 The contract in NBA history now belongs to Jason Tatum. He and the Celtics have reached an agreement on a five-year, $315 million Supermax extension. The Celtics also agreed on a four-year extension with Derek White, worth $125.9 million, and they announced that they're planning to make the franchise available for sale. At the end of an era at Golden State, as Klay Thompson has agreed to a three-year, $50 million deal with the Dallas Mavericks,