Watch: Kyrie Irving scores 21 points in third quarter vs. Celtics, ties Cavs record

Kyrie Irving caught fire in the third quarter of Game 4.

Cleveland Cavaliers guard Kyrie Irving was a man possessed in the third quarter of Game 4 of the Eastern Conference Finals against the Boston Celtics.

Irving scored 21 points while shooting 9-for-10 from the floor and then two-of-three from beyond the arc. His 21 points in the quarter tied the Cavaliers postseason record for most points in a quarter, which LeBron James achieved in 2010.

Watch some of Irving's best moments below:

Uncle Drew's favorite spot to cap off a dominant 3Q. #NBAPlayoffs pic.twitter.com/ijeZYqTDbL

— NBA on TNT (@NBAonTNT) May 24, 2017

34 points and counting for Uncle Drew! #DefendTheLand https://t.co/s8FjLxW8jl

— Cleveland Cavaliers (@cavs) May 24, 2017

Uncle Drew took over in the 3Q with 21 points! #NBAPlayoffs pic.twitter.com/BPP1wEzha1

— NBA on TNT (@NBAonTNT) May 24, 2017

The Cavaliers came back to take the lead in the second half after recording a 32% field goal percentage in the first quarter.

The Cavaliers lead the series 2–1.