Re: Is the Nadal-Federer rivarly the greatest ever?
Yes, it is the greatest rivalry ever. I like the idea that both are standing in each others way of complete dominance. It's perhaps not quite the same now that Federer finally won Roland Garros, but up until then Nadal was the ONLY blemish on Federers record with the poor Head-to-Head and Nadal standing in the way of Federer completing the career grand slam, and indeed the elusive calendar grand slam. On the other hand, Federer is the one who is keeping a great champion like Nadal somewhat in the shadow. Nadal would have been #1 for 4 consecutive years right now if it hadn't been for Federer. Likewise, Federers results across all surfaces, are making Nadals amazing history making results look somewhat ordinary.
I think the only but about it, is that Nadal-Federer matches are rarely very good tennis-wise (with a few notable exceptions). Federer rarely plays anywhere near his best tennis against Nadal, which is partly due to mental issues, but mostly due to Nadal being a horrific match-up for him.
Proud fan of Olderer, the GOAT.