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Floyd Mayweather says he attempted to place a $400k bet on himself, but the casino wouldn't allow him to place the wager. (0:34) 
  
 Not everything went right for undefeated boxing champion Floyd Mayweather on Saturday night. 
  
 Multiple sources told ESPN that Mayweather went into the sportsbook at the M Resort in Las Vegas at around 3:30 p.m. PT Saturday with cash and plans to bet on his fight against UFC star Conor McGregor. 
  
 Mayweather attempted to place a $400,000 bet on the fight ending under 9.5 rounds at -200 odds, but according to a source, there were concerns over the legality of a fighter betting on anything other than a straight win, which caused a delay. 
  
 Mayweather then tried to bet on himself to win by knockout, but was unhappy about having to wait to place the wager and left without getting the bet down, the sources said. 
  
 "He was pissed," one source said. 
  
 The sources weren't sure whether he placed the bet at another sportsbook. 
  
 Mayweather, who went off as a -500 favorite at most sportsbooks, stopped McGregor 1 minute, 5 seconds into the 10th round. Mayweather would have won either attempted bet: under 9.5 or to win by knockout. 
  
 "I think that we bet 100 on 9½," Mayweather told ESPN's Sal Paolantonio after the fight. "I gave my guy six figures to go bet. I have to make sure he bet because earlier today I went to the sports book to bet and they wouldn't let me bet." 
  
 Mayweather later told SportsCenter he gave a friend $400,000 to bet, but that the friend was only allowed to place a bet for $87,000. 
  
 Neither the Nevada State Athletic Commission nor Nevada Gaming Control has regulations addressing a fighter's ability to bet on himself. 
  
 CG Technology, which operates the sportsbook at the M Resort, said it would not comment on an individual customer. ||||| CLOSE Conor McGregor and Floyd Mayweather look back on their 10-round battle. USA TODAY Sports 
  
 Conor McGregor reacts following his loss in the tenth round by TKO to Floyd Mayweather Jr. at T-Mobile Arena. (Photo: Mark J. Rebilas, USA TODAY Sports) 
  
 LAS VEGAS — Conor McGregor is expected to collect about $100 million for his fight against Floyd Mayweather, but he didn’t seem to know exactly how he’d spend it after suffering a 10th-round technical knockout Saturday night. 
  
 McGregor’s personal clothier told USA TODAY Sports that the Irish mixed martial arts star forks out more than $1 million a year for clothes. McGregor has an affinity for luxury cars, too. But even with a fleet of new vehicles and and a walk-in closet full of new suits, McGregor, 29, presumably would have tens of millions of dollars at his disposal. 
  
 “I don’t know how I spend it,’’ he said during a post-fight press conference. “I just carry on living my life. Carefree, with a smart mind and just enjoy life.’’ 
  
 More: Money Fight tells more about sports fans than it does fighters 
  
 McGregor: Judges were 'biased' in fight against Floyd Mayweather 
  
 Mayweather: Retiring "for sure" after beating Conor McGregor 
  
 That said, McGregor indicated he intends to make sure he gets what he’s owed. While McGregor was guaranteed $30 million for the fight, that figure could more than triple thanks to revenue from pay-per-view sales, merchandise sales and sponsorship. 
  
 “Well, now we go into the accounting phase,’’ he said, adding, “I send auditors in there like (expletive) sharks.’’ 
  
 With that left to his auditors, McGregor seemed more focused on making money than spending it. 
  
 He brought a bottle of what he called Notorious Irish Whiskey to the press conference and indicated he’ll be selling his branded liquor soon. Earlier in the week, he also announced he’ll be launching a fashion line with his personal clothier, David August Heil, and that he was about to quadruple his net worth with his payday from his bout against Mayweather dubbed as “The Money Fight.’’ 
  
 “There are so many ventures that are bringing in nice revenue for me,’’ he said. “I’m building brands. 
  
 “The money’s good for me. I’m very blessed and very happy I’m in the position I’m in. Right now I’m in the stage of forever money. As long as I’m tactical and make some smart decisions and don’t do nothing stupid, I’m set for life.’’ 
  
 Gallery: Best of the Money Fight |||||
Output:
Floyd Mayweather Jr. bet his reputation and his unblemished record on Saturday's bout with Conor McGregor—and he tried to bet plenty of cash as well. Sources say he tried to bet $400,000 on himself ahead of the fight, but ended up leaving the sportsbook at the M Resort in Las Vegas in frustration. Mayweather tried to place bets on himself to win in under 9.5 rounds and to win by a knockout, the sources say. Nevada does not prohibit boxers betting on themselves, but insiders say there were worries about whether it was legal to place a bet on something more complicated than a straight win. Mayweather gave up because placing the bets was taking too long. He would have won both, adding to an estimated $200 million haul. "I gave my guy six figures to go bet," Mayweather told ESPN after the fight. "I have to make sure he bet because earlier today I went to the sportsbook to bet and they wouldn't let me bet." He later said he gave the friend $400,000, but he was only allowed to bet $87,000. The defeated McGregor, meanwhile, is expected to make at least $90 million from the bout, including merchandise sales and sponsorship, USA Today reports. The Irishman brought a bottle of "Notorious Irish Whiskey" to a post-fight press conference and said he plans to launch his own line of liquor soon.