Dates: May 23-June 6
Winner: Celtics, 4-2
No series was defined more by two games than this one. Dave Cowens fueled the Celtics' victories in Boston before Paul Westphal and Alvan Adams helped Phoenix bounce back in Game 3. The Suns would survive overtime in Game 4 to send the series back to Boston Garden for a pivotal Game 5 that would seemingly never end.
Nearly marred by a series of officiating and timekeeping mistakes, Game 5 saw the Suns and Celtics battle back and forth for two overtimes, until John Havlicek sunk what appeared to be the winning basket. However, there were two seconds returned to the Suns, just enough time for Gar Heard to fling in a buzzer beater to force a third OT. The Celtics would eventually secure the victory and a championship in the following game.