconduct to forward Nazem Kadri at 8:18 of the third period.
Kadri will have a hearing with the NHL's Department of Player Safety on Friday.
"It's always a fine line," Hainsey said. "They're going to call penalties out there. It's not a free-for-all. You want to stay out of the box as much as possible. Their power play made us pay, and that's what they're supposed to do when you take penalties."
Feisty players like Kadri and Marchand like to get under the collective skin of the opposition, but Toronto coach Mike Babcock said players have to know not to cross the line.
"The bottom line is you've always got to be disciplined at all times," he said. "I think emotion is real important in the game, but it's got to be controlled."
The 2017-18 Maple Leafs set a Toronto record for points in a season (105). Babcock said it wasn't a fluke, no matter how lopsided the score was in the opener.