The following are of such cases:
Andre Anderson was a boxer who had far more talent than what he was ever given for. His career could have been something more than what the record shows, had it not been for mobsters and cheap promoters and selfish managers. His overall record stands at 14-19-4 with 12 KO's. He took dives against some of the best HW's of his time and to even unknowns. When he was told to take a dive against former professional football player and professional wrestler "Big" Wayne Munn, Anderson flat out refused saying:
"I'm through throwing fights and laying down whenever they want me to, I'm going to knock out Munn in one punch, if I can."
Which he did by KO in the 1st. Anderson was murdered no more than four months later, because of double-crossing the mobsters who told him to take a dive against Munn.
Jake LaMotta The Bronx Bull was shut out for years at getting a title shot for the Middleweight crown. LaMotta had faced all the leading contenders and bested them all. The mob had other ideas, since LaMotta did not want to be associated with them. They told LaMotta the only way he would get a title shot in NY was if he took a dive against Billy Fox, a seemingly up and coming LHW who was connected with the mob. LaMotta took the dive, only to admit before court that he did indeed fake the fight.
LaMotta did get his shot and the rest is history.
Billy "Blackjack" Fox is arguably the most manufactured fighter in the history of the ring. A man whose abilities as a boxer were average at best and a chin that gave off a musical tinkle when tapped. He went "undefeated" at 36-0 (36) and managed to get a shot at Gus Lesnevich and was undoubtedly "carried" until the 10th round. Fox then "won" seven fights, one of which was against LaMotta, all by "ko". He again got a shot at Lesnevich, but undoubtedly the champion was having no part of "carrying" Fox again and blasted Fox away in a single round.
After the second Lesnevich fight and word got out that Fox's fights were fixed, he was pretty much on his own and went a sorry ass 5-7-1 (4) though even the ones he won could have been fixes as well.
Primo Carnera was possibly the only HW champion to have won the title on a dive, though this has never been confirmed. It is known, however, that when Carnera first started off as a fighter his first twelve fights were fixed by his manager who thought that the gargantuan circus strong man would be a huge draw in the fight game. Carnera would later have legit fights but was most noted for his "tank town" tours against mediocre opposition who was usually much shorter than him to exaggerate his height.
Mitch Rose is one of several men who have stepped forward to claim that he was offered to take a dive against Eric "Butterbean" Esch, only to refuse and blew away the Bean in a single round. Rose' career of course, is one of mediocrity as is Esch'.
Randall Tex Cobb has been accosed of taking a few dives in his time as well, even accoused of paying off fighters to lose to him. The first instance of such was his surprise 1st round KO loss to Dee Collier and in his comeback he "won" fights against Sonny Barch and nine others, and was offered a shot at WBO champion Tommy Morrison, only to be accoused of paying off opponents and the fight never happened.
Other men such as Donnie Penelton and Frankie Hines and others have also had questionable fights and careers.
Who do you know of who has been in fixes, dives and second hand trickery?
