Competitive tennis huh? I used to play competitively as well. I can't serve anymore though - rotator cuff...
Same problem here, but from a combination of throwing batting practice then playing tennis at the same time. I forgot my age and threw over 150 pitches to the team. Next day I couldn't lift my arm! Then tried to play tennis a few weeks later... Dead arm. I laid off both for almost two years, two cortisone shots later, mostly healed. Now I'm a lot more careful warming up and serving.
Me-LBH, 48 Spouse-WW, 48 Married for 19 years Son, 12 BD #1 - November 1998 (EA 7 months after wedding) BD #2 - November 2015 (same XBF EA) WW filed D February 2016 WW moved out April 2016