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 made 21 successful title defences, and was the third European boxer to retire as an undefeated world champion, after Terry Marsh and Michael Loewe; Joe Calzaghe later became the fourth.
Relevant evidence: Yes