Celtics' Grant Williams fined $20K for punching basketball

The NBA fined Boston Celtics forward Grant Williams $20,000 for punching a basketball into the stands.

The incident occurred with 1:52 left in a 123-107 loss to the Golden State Warriors on Saturday in San Francisco.

Williams was standing at the foul line during a break in play when the ball bounced toward him off the backboard. He knocked it into the seats with a closed fist, earning a technical foul and an ejection.