Ball

The round object that is hit back and forth in a tennis game. Balls used to be white, and still are for the most part in England, the reason being partly tradition, and partly because they show up well on grass courts, of which England has a great many. But even traditional Wimbledon has finally succumbed to the yellow ball, which has virtually taken over all ver the world on every surface, because of its greater visibility. There are orange balls, probably even more easily visible than yellow ones, and a combination orange-and-yellow ball, too, but they have never caught on. Balls are sold in pressurized containers of three in this country, and in boxes of four in England.