After outscoring the Cavs 42-25 in the 3rd, Boston was held to just 20 4th-quarter points. James' free throw with 36 seconds left ended up being the game-winner. Rajon Rondo missed the potential game-winning shot at the buzzer, but did finish with 16 assists.
Kevin Love had a double-double of 12 points and 15 rebounds for Cleveland, who is now 4-3 on the season. Kelly Olynyk lead the way with a season-high 21 points for the Celtics. Jared Sullinger and Jeff Green added 19 points each for Boston, who fell to 3-5 on the young season.
Iriving began the 4th-quarter charge, scoring 13 of 15 Cavalier points after they trailed 103-84. That cut the deficit to 107-99 with 8:40 left. All of James 10 4th-quarter points came in the final 6 minutes.
Boston's dominant 3rd quarter broke a 59-59 tie at the half. They missed just 6 shots in the quarter.
Cleveland will return home tonight to host the Atlanta Hawks, who took down the Miami Heat Friday. The Celtics will host a talented Phoenix Suns team on Monday night.