LOL. I was there for Federer's QF and F wins over Blake & Roddick at the 2006 U.S. Open. Those were both pretty competitive matches.
1. Against Blake, Federer won, 7-6 (9-7), 6-0, 6-7 (7-9), 6-4. Blake had set points in that first set tiebreaker, had several chances at an early break in the 4th set, and had a break point to level the 4th set at 5-5.
2. Against Roddick, Federer won, 6-2, 4-6, 7-5, 6-1. Roddick had Federer in a love-40 hole early in the 3rd set in the match and was right there with Roger until 6-5 in the 3rd set.
Clearly PEAK Sampras was >>>>> Roddick and especially Blake, and both of those guys gave Fed competitive 4 setters at the 2006 U.S. Open. What this tells me is that a PEAK Sampras against the Federer from the 2006 U.S. Open would have been a very competitive match, probably a 5 setter. I think that either player could have taken it.