Gene Tunney did. Of course he fought back in the 20s when taxes were low. He earned a lot for his second fight with Dempsey, fought once more against a second-tier heavy earning $990,000, and retired undefeated. One of his sons became a Senator.
He married a woman who came from money - maybe that helped.
The rest of the heavyweight champions is much of a muchness - mostly easy come, easy go. John L. Sullivan drank away everything he earned, although late in life he became a temperance advocate. Jim Corbett was never terribly rich, but he scraped by as a trainer and handler - he appeared in a couple of low-budget films and a vaudeville show or two. Bob Fitzsimmons never earned much, and he died of pneumonia in his 50s. Jim Jeffries did OK - he owned an alfalfa farm, and promoted some fights. His barn is now part of Knott’s Berry Farm - I’ve seen it. Jack Johnson spent everything as fast as he earned it. He died in a car crash, and the car was a gift for publicity.
Jess Willard was never enthusiastic about boxing - he started when he was 28. Dempsey smashed the hell out of him - as Willard left the ring after losing the title, jaw broken, cheekbone smashed, ribs cracked, he was said to mutter to himself over and over “I have $100,000 and a farm in Kansas. I have $100,000 and a farm in Kansas”. He tried a comback later, but Firpo knocked him out and he stayed on his farm for the rest of his life.
Max Baer spent it all. He would sell a piece of his future earnings when short of cash - at one point he sold 117% of his future. Jim Braddock, the Cinderella Man, lost whatever he earned in bad investments, and went back to blue-collar work for the rest of his life.
Dempsey lost a lot of his money in the Depression, but founded a successful restaurant. Tunney has been mentioned. Jack Sharkey did OK - he became a professional fly fisherman. Max Schmeling lost a lot in the war, but he owned the Coca-Cola franchise for West Germany and was actually moderately well-to-do, eventually. Louis lost it all, and wound up living in a casino on the charity of the owners, and still owed the IRS a million bucks. He was once asked if he regretted not fighting in the modern era. He replied “Nah - I would have wound up owing the IRS ten million instead of just one.”
Ezzard Charles never earned much - he was unpopular for not being Joe Louis, and had to keep fighting for years after he should have quit. He died of Lou Gehrig’s disease, and needed a fund raiser to pay his bills. Jersey Joe Walcott also never earned big money - he became a deputy sheriff after a while.
Rocky Marciano was never poor, but he lost most of his ring earnings in bad investments. He died in a plane crash before he ran out of what was left.
Floyd Patterson kept fighting for way too long. He wound up working in a sinecure for the New York State Athletic Commission, but had to quit when it became clear that he was too punch-drunk to remember his own secretary’s name.
Sonny Liston lost it all to heroin, and died of an overdose. Ali pissed it away on divorces, although he could always make a living being Ali. Frazier ran a gym. Foreman hit on his jovial fat guy image, and the Grill, and made an incredible comeback to win the title back in his late middle age. Spinks lost everything - I think he was homeless for a while, and last I heard was working as a school janitor.
Larry Holmes seems to be an exception. He has a lot of investments in Easton, including an office building, and seems to be more than OK financially.
It’s too soon to tell if any more modern champions will wind up with what they earned.
Regards,
Shodan