Do Balls Matter?

The more specific question to which I have been asked is, "Does temperature effect the speed of a tennis ball"? The short answer is yes. I have included a link that explains the amount of air pressure inside tennis balls and how they are affected by hot and cold. 
Read more: http://wiki.answers.com/Q/Does_temperature_effect_the_speed_of_a_tennis_ball#ixzz1Fp7mCrfi

Since temperature does affect the performance of the tennis ball; what are some things to remember on the way to the court so that you can get the most out of your power tennis serve? First, always try and be prepared and purchase your tennis balls before the match to ensure they have a chance to reach and stay at room temperature. Secondly, do not leave your tennis balls in the trunk of your car. If you play early in the morning, they will be cold. Lastly, I have placed my tennis balls in the back window of my car on the way to the match to warm them up by the sun. Remember; if you want “The Monster Serve” deploy all tactics necessary to gain an advantage. By taking the time to ensure the tennis balls are at the best possible temperature to bounce the highest, you will allow your power tennis serve to get off to a good start also.