The Bruins showed plenty of gumption, but they could not outhustle their mistakes on Monday at the Garden.

The B’s had their chances to complete a comeback from a three-goal deficit – incurred by a series of their own miscues – but they fell to the Tampa Bay Lightning, 4-3, suffering their first loss of the young season.

Entering the third period down a goal, the B’s pushed hard in the third period but could not get the equalizer.

They now head out for a tough three-game road trip to Vegas, Colorado and Utah.

The B’s had some brutal puck management issues to start the game that would contribute to a 2-0 deficit. Jake Guentzel created two turnovers that led to both goals.

On the first one, the high-scoring winger picked Charlie McAvoy’s pocket at the Boston blue line and the Bolts went

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