Which world champion before Sven Ottke was born on  7 February 1958? 
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. Terry Marsh (boxer): Terry Marsh (born 7 February 1958) is an English former professional boxer who was an undefeated world champion in the light welterweight division.
Terry Marsh