Boston hung around for the first three quarters despite turning the ball over constantly and getting absolutely no production from its bench, but when the fourth quarter started with a 10-2 Thunder run, the game was all but over.
Paul Pierce had a great game, but Kevin Garnett was disappointing, which served as the difference in the game. Boston's center went 5-of-19 from the floor and couldn't buy a basket either at the rim or on his bread-and-butter mid-range jumper. Avery Bradley was a bright spot, holding Russell Westbrook to a 5-11 offensive effort.
The Celtics turned the ball over 18 times on Sunday, which is way too many against a team as offensively dangerous as Oklahoma City.