The Dallas Mavericks and restricted free agent forward Grant Williams are finalizing a four-year, $53 million contract as part of a three-team sign-and-trade agreement with the Boston Celtics and San Antonio Spurs, sources told ESPN's Adrian Wojnarowski on Wednesday.
San Antonio will receive forward Reggie Bullock and an unprotected first-round pick swap in 2030 from Dallas, while both the Celtics -- Williams' former team -- and the Mavericks will receive two second-round picks, sources said.
The Celtics also will get a $6.2 million trade exception, per ESPN's Bobby Marks.