Some names I can think of is Ian Thorpe, Michael Phelps, Kieran Perkins, Grant Hackett, That russian bloke umm...Alexander Popov (that's the one haha), Pieter Van Den Hoogenband (or Hoogie).

It would be a sick race, to see Hoogie, Phelps and Thorpe in the pool at their best. I reckon all three could potentially break the olympic/world record finishes.

Honorable Mention. Willy Benson.

But Definitely Phelps number one.

As much as the guy annoys me, I'd have to say Phelps is the No. 1 male swimmer of the modern era.

1 phelps
2 thorpe
3 popov
4 hackett
and no.5 is a tough one but il go for hoogie.

I think cesar cielo will be in that list within the next few years though