According to the site’s Sportsbook Brand Manager Dave Mason (bio below / available for comment), the prop bet asks who McGregor will fight next and is available here: https://www.betonline.
Who will McGregor fight next? | American Odds | Fractional Odds |
Nate Diaz | +150 | 3/2 |
Tony Ferguson | +225 | 9/4 |
Khabib Nurmagomedov | +250 | 5/2 |
GSP | +2000 | 20/1 |
Floyd Mayweather | +5000 | 50/1 |
Anderson Silva | +1000 | 10/1 |
Dustin Poirier | +900 | 9/1 |
The number listed under American odds represents a bettor’s profit on a $100 bet. So, if McGregor fights Khabib next, the bettor would profit $250 on their $100 bet for picking the correct outcome.