I think it affected him all year round losing to Simon Stephanek Nadal Blake Fish. He had to wait until april to win his first tournament ....a ATP 250 in Estoril. 2008 was the only year he lost in RR at WTF. So please stop bullshitting by supporting Bull Cheat.Lol at people talking about Nadal fans with the complex. Sorry dude, no one obsesses over their hero the way Federer stans do. You can tell it's grass season by the amount of trolling that goes on here.
Anyways, I'll go with Mono. Federer hadn't lost a set going into the Final but that's because his mono only affected him in the Final.