Well Gaudio'll probably beat Lleyton... he beated him two weeks ago on clay and right now Gaudio's playing an amazing tennis, just having a bit of trouble winning the crusial points but still, pretty good tennis should be enough to beat Lleyton on clay. Still, Potato boy's a fighter so he might win a set or maybe 2, who knows. But i say Gaudio in 4 or 5.
Then Nalbandian against Guga... well that's gonna be a tough match, for sure. But you know, even tho Guga's playing amazingly well Nalbandian has more chances if he's 100% (which, of course, federer wasn't when he was beated by guga). Guga's a great player and he feels very comfortable in RG. The crowd will probably be supporting him so David'll also have to deal with that. I can't predict who wins here... it's a 50% 50% situation.
Then Chela... well Henman shouldn't be a problem for him. He's not a claycourt speciallist when Chela is. I say Chela in 3.
And THE match: Coria vs Moya. Coria will win. He wont give Moya so many oportunities as Tommy did (in the tiebreak for example, or the 3rd set). Besides, Coria won their last 3 matches on clay in straight sets (or very easily at least). Guille's with a better mentally and physically probably.. although this last factor wont be an issue in the match, they're both in a very good shape now. Umm there's not much to say.. i simply have a feeling
Coria in 3.
So to answer your question... at least, 3.