Returned to tennis 6 months ago after 20 years away from it. Played varsity and local tournaments for 5 years then quit for 20 years. Please let me know hat glaring errors im making, as well as a rough estimate on my NTRP rating (which I know is probably difficult without seeing my entire game in match play). http://www.youtube.com/watch?v=grhOgx68ptU Thanks so much!!!