Though money line betting is a straightforward way to go about wagering on boxing, you may want to explore other betting avenues. An interesting bet to make. People are putting their money on Conor McGregor to beat Floyd Mayweather. year, online gambling site Bovada made McGregor a 10/1 underdog. MMA star who is making his pro debut against the best boxer of his era. BOXING Odds - Live BOXING Betting Lines. September 23, - Compare and find the best BOXING spreads and lines anywhere on the internet!.