When the motor inside the ball starts to spin, ... Since tennis balls lose their pressurization over time it’s a good use for the flat orbs. Message visor.

Old tennis balls (even flat ones!) can make everyday tasks so much easier — here's how. ... As the balls bounce back and forth inside the machine, they’ll break up the stuffing, ...

The U.S. Open is now in full swing, and nearly 100,000 new tennis balls will be used. Unfortunately, that means thousands of tennis balls will soon be useless to the tournament’s top players.

And the balls have a pop to them that is just as audible on TV as it is inside of Center Court in Wimbledon. ... but they’ve also got new tennis balls to play with any time they wish.