The Boston Bruins let a massive opportunity go by the wayside Sunday night.

With the No. 1 seed in the Eastern Conference on the line, the Bruins fell to the Florida Panthers 4-2 in their regular-season finale at TD Garden.

After the game, Boston head coach Bruce Cassidy acknowledged disappointment in how his team played out of the gate, but he stressed that one game won’t┬ádefine the B’s as they embark on the Stanley Cup playoffs.

For more from Cassidy, check out the video above from “Bruins Overtime Live,” presented by Ace Ticket.

Thumbnail photo via Bob DeChiara/USA TODAY Sports