At least starting from 72 or 73. I know they used the computer for a while, and it made some #1's when they may not have been otherwise (connors in 77, agassi in late 95), but when did they switch to the current ranking system, and how did they do the switch (slowly let old points fall add new points, or just switch immediately in one week). I looked up the point roddick had as world #1 in late 03, and it was something like 3000 or 4000 which isn't possible because roddick had atleast 2 slam sfs (720 each) a slam (2000) and 2 masters (1000 each), making 5440 points right there. Did they use another ranking system inbetween the computer rankings and the current system? Can someone please explain this to me.