Celtics deal Grant Williams to Mavericks in three-team sign-and-trade

Grant Williams has a new home.

The Celtics are trading Williams to the Mavericks in a three-team sign-and-trade deal that routes Reggie Bullock and draft capital to the Spurs, while Boston will net two second-round picks, according to multiple reports.

Williams, a restricted free agent, agreed to a four-year, $53 million deal to help make the trade to Dallas happen, per ESPN.

Dallas is also securing two second-round picks in the move, and the Spurs are acquiring an unprotected Mavericks pick-swap in 2030.

ESPN reported that the Celtics will also get a $6.2 million trade exception.

Williams, a 6-foot-6 forward drafted in the first round by the Celtics in 2019, emerged as a consistent contributor for Boston throughout multiple playoff runs, playing staunch defense and averaging 8.0 points on 39 percent 3-point shooting last year.

Boston made the playoffs every year of Williams’ tenure, including three trips to the Eastern Conference finals.

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The forward averaged at least 10 minutes per game in all four of those playoff runs.

With a decision to make about a Jaylen Brown contract extension looming, the Celtics are opting to take their frontcourt group in a different direction, having traded Marcus Smart to acquire Kristaps Porzingis in June.

The Mavericks have been active in free agency this offseason, re-signing mercurial star guard Kyrie Irving and bolstering their rotation by signing Seth Curry, as well as reportedly offering a contract to restricted free agent Matisse Thybulle.

Dallas, which missed the playoffs last season for the first time since superstar Luka Doncic’s rookie year, intends to build a contender around he and Irving after the group flamed out last year following its acquisition of the former Nets guard.

The Mavericks went 9-18 after Irving’s arrival last year and missed the playoffs.

San Antonio, which drafted generational prospect Victor Wembanyama in June, will get Bullock, a veteran forward who has shot 38 percent on 3-pointers over his 10-year career.

Bullock heads to the Spurs after two years with the Knicks and two years with the Mavericks.