Roger lost no sets in 06 before the finals against a tougher slate of opponents than he faced in 08. The way Roger returned in 08 he'd have had plenty of problems with Roddick. Roger wasn't exactly good in the 09 final either and we know how that one was.
Roger in 08 lacked the consistency of prior years and that led to lots of big losses against non-elite players as well. Fed especially struggled in the big moments, 1-13 BP's and blew a 4-1 lead in a must-win 2nd set. Do I think a strong version of Roger handles Rafa on grass that day? Yes, he has a way better game on grass, needless to say, and the matchup issues are especially overblown on that surface. Roger didn't lose that match because of Rafa's lefty spin, he lost because he was badly outplayed in big moments and was especially passive the first two sets.
you know you will be challenged when you make such points. First, let's talk about Fed's 06 vs his 08 run and then talk about the inexplicable phenomenon of Federer always playing bad vs Nadal but not others, it being nothing to do with nadal's quality of tennis.
1. Roger's 06 vs 08 Wimbledon runs. In route to finals in 06, Roger beat Gasquet-Henman-Mahut-Berdych-Ancic-Bjorkman. In 08, Roger beat Hrbaty-Soderling-Gicquel-Hewitt-Ancic-Safin. When you claim that he faced a tougher slate of opponents in 06, as if it's not even debatable. prepare yourself to elaborate. I don't see it and if you will make your arguments, i will counter easily because it is quite easy to make an argument either way.... So i will call BS on this
2. Roger just happens to play poorly vs Nadal, every time. There are a couple of assumptions made here that are quite extraordinary
a. Roger is mentally weak. The fact is that Federer has won 20 slams because he has always been a mental giant, no-onem no matter how talented, does this without being a mental giant. Everyone faces players that matchup rather well against them, Nadal does several things that bother Roger.
b. Roger beats other players because he is able to summon his best all the time. One extraordinary assumption is that he just has dips in his level vs Nadal and no-one else. To believe that Federer has been able to summon his top level against everyone else, all the time, is absurd. Federer regularly beat the likes of Roddick, Hewitt and others on days when he wasn't at his top level, he couldn't do it vs Nadal. No tennis player can wake up every day and play their top top level, it is their ability to win when they are not at their top level that makes them great. There is this extraordinary bar set for when he faces Nadal, he must be at his uppermost level, but this same bar is not set against other players. In the 08 Wimbledon final, Federer didn't seem to be at his top level in first two sets but the level he displayed on that day could've been enough to beat 05 Roddick or 05 Hewitt, it wasn't against Nadal. Roger, did, however, reach his top level in the last 3 sets, he played at an incredibly high level and even so, barely got past Nadal 7-6, 7-6 and then lost 8-6.
Question - when Federer faced 18 year old Nadal for the very first time in their career, ON HARD COURTS, was he already intimidated by Nadal? he lost 3,3 on a masters tournament! This was a sign of things to come, Nadal's game had unique qualities to it that bothered Federer.
3. Nadal's serve was sh&t on grass and his game weak. For whatever reason, Rafa's serve was quite effective during his 08 Wimbledon run, there was no better example than when he faced Andy Murray in quarters. If i recall correctly, Murray couldn't even muster 1 break point! and Murray has always had a great return. I can't explain it but Nadal's serve has been a bit of a mystery throughout his career, he served lights out at USO 2010 (serving 135 bombs regularly) but then suddenly it went away. I will say that on grass, however, his serve has been quite effective, maybe the bounce was different than on hards. His major weakness, to me, has been his return of serve on grass, not his serve. Regarding Nadal's game on grass between 06-08, very underrated. In 06, Federer made finals without dropping a set but lost a set vs Nadal and i remember vividly that Nadal hit 20+ winners in that set, it has an incredible level. In 07 final, nadal pushed Roger to 5 and then in 08 beat him. No matter what you say, Nadal's level on grass during this streak was very high, higher than the level 03 Philipouisis, 05 Roddick showed, CLEARLY. The only exception may be 04 Roddick, who for a set was possessed but over entire match, 07-08 nadal played at a higher level than even 04 Roddick, CLEARLY. Nadal was hitting MANY more winners from the baseline than even 04 Roddick and serving effectively... plus doing things Roddick could never do - cover court and take winners away from Fed.