Wlad Klitchsko and Floyd Mayweather- both still at the top of their game.

The 96 Olympiad was not the most successful for boxing, the 1988 one was even more successful- and probably thee most successful one of recent memory- but it was still a fairly decent class.

So sad most of them funked out.

See here:
Boxing at the 1996 Summer Olympics - Wikipedia, the free encyclopedia