Broner - Went completely off the cliff after that ass whoopin Maidana gave him Nassem Hamed - got beat up and decided he didnt want that to happen again so he quit Joe Mesi - never physically recovered from the Jirov fight and had to hang the gloves up I dont think Bowe was ever the same after his wars with Evander
Takuma Inoue / Jerwin Ancajas Naoya Inoue / Aran Dipaen or Emmanuel Rodriguez Nonito Donaire / Nordine Oubaali or Simpiwe Vetyeka Lomachenko / Nicholas Walters Martin Bakole / Tony Yoka Yokthai Sithoar / Alimi Goitia Takefumi Sakata / Lorenzo Parra (the rematch) etc...
Gamboa after Crawford.....was never the same afterwards. Errol Spence Jr after Crawford.....cared more about taking care of his horses than rematching a loss. Brook after GGG...... Wilder after Fury 2.........
oh yea, also Vic Darchinyan just never was able to quite have a consistent level of success after the Nonito Donaire loss. Up until that fight, he was 28-0 and had quite the ko ratio
Kovalev Ward 1. Sergei won that fight pretty cleanly but mentally (and physically) was never the same afterward. Ward Dawson Froch Bute Alexander Bradley Garcia Herrera (Danny was never the same) Matthyse Danny Postol Crawford Canelo Bivol RJJ v Tarver Trinidad v BHop DLH v Mosley 2 (DLH just checked out)