Previously undefeated fighters (10)

Chagaev 25-0 (Wlad was the first and only one to knock Chagaev down)
Ibragimov 22-0
Brock 29-0 (Wlad was the first to knock Brock down
Peter 24-0
Castillo 18-0
Shaheed 16-0
Vujecic 14-0
Pianeta 28-0 (Wlad was the first and only one to knock Pianeta down
Povetkin 26-0 (Wlad was the first and only one to knock Povetkin down)
Wach 27-0

Plus many who had only ever lost once (Thompson, Chambers, Bostice, Barrett, etc)


Former, future or current world champions: (11)

Byrd (2)
Peter
Chagaev
Ibragimov
Mercer
Brewster
Rahman
Povetkin
Mormeck
Haye


The best statistic on Wladimir Klitschko, though, is HOW MANY OPPONENTS HE'S KOed WHO WERE NEVER STOPPED BEFORE. I believe he's the best of the past 50 years in this category. There are so many:

Thompson (Wlad was the first to knock Thompson down)
Chambers (Wlad is the only one who has ever knocked Chambers down)
Bostice
Barrett
Shultz
Pianeta
Chagaev (Wlad is the only one who has ever knocked Chagaev down)
Shufford
Mercer
Vujecic
Brock
Castillo
Shaheed
Wolfgramme

and several others.

Some who are considered bums now, were highly regarded before Wlad beat them.

Axel Shultz had only close decision losses, and had never been knocked down in his fights against Moorer, Foreman, etc.

David Bostice was regarded as one of the top American heavyweight prospects at the time he fought Wladimir, and had never been stopped or even knocked down before. Wlad put him on the canvas twice in the first and twice in the second. Bostice openly wept in his corner after the fight, and was never the same fighter afterwards.

Paea Wolfgramme had an excellent amateur pedigree, and was physically bigger than Wlad at about 280 pounds. He had never previously been stopped or even knocked down, and had lost only one close decision. Wlad knocked him out in the first round.

Monte Barrett, who was highly regarded at the time, had never previously been stopped or even knocked down, but he went down five times in the fight with Wladimir.

The underrated Tony Thompson had never been stopped or even knocked down before he fought Wlad in 2008 (he had only one close decision loss in a four round fight).


And of course, Wladimir Klitschko won Olympic Gold in the 1996 Atlanta Olympics.