Not sure if this has been broken down but it is interesting.
Clay: Nadal 13-2 Federer
Outdoor hard: Nadal 8-5 Federer
Indoor hard: Federer 6-1 Nadal
Grass: Federer 2-1 Nadal
So outdoors its Nadal 22-9 Federer. All the Majors are outdoors albeit three do have a roof so if Nadal and Federer play and roof is closed Federer will be favourite. But if not closed Nadal is favourite.
What puzzles me is ive read the h2h is clay skewed. Looking at the above thats inaccurate as they have played less than half their matches on clay.
Clay: Nadal 13-2 Federer
Outdoor hard: Nadal 8-5 Federer
Indoor hard: Federer 6-1 Nadal
Grass: Federer 2-1 Nadal
So outdoors its Nadal 22-9 Federer. All the Majors are outdoors albeit three do have a roof so if Nadal and Federer play and roof is closed Federer will be favourite. But if not closed Nadal is favourite.
What puzzles me is ive read the h2h is clay skewed. Looking at the above thats inaccurate as they have played less than half their matches on clay.