New Delhi, July 2 -- Mitchell Robinson rode a custom monster truck down the Canyon of Heroes two weeks ago as a champion. On Wednesday, he signed with the team the Knicks fear most.

Robinson has agreed to a three-year, 47.4 million dollar contract with the Boston Celtics, according to a report from ESPN's Shams Charania, using Boston's full non-taxpayer mid-level exception and including a player option in the third season. It is the first true free-agent decision of his career, and New York's longest-tenured player made it by leaving.

Free agent center Mitchell Robinson has agreed to a three-year, $47.4 million deal to sign with the Boston Celtics, with a player option in third season, sources tell ESPN. Robinson departs the Knicks afte...