Isaiah Thomas with career-high 52 points, Al Horford gets 21 and the Celtics beat the Heat (videos)

Watch Isaiah Thomas scoring 52 points, including 29 just in the fourth quarter (breaking Boston Celtics all-time record) and Al Horford getting 21 points and four assists as the Celtics take down the Heat for the 20th victory in the season. That's a way to end the year!

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