Here we go again.

With a golden chance to put the Auston Matthews-less Toronto Maple Leafs away for another season in Game 5 at the Garden on Tuesday, the Bruins lost to the Leafs in overtime, 2-1.

Sound familiar?

The B’s followed the first page of last year’s script in their series against the Florida Panthers, coming home with a commanding 3-1 series lead and failing to put away a wounded but desperate opponent. Now they have to travel back to Toronto to try and win a Game 6 to avoid a do-or-die Game 7 on Saturday.

Are the knuckles white yet?

After Charlie Coyle was robbed by Joseph Woll at one end, Matthew Knies scored the game-winner 2:26 in OT. John Tavares drove the net on Matt Grzelcyk, and shoveled the puck on net. It bounced out to Knies, who buried it into an open net behind Jeremy Swayman.

The B’s showed up late to this game.

The game was tied 1-1 through 20 minutes, and the Bruins were oh so lucky for that. They were outshot 12-2 in the first period and Leafs won 16-of-20 draws, keeping the play in the Bruins end almost exclusively.

The Leafs took the first lead of the game at 5:33 after they were the beneficiaries of a borderline icing call on Brandon Carlo. Max Domi beat Trent Frederic on the ensuing draw, Mitch Marner relayed it to Jake McCabe a the blue line and the defenseman’s shot made it through a screen to beat Jeremy Swayman.

The B’s were having a hard time making the simplest of passes and, as a result, the majority of the play was in the Boston end.

But it took just one good forecheck to tie it up. Matt Grzelcyk, who had some shaky early shifts in his first game back in the lineup since Game 2, dumped it into the right corner and Simon Benoit went back to retrieve. Jesper Boqvist harassed him until he coughed it up on the left side. The puck hit Pat Maroon and went right to Frederic in the slot. Frederic buried his third goal of the series on a one-timer past Joseph Woll to tie it at 13:54.

The Leafs went right back to dominating the B’s and, as a result, they took the first penalty of the game, a Carlo crosscheck on Tyler Bertuzzi at 14:53. The Leafs, as they’ve done all series, could not get anything going on the power play and the B’s were able to go into the first break tied up.

The B’s got their first power play 28 seconds into the second period and, despite going into the game at a 6-for-13 clip on the PP, coach Jim Montgomery went back to loading up on the first unit with Brad Marcand, Daviid Pastrnak and Charlie McAvoy. It fell flat once again.

Then they had to kill off a Maroon interference penalty, which they again did again, thanks in great part to a tremendous Swayman save on Morgan Rielly.

The B’s started to get some chances after that, the best of which was a clean break-in by Boqvist but Woll thwarted his five-hole backhand attempt.

The B’s put themselves in a hole late in the period. In the final minute of the period, Marchand turned the puck over at the Boston blue line. That led to a Toronto push and pileup at the net in which Swayman was somehow able to hold the line.

But a scrum broke out between the two teams with a lot of gloved shots thrown, and it was the Bruins who came out of it shorthanded with Charlie Coyle and Marchand – their first penalty-killing forward pairing – headed to the box while only Joel Edmundson went for the Leafs.

The B’s had a couple of great chances to get the go-ahead goal in the third. Charlie Coyle hit the near post on one and, with 7:20 left in regulation, Trent Frederic had goalie Joseph Woll down and out but couldn’t lift it over the pad.

Jeremy Swayman, excellent again, had to make a save on Tyler Bertuzzi on a 2-on-1 with 5:05 left in regulation.