 winning four championships with Golden State. Now a Dallas Maverick on a three-year deal required a sign-and-trade involving the Hornets who received forward Josh Green from Dallas while sending a pair of second-round picks to the Warriors. Boston Celtics signed star Jason Tatum to the biggest deal in NBA history, a five-year contract extension, $314 million. Boston also extending the contract of Derek White for four years at $126 million. Former Hornets forward Nick Batum, two-year deal to go back to the L.A. Clippers after playing last season with the Sixers.