Wouldn't surprise me in the slightest if he doesn't win one at all. I don't think his 2007 US Open title win is as big an achievement as many make out, when you consider that he struggled for form all year up until that point, benefited from favourable conditions in New York (soft draw, struggling Nole, tired Murray), and then proceeded to struggle for form post-US Open.
I gather you mean the USO 2008...
Why is it that when Fed wins something, it's always because his opponents were tired, out-of-form, etc... while when he loses, it's NEVER due to himself
suffering illness or an injury? Pretty much double standards, here.
Anyone who witnessed him during the AO this year could see he wasn't well at all. And his post USO-struggles, didn't you notice his back injury?
As for the question - could be anything, ranging from zero to three (RG is only a possibility if Rafa would be injured, and I'm not at all expecting anything the like). Just wait and see. I'll be happy if he takes just one, anything else is an extra.