Fighters who have never been stopped/knocked down

[Wacko3205]

Winky Wright
Vitali Klitschko
Ike Ibeabuchi
Joe Calzaghe
Jermain Taylor
Arthur Abraham
Floyd Mayweather Jr.
Ricky Hatton
Juan Manuel Marquez

I'm sure that there are more...but those are the only ones that really click right off the button for me as fighters that have never been knocked out...some of those have'nt been downed either.

Sorry...I missed this:

I know guys like Mayweather, Taylor, Tarver haven't been stopped, but they haven't fought the same number of fights as the other guys. Let's make it a minimum of 40 career fights. Who else is on the list?

Before posting my list...but I'll still leave it at that.