Question: Sven Ottke is a professional boxer who was the third European boxer to retire as an undefeated world champion, following in the footsteps of what English boxer?
Sentence (from "Sven Ottke"): He was a unified super-middleweight world champion, having held the IBF title from 1998 to 2004, and the WBA (Super) title from 2003 to 2004.
Relevant evidence: No