 NBA News 3 agency kicked off with a bang with the biggest move coming from the defending champions. The Boston Celtics agreed to a five-year, $314 million contract extension with Jason Tatum, the largest contract in NBA history. Boston also reportedly re-signed guard Derek White for four years and $126 million. Elsewhere, Paul George is headed to Philadelphia on a deal worth $212 million over four years. Philly also re-signed Tyrese Maxey for five years and $204 million.