Who has Rios even at his best beaten? Only Agassi at the 98 Miami really. Agassi was nowhere near his best here, he was only starting to work his way up from dropping out of the top 100 at the end of 1997. He wouldnt even get past the 4th round of any 1998 slam event so he was far from his best at this point, and that is Rios's only ever big win. To put Rios in the same sentence of any of Sampras, Federer, Agassi, or Safin, as far as peak level of play is a true joke. By the way I started following tennis closely in 1990, and I have seen Rios play plenty of times, including when he was at his very best. He is no Safin in terms of natural talent, ability to take down the biggest guns at his best, or accomplishments.
LOL the fact that he thinks Rios at his best could even beat Federer at his best is preposterous. Federer beat Rios in 2002 twice, well before Federer's prime. Heck, he 6-2ed him in the last set they played against each other.
And he somehow thinks Rios could have beaten Federer in 2005. LOL.
Here, let me show you a glimpse of what would happen.
http://www.youtube.com/watch?v=DXXMnsDODx4&translated=1
That's a pre-prime Federer also.