the problem with elo is that under normal circumstances (fed is awesome, not normal) the number 1 wouldnt be a fave on every surface, beating sampras on clay could improve your ranking too much.
Sure, just like beating Nadal on grass..
Forgive my ignorance, but what is elo?
Rating system used, for instance , in chess.. Also used, afaik
, in soccer and rugby world rankings..
The basic difference to existing rankings is that existing system counts only wins. In Elo losses count too and they hurt your rankings. If you do not beat a player whom you are supposed to beat according to the rankings, your rankings go down.
The Wtaworld's poster "Ted of Tedstennis" was running Elo rankings for WTA for quite a while.. I do not know if he is still doing that..