Bryant Jennings
Kubrat Pulev
Alexander Povetkin
Francesco Pianeta
Mariusz Wach
Samuel Peter
Ruslan Chagaev
Sultan Ibragimov
Calvin Brock
Eliseo Castillo
Najee Shaheed
Zoran Vujecic

Klitschko has taken a lot of "0"s over the years, the most in heavyweight history. He'll be looking for another on Oct 24, namely Tyson Fury.

What was his best so far?