Why are tennis players given 3 balls?

Why are tennis players given 3 balls? Tennis players may check three balls or more before serving so that they can select one smooth ball and one fluffy ball. The smooth ball is used for the first serve. Because the hairs are flattened down, the ball travels faster than an older ball, which should make it harder to return.

Tennis players may check three balls or more before serving so that they can select one smooth ball and one fluffy ball. The smooth ball is used for the first serve. Because the hairs are flattened down, the ball travels faster than an older ball, which should make it harder to return.