Which fighters can really say this and get away with it? I'll start with Joe Frazier. Only lost to Muhammad Ali and George Foreman, twice each of course.
I was half tempted to say Oscar De La Hoya. Of course, each guy that beat him was a great fighter...... but in at least two of those fights he beat himself. :think Tommy Hearns only lost to Leonard and Hagler in his prime.
How about Clinton Woods?? Bar the Starie bout, lost to Jones Jnr Johnson Tarver Cloud (jurys out thus far but could be a LHW ruler for some time)
Beat the best Joe Louis that anyone did, was HW champ, beat a lot of good contenders to be fair not many fighters have only lost to the best ever in their division, Foreman isn't the best HW and Frazier lost to him Hatton is the closest to someone losing to the best of the best
I expected that due to the number of fights the old-timers took part in that the majority of the answers to this thread would be mostly modern fighters, but there are a few old timers with great records