herc, re: prime Federer vs prime Sampras on grass - I think I can go with 5-2 as you suggested last night. I know Andy wasn't in superb form at the AO but the way Federer was serving in that match, even Andy, a great returner was having problems breaking Federer's serve. I do think a great serve trumps a great return. And Federer has half the return game as Agassi so I don't see how he'll be able to break Sampras' serve when Agassi wasn't able to do it. And it's going to put a lot more pressure on Federer's own serve. Add the mental strength on clutch moments and Sampras comes on top again. Even if Federer gets a break point, there's no telling if he'll be able to convert it since Sampras was very good at saving breakpoints with either Ace or nonreturnable serve. I see Sampras trumping Federer on grass, hard, and carpet. I give clear edge Federer on clay. But on an one on one basis where things matter on that single match, you never want to count a prime Sampras out, as he has beaten the likes of Muster, Courier, Brugerea on clay at RG. Personally I do think Sampras would come on top over the likes of Federer, Nadal, Nole etc. on most surfaces.