[Thorsten]

I find it very odd to call oneself a genius, even if the term applies (which is arguable). If Waldner had the literal meaning of the word genius in mind, he was rightof course, but it usually connotes more than merely exceptional natural ability. A genius has a very profound impact on the their field of expertise (for lack of a better term).
Waldner might be the best tt player ever, just as Micheal Jordan, Pete Sampras, Steffi Graf, Muhammad Ali, etc in their respective sports , but geniuses ?( I have yet to hear Micheal Jordan calling himself a genius).

Saying that you are gifted is confidence, but calling yourself a genius is arrogant.