Zarate after the Pintor decision. Leonid Dorin lost his passion be4 the Gatti fight. He was still a pretty young man.
Why Spinks he retired at the right time. He wasn't going to make Light Heavyweight anymore and there was no money at Cruiserweight.
A champion that comes to mind was former WBA Featherweight Champion, Barry McGuigan, Ireland, after his stunning defeat at the hands of Stevie Cruz. Hugo Corro, Argentina, after losing his World Middleweight Title at the hands of Vito Antuofermo, on June 30 1979, in Monte Carlo, Monaco, by a split decision. Hilmer Kenty after losing his title to Sean O' Grady, he never asked for a rematch. Carlos Palomino never asked for a rematch after losing his WBC World Welterweight Title to Wilfred Benitez, on January 14 1979, in San Juan, Puerto Rico. Instead he chose to fight Roberto Duran, on June 22 1979 and lost by unanimous decision, in Madison Square Garden.
In retrospect, maybe Hilmer was burnt out. Over 300 amateur fights, and then after O'Grady, him and Stewart seperated. No shame in losing to Roberto Elizondo, but that was a fight he should have won under normal circumstances. And Corro probably wanted no parts of Hagler, bottomline.
Way better to quit "too early" than "too late." We as fans have no way of knowing what fighters are feeling mentally, physically, or otherwise. Only they know. We also have no way of knowing what their reasons for fighting was. If they have accomplished what they set out to do or have come to a realization that they will never achieve their goals, then they should quit. There really is no such thing as "quitting too early," especially in boxing.
Johnny Famechon. Retired at 26 after a narrow points loss to the great Vincent Saldivar. Watching the fight Fammo certainly wasn’t conquered. It was a bloody close run thing. But Fammo retired immediately afterwards, resisted any comebacks and left the game with every single faculty in place. A post boxing car accident aside his was a poster career for getting in and out before any damage was done.
The unfortunate side of course was Jimmy Carruthers, Benny Leonard and Ken Buchanan, who all retired as champs or top contenders. All three had to return to the ring wars after several years out of the game due to financial losses. Needless to say the comebacks were not a career success, however, I can't comment on whether or not it helped them recoup some of their losses as I don't know what kind of deals were struck for their comeback.
Marvin Hagler. Sure, he had lots of wars and made some good money, but he could have had a couple more fights.