Very few fights are fixed. Las Vegas sportsbooks don't know a damn thing and have zero influence. Anyone who proclaims otherwise is a certified wacko. I worked in the sportsbooks as supervisor. We were life and death to have the employees show up on time, and for the odds in the computer to match the odds on the betting board. There were countless mistakes that we caught barely in time that the bettors were never aware of.
Films like Oceans 11 are comedic. The casinos want you to believe they are all knowing and all seeing. The truth of the matter could not be more opposite. The undercover security guys used to tell me all the time that the camera crew sent them on wild goose chases.
It's all about fear. Prevent criminals by scaring them before they make the attempt. If they knew the truth the fright wouldn't be there.
Boxing does have more vulnerability to being fixed due to low number of influencing variables...two fighters, one referee and three judges. Football, in contrast is virtually impossible to manipulate given 22 people on the field at all times. Anyone who proposes a football outcome was manipulated truly deserves a spot in the looney bin. Basketball with only 5 guys on the floor for each team is less susceptible than boxing but still doable, which is why there have been some high profile examples.
During my years in Las Vegas I saw first hand the Tulane scandal in 1985 and Arizona State in 1994. In 1985 I had been in town only one year. A very well dressed guy sat down next to me at Caesar's Palace with a briefcase on his lap. We had never seen him before. He looked completely out of place. All he cared about was the Memphis/Tulane game. I bet Memphis in that game, giving -5.5 on the road. Keep in mind there were very few scores provided in those years. The large sports ticker in each sportsbook gave only one score at the midway point of the first half, then the halftime score, then midway second half, and then final. So if the game wasn't televised you had very little idea about changing momentum.
This guy said he needed Memphis also. When they were down midway through the first half he was shaking and mumbling to himself. Then when the halftime score came in he cursed and bolted out of his seat. Memphis was still trailing.
They went on to cover the spread. But when news broke much later about the Tulane fix I was certain that game had to be on the list. It was. And I'm sure that guy had been sent to town to wager large sums on Memphis to cover.
That was unbelievably sophisticated compared to the Arizona State morons in 1994. They were so brazen and stupid they literally didn't try to conceal anything. I'll never forget the Friday night before Arizona State hosted Oregon as 12 point favorites. The Saturday numbers went up on Friday afternoon in that era and many books stayed open all night or at least until midnight to accommodate the early action. I was walking the Strip late at night and suddenly that Arizona State number was bizarre everywhere. It was changing seemingly by the minute, and never the same at any joint. I was walking south to north and it was like 12 at Little Caesar's, then 11 at Bally's, 10 at Barbary Coast, 9 at Flamingo Hilton and Imperial Palace, then 8 at Harrah's. I have never seen anything like that, before or since.
Finally I asked my friend Doug at Harrah's what was going on. He was a huge Browns and Buckeyes fan who sadly passed away a few years later. Doug told me that 4 or 5 young guys wearing Arizona State gear were drunk and wagering on Oregon for the limit time after time. They were laughing and really didn't care what he moved the number to. They just wanted Oregon again.
Once that scandal surfaced within weeks, that game was on the list. No kidding. I think Arizona State won by 7 or 8, just under the number.