VIDEO: Smart pulls Celtics closer to Mavs with buzzer-beating 3-pointer

During the first quarter of Monday's matchup between the Dallas Mavericks and Boston Celtics, the "Boys from Beantown" trailed by as many as 16 points.

Second-year guard Marcus Smart wasn't about to let his team go into the second period with such a hefty deficit.

So, he took it upon himself to close the quarter with a buzzer-beating trey.