Currently Nadal has a 6-2 winning record against Federer with 4-1 record this year alone. If everything goes according to plan, Nadal and Federer could meet six more times this year (Toronto, Cincy, New York, Madrid, Paris and Shanghai). The first three possible meetings will be on outdoor hardcourt and the later three will be indoors. They're pretty even on outdoor hardcourt with Nadal having a 2-1 record against Federer. These two have never played against each other indoors. I think you would have to give Roger the edge because indoor courts are faster than most other surfaces. If Roger can win all six matchups, then he will have 8-6 record against Rafa and I think Nadal fans would have to shut up about whose better.