Celtics' Grant Williams was right to bet on himself, and it's looking like that bet could pay off big

Grant Williams was offered a contract extension by Boston Celtics this summer, but it wasn't enough. He's hitting 54 percent of his 3-pointers and 56.3 percent from the corners this season. His 79.7 effective field-goal percentage and 162.8 points per 100 shot attempts are the league's top marks among all big men.

Williams is a key player for the Boston Celtics. He's a role player, but he's worth a lot. The team gives up less points per 100 possessions when he plays. Williams is getting paid well. Boston will pay whatever it takes to keep him. Al Horford is on an expiring deal. Robert Williams III is making $11.7 million next season. The system is very effective. It's second to only San Antonio in terms of pass-and-kick flow. They create five more points a game via assists. Their spacing is tough to defend. There are many players capable of shooting, passing and dribbling.