Lots of boxers have retired (or been stopped by the doctor) in their corner between rounds in title fights. This happened to Vitali Klitschko both as challenger (Lewis) and as defending champ (Byrd). Name other boxers who, like Vitali, retired between rounds in world title fights - both as challenger and defending champion.
Liston quit on his stool, so did Kostya Tszyu (although this is forgivable since he came for a boxing match not a wrestling contest),
