Use of Paddle and Ball

A player may not carry a second paddle or a second ball during play, although it is permissible to use both hands on the paddle and to switch the paddle from hand to hand in the course of play.
With regard to ball change, play should continue with the same ball as long as it is in good condition. In tournament matches;
Play should continue with the same ball throughout a set, and the ball should not be changed during the set unless.
The ball becomes clearly defective, such as a crack or split in the ball, or.
If, for any other reason, all four players agree that the ball should be changed during the set. Unless all four agree to the change to a new ball, play should continue with the same ball through the completion of the set.
At the end of a set, play can continue with the same ball; however, if any one player desires a new ball, the ball change is made.