Thanks, same goes for you
His big-match excellence is so demonstrable that I can't bring myself to believe it's equal parts smoke-and-mirrors. That's what I mean

he plays a game with a lot of margin so I brought that up to acknowledge that there is some merit to the claim that Nadal isn't *as* unflappable as his game would have you believe. But not enough to kick him off the mental strength mountaintop. Of course, this is a matter of opinion and we seem to be reaching an impasse.
I'm not of the opinion that his mental shortcomings are the main culprit in his struggles with Rafa. Nadal, and I've said this before, seems to have been created in a lab to defeat Federer. Terrible match up. Federer is tough as nails and he along with Novak is my favourite active player. If you're expecting me to say something negative about his mental strength, then guess again, because I couldn't do that (expect in a DIRECT comparison w/Nadal or one or two other players in tennis history).
Definitely a parcel of truth to that, but regardless of how skewed the grand slam h2h is, Nadal is 13-1 against the other 3 at RG. That shouldn't be totally disregarded. Twice he came back from a set down to win. Several times, Federer and Djokovic imploded when faced with the prospect of beating Nadal. Case in point: Djokovic in the 5th set of 2013, the third set of 2014 (the casual flubbed volley on BP) and the multiple double faults on championship point.
Moreover, even outside of the French Open (and its silly to throw 14 grand slams in the waste bin), his h2h against them is 12-8, and 7-5 against Fedkovic. Clearly, the last few matches against Federer at Melbourne weren't really indicative of much, as his game was decrepit compared to how it was in his prime. But ask yourself this: in how many of his grand slam defeats to the three, did Nadal lose as the clear favourite? Arguably once, against Murray at the Open. How many times did he win the matches where he was either the underdog or it was a coin-flip? This has to be factored in. While a Federer-Nadal mental strength comparison is at least feasible (w/Nadal having the edge, IMO), a Nadal-Djokovic one doesn't make sense to me; Nole lost too many winnable slam finals and didn't have a high enough conversion rate in slams where he was the pre-tournament favourite.
Again, some of these points are so subjective that it's tough to tell how impartial the other side is (this applies to me as well), but I'll still indulge you here beyond merely stating that I disagree (ill still be wildly subjective, but Ill tell you why I disagree

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As I see it, Nadals inconsistency in the majors relative to Federer and Djokovic are more a byproduct of a game that can be exploited on non-clay surfaces. In many of his early round exits, rather than suffering mental lapses, he got blasted off the court. I'm not remotely surprised that Nadal has lost more before the QF stage outside of Roland Garros. He can't overwhelm lower ranked players in the 3 other majors like Federer and Djokovic naturally can (not as often, at least.)
PS, just in case you think I'm using this as a springboard to argue that Nadal is the best player of his era (not saying you are) : I'm not, as he's not. Clearly that's Federer. The reason I am using big-match success to strengthen my argument is to isolate their mental strength from their pure tennis ability. If I have failed to do that, so be it, but I just want to clear that up.