Check out this new tennis series that promises to be a better rendition of POT than POT actually was:
Baka-Updates Manga - Giant Step
Giant Step is a shounen, sports comedy. With it's relation to Prince of Tennis being in some of the art of attacks and their relation to tennis. If you have already read Prince of Tennis or even a little bit of it and it was too serious for you then Giant Step would be good to check out.