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What does POT stand for?
Edit: Durr, it's right there in the title. Oops.
Edited by Miss_Desperado If not for this anchor I'd be dancing between the stars. At least I can try to write better vampire stories than Twilight.I don't think there's anything specifically forbidding it, it's just that people are usually way less able to help with fanfic requests because they're so much more obscure than any given media. There's no guarantee that even people that have seen the thing you're talking about will have read the same fanfic that you did.
In any case, have you checked the POT section of AO 3 or, kicking it old school, FF.NET and just tried searching for the tennis player's name in the tags or summaries? Or, other wise, tags like "real person" or whatever. I think that's your best bet for tracking it down!

Basically a fic where a real world tennis player gets in the POT world and Reality Ensues.