What active fighters have the toughest resumes?

[White_Knight]

Everett "Bigfoot" Martin has taken on some challenges over the years:

Dwight Muhammed Qawi
George Foreman
Pierre Coetzer
Bonecrusher Smith
Michael Moorer
Rid**** Bowe
Tim Witherspoon
Tony Tucker
Larry Holmes
Herbie Hide
Tony Tubbs
Lance Whitaker
Wladimir Klitschko (x2)
Lamon Brewster
Ruslan Chagaev

[M Bison]

Sven Ottke and Joe Calzaghe.