For tennis ball machines to shoot balls with perfect accuracy and at nearly 100 miles per hour, it takes a series of carefully calibrated parts working together. Here's what it looks like inside.

There’s arguably no better social distancing practice partner than a ball machine. True, you don’t get the live ball benefits—not to mention the trash talk or post-workout adult beverage ...

Tennis ball machines are designed to simulate the experience of playing against an opponent. Using motors and adjustable feeders, they launch balls at varying speeds, angles and spin types to ...