18 >>>>>>>>> 10
Don't see a rivalry there. If they were born in the same year, Nadal would have a lot more slams. Too bad Noserer fluked so many slams in a weak era, where his main opponents were Hewitt (18-8 overall, 9-0 in slams) and Roddick (21-3, 8-0). He's also had to beat giants like Baghdatis and Gonzales in Slam finals, true GOAT this Federer.
federer is GOAT because in his prime, he made the players look like mugs, even though they were good. if you make someone look like a mug, you know you did a good job. roger's prime was really in a very strong era. One of the strongest eras ever, imo.
Dull only won 18 matches because he is a bad match up for roger. that doesn't diminish roger's achievements. dull is also a cheater, by the way.
Look at olderer now. he is challenging/beating the players in their prime (dull, djoko, mugray). he would crush them like bugs in his prime.