Kudos. I opened this thread nigh on certain no one would have cited Bartfield's win over Greb and here you have in the first response. A WW beating arguably the greatest ever MW and one of the greatest ever P4P fighters, whilst giving up 14lbs, and it's hardly ever discussed. It's the definitive answer to the question posed in the thread title, imo.
Steele TKO2 Lesnevich Monzon W 15 Valdez I Monzon W 15 Valdez II Spinks-Holmes I Marciano KO 9 Moore Louis KO 11 Walcott Jofre TKO 4 Saldivar Mayweather W 12 Marquez Sanchez TKO 15 Nelson Duran TKO 10 Marcel