[["While tennis balls can be any color, if they're being used in professional competition, they're supposed to be yellow. The International Tennis Federation made that rule in 1972, and they've stayed that way ever since. The official name for the color is Optic Yellow.", 369.0], ["In professional tennis, the color is known as Optic Yellow. Most amateur players and NCAA events use the same color but you can find other colors in stores or on line.", 98.0]]
what color are tennis balls
sports