Fighters of past eras routinely fought far more often than modern fighters. On top of that, they didn't participate in modern cherry picking, and therefore had more "flawed" records. What modern day fighters have similar records that could be misleading to the uninformed? Glen Johnson comes to mind, at 47-11.
Nooo. Not what I'm looking for. GOOD fighters with a higher than the norm (For today) amount of losses. Evander Holyfield comes to mind as well.
Loads then; Roger Mayweather; Roberto Duran; Oscar de la Hoya; Tommy Hearns; Ray Leonard; Kevin Kelley, hell Nassem Hamed and Ricky Hatton have too many defeats for the current market and fans.
Harold Brazier comes to mind, but I don't know what his final career tally looks like. Mike Weaver is another guy with a very patchy record for a former champ.