Hi I am sorry if this is the nth thread on shoulder pain but I am merely describing some pain not a injury and my own experiences. Basically, I have started playing more singles lately (I previously played doubles exclusively which does not require backhand clears) and I come home and find that my shoulder hurts if I repeat the same motion- from the raised elbow to extending my arm and at the same time supinating my forearm. The pain appears to be near my rotator cuff, on top of the deltoid muscle. The pain usually goes away the next day as I am still under 30. I wonder if this is something wrong with my technique? Moreover, should I be concerned about the damage getting worse? I will be grateful if people can share past experiences and what they did to prevent / heal injury.