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Come Fan with UsFriday, June 26, 2026

Mayweather vs. McGregor odds: Bettors looking for an upset at super fight this summer

The super fight between Conor McGregor and Floyd Mayweather is happening in August, and the sportsbooks have already rolled out betting lines and props for the event.

Frank Warren and Floyd Mayweather JR Press Conference
Frank Warren and Floyd Mayweather JR Press Conference
Photo by Dan Mullan/Getty Images

Floyd Mayweather has compiled a perfect 49-0 record over the course of his storied boxing career. The greatest boxer of this era will try to improve to 50-0 this August against MMA superstar Conor McGregor.

Mayweather is going off at -550 to win this fight in Las Vegas at sportsbooks monitored by OddsShark.com. The betting action on this fight has been fascinating. Despite the fact that the vast majority of experts seem to consider Mayweather to be a massive favorite in this fight, the betting public has overwhelmingly supported McGregor since this super fight became official.

After opening as a +950 underdog (against Mayweather going off at -2250), Conor McGregor’s odds to win the fight have been pounded all the way down to +375. This movement makes sense from a casual fan’s perspective, as a recreational boxing bettor is much more likely to be drawn into a potential big payday on one knockout punch than they are to a huge chalk favorite that will pay out very little with a win.

However, it’s difficult to gauge how much of this action on McGregor is from fans who are giving him a legitimate shot to win, or how many are simply rooting for him to win and taking a shot.

Veteran boxing bettors will probably look to bet this fight via props instead of simply on the moneyline. The obvious prop bet that jumps out is Conor McGregor by KO, TKO or DQ going off at +550.

Even the most optimistic McGregor backers should appreciate that the MMA fighter’s odds of out-boxing one of the all-time greats and winning this fight by decision (+3300) are virtually zero; so a bet for McGregor is a bet for the knockout. McGregor bettors might as well take the extra equity on the knockout wager on the Mayweather vs. McGregor odds.

Floyd Mayweather’s path to victory is trickier to predict. Mayweather by KO, TKO or DQ is a slight favorite at -125 over Mayweather by Decision at +130. The welterweight hasn’t won a fight by knockout since 2011, winning his last seven fights by decision.

But against a fighter who isn’t conditioned for 12-round bouts, this might be Mayweather’s best shot at a KO win in years.

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