I played today with a lady from Minnesota who spends her winter here in Scottsdale Arizona. She is an amazing player and has played in lots of different areas. Anyways, it was 102 degrees towards the middle of our doubles match. She hit a couple of returns long which was no biggie, but she pulled me aside before the next serve and said "The heat is changing the ball, so we better use shorter back swings." I must have looked confused because she went on to say "that in extreme heat, the heat of the court and the heat of the air inside the ball changes and causes the ball to fly faster and farther so we have to shorten our swings to compensate." I've never been told to change my swing during summer play, but I have heard the heat can speed up the ball. What gives?