Heavyweight champion Muhammad Ali admires the fist of boxing great Jack Dempsey as they gag it up for the camera at the Boxing Writers' Association's annual dinner in New York on Jan. 17, 1965.

Mike Tyson has revealed his ultimate top four boxers, none of which he has shared the ring with. Former basketball player ...

Muhammad Ali runs during an early morning workout in Deer Lake, Pa., in 1978. ... On the other side are two boulders, painted with the names of Sonny Liston and Jack Dempsey.

From Muhammad Ali to Floyd Mayweather, here is our list of the greatest boxers in the modern era. ... Jack Johnson, Jack Dempsey and countless other formative giants, are ineligible to be ranked.