The above is to highlight a point: There are way too many errors, way too many different struggles (on the return, poor approach shots, etc...), too many different elements that don't click to simply say it's mostly mental. The mental game plays a part when Roger blows leads to Nadal, when, no matter the scoreline, you always get the feeling there's only going to be one winner, when Roger plays bad tie-breaks, when he makes terrible errors on break points, etc... But key points are, in the grand scheme of things, very few (relatively), albeit very decisive. The mental game does not explain why other elements in the match-up that occur at "neutral" moments in the match. There's clearly much in Rafa's game that forces Federer to overthink at times, and I think that's actually the most under-discussed aspect of Fedal matches: They've played 33 times, and yet Federer is STILL unsure what's the best way to approach their matches, tactically.
