 The NBA champion Celtics are ready to extend one of their big stars. Jason Tatum gets five years and $314 million. If that sounds like a lot, it's the biggest deal in NBA history. Boston also extended guard Derek White for four years. Klay Thompson is on his way to the runner-up Mavericks after a sign-and-trade deal with the Warriors, where Thompson has played his entire 13-year career winning four rings. His new three-year contract is worth $50 million.