Sounds like Fed admitted it:
Q. Why were you considering maybe not coming here?
ROGER FEDERER: Because the schedule is quite tough, you know, and I knew that my expectations were not to win the tournament here; they were to survive a few rounds. So that's why I'm not disappointed after this loss, you know. I expected kind of a result like this. I'm actually pretty happy I won a match here.
Q. If you're not necessarily expecting to win, what's the motivation?
ROGER FEDERER: Yeah, I mean, you know, the challenge. You know, try to make it not happen, you know.
Q. Are you at all disappointed? You seem pretty okay with this.
ROGER FEDERER: I'm not disappointed.
http://www.asapsports.com/tennis/2006cincy/081606RF.html