I made a system how to convert greatness to numberss. For more details see my post : The Greatness Formula in the Current Pro players forum. It is like this: 13 weeks nr.1 = 1 slam point 1 major = 1 slam point Career slam = 1 slam point Calendar Grand Slam = 2 slam points So for example Federer: 23,2 + 17 + 1 + 0 = 41,2. But I don't have much knowledge of history. How would you translate rankings and slam won from Laver or Rosewall.