I have been playing tennis for over 55 years and have had problems with muscle cramping since I was a teenager. About 3 weeks ago I had to retire when I was ahead 3-0 in the third set of the finals of the ******* Clay Courts Championships. When I went to the Tournament Director to tell him why I was retiring he said takes some Tums. Tums is a calcium carbonate tablet that is used for acid stomach. I took three Tums tablets and was surprised that the cramping went away in a few minutes. Last weekend I was playing in the semi finals of the ******* Hard Court Championships and won the first set 6-3. At 5 all in the second set I started to get hand cramps again. I said to my self if I do not win this set I will retire. Well I lost 7-5, but decided to start the third set, since after a 10 minute break I felt ok, but knew that I probably would get cramps again and have to quit. Luckily for me I sent my wife to the store to get Tums during the break between the second and third sets. I broke serve to go ahead 3-2, but during the change over my hand made a fist that I could hardly open. I took 3 Tums tablets. To make a long story short I went on to win 6-4 As noted I have been fighting cramping for nearly 50 years. I have investigated this issue and found an article in a medical journal that related specifically to tennis: Bergeron MF. Heat cramps during tennis: a case report. [Case Reports. Journal Article] International Journal of Sport Nutrition. 6(1):62-8, 1996 Mar. In this article the patient needed to take more salt prior to playing. I was adding salt to my Gadoraid in the above matches and still got cramps. Maybe I didn’t add enough salt. My doctor is checking my magnesium levels since he said that could be part of the problem. I know that I perspire more than the average and probably loose electrolytes more than most due to more perspiration. What do you do if you get cramps during a big match? From now on I carry Tums in my tennis bag.