HAHAHA. Stop it.
Federer played so bad in the first set, that threads from even the neutral fans made threads asking whether Federer was playing his worst tennis ever. And to be fair he was. And even in 2006, Davydenko played tennis of his life against an underpar Federer and still only managed to win the set 6-4. I mean, you're acting like Davydenko has godlike ability, so at his best and Federer's worst he should win comfortable, like 6-2 or 6-3.
And Davydenko lost in 2007 in straight sets. So even if he was playing his best tennis in just one set he still lost.
I'm starting to think that no one has actually watched a tennis match in 2005. Federer played awsome, Nadal was brilliant and had higher and more consistent levels than Davydenko ever will. Safin actually managed to outhit Federer that year (unlike Davydenko who couldn't outhit Federer playing his worst tennis since 2002 and got bagelled) for 5 sets consistently. Davydenko might be able to play a few good games but seriously, what good is that.