Tennis is all about frustration. Likely the most difficult sport to master. Therefore the passion it provokes. I confess, I sometimes have serious issues in dealing with the frustration of giving a 5.0 a sweat on one day and struggling against a 3.5 the next. I consider to have just reached a solid 4.0...or did I? Is it the different pace? Is it because I'm tired? Or is it just plain reality, with which I must just get used to? I think I know the answer, but I'd really like to hear form you.