That opportunity falls to William Nylander, who will skate alongside Auston Matthews and Andreas Johnsson for the second game in a row. They failed in agonizing fashion, building a 5-2 lead in the second period but failing to protect it in what turned into a devastating 7-6 regulation loss.
Chicago went ahead 1-0 at 3:19 of the first when Keith's blast was deflected by Nylander, rattled around between Andersen's pads and just slid over the line.
The Leafs will look to bounce back after falling 6-2 to the Lightning in the opener of a three-game homestand.
The Blackhawks made it 2-0 at 12:55 when Perlini cut into the middle and whipped a knuckling shot on Andersen for his 12th, and fifth in the last four games.
Tavares lost the puck at the offensive blue line, leading to a 2-on-1 break the other way that saw Patrick Kane feed Kahun, who buried his 12th with 2:47 remaining in the first. With Delia in net, the Blackhawks and conference-worst defense allowed Toronto to rip off four straight goals and storm back to produce an unexpectedly exciting finish at Scotiabank Arena.
Tyler Motte scored two goals 11 seconds apart in the second period and host Vancouver beat NY as the Canucks posted only their fifth National Hockey League win in the past 18 games (5-10-3), while the Rangers took their eighth loss in nine outings.
Saad was left all alone in front to tuck his 23rd with 1:14 left in the period as four Toronto players were caught puck-watching.
Andersen was replaced by Sparks to start the second, marking the first time in his career he's been pulled in consecutive games.
Colliton said he was told by head trainer Mike Gapski between periods that Crawford was not feeling well.
Johnsson scored his 20th this season on a tip-in of Rielly's shot from the left point at 18:27 of the second. The Philadelphia Flyers are averaging three goals per game and are scoring on 17.1 percent of their power play opportunities.
Playing the 200th game of his career, Matthews brought the Leafs a little closer at 7:57 of the third when he banked in his 32nd.
"That being said, moving forward, it's not a start that we want to repeat".
"We didn't put ourselves in a very good position", Rielly said. "But first and second [periods] I think we did some good stuff".
NOTES: After being held out of the lineup Monday for precautionary reasons because of an illness, Toronto announced Kasperi Kapanen has been diagnosed with a concussion.
The Philadelphia Flyers and Toronto Maple Leafs meet Tuesday in National Hockey League action at the Scotiabank Arena. The Leafs will play in Ottawa against the Senators on Saturday.