Originally Posted by mib
Sampras recently (a year or two ago) played an exhibition against Federer and looked very competitive (admittedly on a very fast indoor surface). Still to think that even rusty and older Sampras would lose to any player outside of the top 1000 is far-fetched. In fact, considerably older McEnroe would do very well against top college players.
Don't put too much faith in exhibitions. Players are supposed to look good in those. The idea that someone who retired 10 years ago could play a competitive match against the world number 1 is dubious at best.
That said, I would agree that the list of players outside the ATP tour that could beat Sampras would be very small.