Boxers who picked up the sport late and were successful, the obvious ones are Martinez, Nate Campbell, Marciano, Qawi.
Anthony Joshua is a late starter we will see how he gets on. I know you mean boxers who have had a bit of a career but I just thought i'd throw that one in
Tarver. He boxed a tiny bit when he was young but stopped in his teens, then resume in his early 20's after having a kid and a cocaine addiction.
Lyle won the AAU National Title by knocking out Duane Bobick in like 30 seconds . he was a national champion......
mundine went from professional rugby to boxing at 25. 4 amature fights. should get the win against mosley in two weeks.