Hill and the film’s director talked about the time a team of college basketball players beat Michael Jordan, Larry Bird and Magic Johnson — and...

In tournaments, the old balls are swapped for new ones after several games. Those livelier new ones can change a player’s strategy.

The practice was long banned, but a change in the rules has permitted hand signals and some talking.

Coaches say winning quicker rallies is crucial to winning matches. It’s “the No. 1-indicator of winning and losing.”

It was once considered a desperate shot, but experts say it can give players an edge. Coco Gauff and Carlos Alcaraz use it.

It is usually the most powerful, but that greater strength may also be its greatest weakness. It can break down under pressure.