What happened: Mikel Brown Jr. tied the game at 117 with 0.2 seconds remaining in the fourth quarter in Boston. The Celtics took possession after the basket, and the game moves to overtime.

Why it matters: With 0.2 seconds on the clock, Boston's last possession allows only a tip or a catch-and-shoot attempt. Brown's tying shot is what sets up the extra period in a regular-season game at TD Garden.

What to watch: Overtime in Boston decides it, and Brown stays in the spotlight if Brooklyn needs another late basket.