Isaiah Thomas scored 53 points — the second-highest total in Celtics playoff history — to help Boston beat the Washington Wizards 129-119 in overtime on Tuesday night and take a 2-0 lead in the best-of-seven Eastern Conference semifinals.

Fiddling with the mouth guard he began using after losing one of his front teeth in Game 1, Thomas had nine points in overtime, when the Celtics outscored Washington 15-5. He is the fifth player in the history of the NBA’s most-decorated franchise to score 50 or more points in a postseason game, missing John Havlicek’s team record by one point.

It was also a career playoff best for Thomas.

John Wall had 40 points and 13 rebounds for the Wizards.

The series moves to Washington for Games 3 and 4 on Thursday and Sunday.

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