Steve Forbes(although I'm not sure if he's still a top fighter) and Paul Williams. Vitali has never been KD but has been stopped twice.
Shane Mosley was KD sick by Forrest. Paul Williams hasn't had many fights with top level. But yes, PW is one. Good one.
Mosley was knocked down and badly badly hurt by Vernon Forrest. Close to being stopped, he was saved by the bell on the brink of being KO'd.