Shane Larkin

Celtics take Game 1 of East finals, beating Cavaliers 108-83

The assignment for Boston Celtics forward Marcus Morris in his first start this postseason was easy to explain but nearly impossible to execute.

His job: Guard LeBron James, and keep the four-time NBA MVP from running the Celtics out of their own gym in the Eastern Conference finals for the second year in a row.

"He's obviously the best player in the game," said Morris, who during the week boasted that he was up to the challenge and on Sunday explained why he wanted it.

"Because I'm a competitor. He's the best player, and I'm going to be able to tell my kids this one day."

Morris scored 21 points and added 10 rebounds while pestering...

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