Darius Garland added 22 points for Cleveland, which got some revenge on Boston after the defending NBA champions handed the Cavs their first loss on Nov. 19 following a 15-0 start.
Jayson Tatum scored 33 points and Payton Pritchard 24 for the Celtics, who led 93-81 in the fourth before Mitchell took over. Kristaps Porzingis added 21 points for Boston.
The Celtics played without two starters: Jaylen Brown (illness) and Derrick White (foot sprain).
Takeaways
Celtics: Even short-handed, they pose so many problems with their offensive balance and arsenal of outside shooters.
Cavaliers: Mitchell showed why he's one of the league's best all-around players, shaking off a recent shooting slump (he went 5 of 23 in a loss to Atlanta on Friday) by making every big play down the stretch.
Key moment
With Boston trailing 113-110 with 5 seconds left, Pritchard made his first free throw before intentionally missing his second while hoping for a long rebound. However, he got called for stepping into the lane too early, giving the ball back to Cleveland. Mitchell then put it away with two free throws.
Key stat
Mitchell came in shooting just 40% (42 of 104) in his last five games.
Up Next
Celtics host Miami on Monday to begin a stretch of four home games in six nights, and Cavaliers host Washington on Tuesday.
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