I suppose there are worse sounds an opponent can make --some of these are accompanied by smells. :-/
Would someone really go through all that extra footwork just for the sake of squeaking?
"I used to be a fairly good tennis player." --Rod Laver. Favs: Goran, Gasquet, Klahn, Seppi, Fognini, Dolgopolov, Nalbandian, Cornet