are tennis balls yellow or green? The 20-time Grand Slam champion was confidant. The debate over the color has gone viral thanks to Federer weighing in. He was in Chicago promoting the Laver Cup ...

What are tennis balls made of ... This is how the seam (the white markings on the ball) is created. If all the cloth used to make the balls during Wimbledon was laid out, it would cover a pitch the ...

For years, players have used ball marks to understand the story of a match on clay. Now, they are being asked not to trust ...