Joe Louis
Rocky Marciano
Muhammad Ali
Larry Holmes
Wladimir Klitschko
George Foreman
Evander Holyfield
Mike Tyson
Jack Johnson
Jack Dempsey

How's Joe Louis NOT #1 He has the most consecutive successful title defenses as heavyweight champion, he lost 3 years of his career to World War II, he beat anyone and everyone in his era.

Rocky Marciano, didn't have the greatest era to fight in, BUT he made up for that by winning every single fight as a professional.

There's no way at all that those two fighters should not be #1 & #2 all-time