I am currently playing with a Yonex RDX 500 1 is strung with Ashaway monogut 16g 60lbs and the other one with monogut 17g 54lbs. The injury occurred about a month ago. When i started serving I would feel a pain around my tricep area. The is no pain in the elbow region just the tricep area. I usually play 1 or 2 times a week for a couple of hours each time. I've tried taking about 10 days off to let it heal but it would feel fine for one sessions and than it would happen again. There is no pain when I am hitting my ground strokes. It only comes about when I try to serve. The pain is not as bad if I use a slice serve but when I try to serve flat thats when its the worse. I've searched everywhere but can't seem to find anything about this problem. Right now the first culprit would be my strings. If anybody has a similar problem or suggestions please help me!!!!