The Eastern Conference Finals is now a best-of-three series. The Boston Celtics notched a 93-91 overtime win over the Miami Heat in Game Four of the series. The Celtics have won the last two games to even the best-of-seven set at a two games apiece. The Heat will host Game Five on Tuesday. Meanwhile, the San Antonio Spurs will host the Oklahoma City Thunder in Game Five of the Western Conference Finals Monday night. The seven-game series is also tied at two games apiece. Tip-off is at 9:00 Eastern.