" 

  
 ""Greatest"" surely refers to achievements. I don't think anyone believes that Federer is the greatest male player of all time. He may be playing better than anyone before him, but that is an entirely different issue. As for players with only one slam victory, how can they possibly be put on a ""greatest"" list? E.g. Kim Clijsters is a very good player, but not one of the ""greatest"" yet.  "