But the thing is this. If we remove Nadal, there is only Djokovic one contender for clay. And old Fed to some extent, he had a fluke run in 2011, but in 2009 his clay game declined a lot, I don't count him as a clay contender for past 4 years.
But if we remove Fed, they were plenty contenders for titles in his prime. Nadal, Roddick, even Murray, Nole (07,08 uso, AO), Safin, Roddick, old Agassi, Hewitt, Ferrero. Even some dangerous floaters, Gonzo, Davy, Nalby, Jouzny, Ferrer...
This just proves Feds level was out of this world. At first Hewitt, Nalby, Safin were beating young Fed, but in 2003, Fed developed and his level was crazy. Not just his tennis, his fitness. He was a winning machine playing over 90 matches. Also his mentality, winning tons of close matches.