The tournament has previously donated tennis balls to conservation groups that turn them into homes for harvest mice, but ...

This viral optical illusion picture is making the rounds on the internet, asking readers to find the hidden tennis ball among ...

Not All Tennis Balls Are Equal. In tournaments, the old balls are swapped for new ones after several games. ... Anders Bjuro/Agence France-Presse, via Tt News Agency/Afp Via Getty Images ...

Tennis players everywhere are running into shortages of tennis balls in their local stores. Getty Images/iStockphoto “Tennis warehouse is back ordered, and the prices of 24 pack cases are higher ...

An easy tennis ball test can gauge grip strength. Getty Images There are a few ways to gauge grip strength — such as a pricey handgrip dynamometer and the hanging bar method .

You know it's a tennis ball. Computers with the latest image labeling algorithms don't have the contexual wits to know a lemon is very unlikely in this scene.

Go for gold with these sporty action shots! Here's how to achieve mesmerizing water spinning from tennis balls mid-air ...

Green tennis balls. Green balls are stage 1 balls. According to the ITF, the intention is for players to progress from using stage 3 (red) balls to stage 1 (green), and then on to the standard ball.

Tennis balls must measure from 2.57 to 2.70 inches in diameter and weigh between 1.975 and 2.095 ounces, leaving a bit of wiggle room for differences. ... TIMOTHY A. CLARY/AFP/Getty Images.

Balanced hobby: Tennis-ball pyramids created by Andria Rogava, a physicist and tennis player. (Courtesy: All images Andria Rogava) As you might expect, a four-level pyramid has a triangular ...