Floyd Mayweather was celebrating another Saul 'Canelo' Alvarez defeat in Las Vegas on Saturday after Dmitry Bivol's victory earned him $42,500.

Russian Bivol retained his WBA light heavyweight title at the T-Mobile Arena, claiming the scalp of the Mexican superstar with a unanimous decision victory.

Super-middleweight king Canelo suffered only the second loss of his illustrious career stepping up in weight, with all three judges scoring the bout at 115-113 in favour of Bivol.

Mayweather consigned Canelo, rated as the best pound-for-pound boxer in the world, to the only other defeat of his professional career at the T-Mobile Arena nine years ago.

The retired American legend cashed in on the 31-year-old's second defeat, placing a $10,000 bet on Bivol to come out on top for a return of $52,500.

Mayweather posted a picture of his winning betting slip on Instagram and wrote: "Easy pick up."

Alvarez confirmed he would exercise his rematch clause.