Tennis players often change their rackets during a match. Sometimes they get angry and smash their rackets. But even calm players bring extra rackets with them. The reason is the tension of the strings on the racket. This is important when playing with new balls. The umpire calls for new balls during the match because the old balls lose their speed and bounce. The new balls are faster and bouncier, so players want more control of the ball.
A tightly strung racket gives more control but less power. A looser racket gives more power but less control. Players change rackets because they want the right tension for the new balls. The umpire calls for new balls every 7 to 9 games. So, players bring many rackets with them. They can bring 6 to 10 rackets. This helps them play their best.
Tennis players need to think about the tension of their rackets and the speed of the balls. They need to make sure they have the right racket for the new balls. This helps them play a good game. The players who bring extra rackets are prepared for the new balls. They can play with the right tension and control the ball.