This Sunday I played in 95 deg heat, started getting quad cramps during the middle of my 2nd set, by the 3rd, my quads where locking up, couldn't continue. I though i was prepared, drank 1.5+ gallons of water the day before, and on Sunday I continue drinking water throughout the day. Not sure why, but I do have a history of calf cramps on hot days, but never quad cramps. I'm pretty fit, but maybe not "heat" fit. My diet is pretty good, but I don't consume a lot of salty foods. I never slat my food, and rarely add table salt when making dinner, etc. I've done some research about hydration and decided I'm going to try a product called "nuun". It's a hydration tablet that dissolves in 16 oz of water. I only drink water during play, but am considering using a sports drink, ie gatorade. I really prefer water, not in love with the taste of sports drink but if it will prevent me from getting cramps during play, I'll do anything. Anyone else have any suggestions on what I should do?