Originally Posted by ctjpm
'Serena is tougher than Monica though' = subjective. Serena was never in Monica's position. Monica's mental toughness was legendary and it floored her.
Singles - Graf.
Combined/doubles - Navratilova.
There's no such thing as the greatest of course but it beats writing an essay. Special mention to the two Mo's who couldn't continue to rack up titles.
seles wasn't in hers either....