Gonzales arguably spent more time as the world's no. 1 than anyone else in the history of tennis. That alone is enough to put him in the GOAT equation.
As for Rosewall it depends on how much stock you put in longevity and how you calibrate the majors or their equivalents. Incidentally Pancho is probably his only serious challenger (apart from Tilden) in the former respect.
It's safe to say they both will always be in the discussion.
Last edited by NonP; 01-20-2013 at 02:48 PM.