Floyd Mayweather is the top pound-for-pound fighter in the sport of boxing and his undefeated record speaks to the level of dominance he has been able to maintain over the course of his career. There are only a handful of fights in his 44-match career that one can point to the bout ever being even slightly in jeopardy for "Money."
Mayweather is stepping into the ring with a bigger, stronger and younger opponent on Satruday night though -- and, to boot, he's also undefeated in more than 40 fights.
Saul "Canelo" Alarez is the rare superstar in boxing who can do more than play B-side to Mayweather. That's why the fight is a massive attraction, unlike anything seen in recent years, but it's also why Mayweather isn't a dominant favorite in the Vegas odds.
Mayweather is currently sitting as a -260 to -280 favorite at most sportsbooks with Canelo as a +210 to +245 underdog.
For reference, here are Mayweather's odds in his last five fights, since coming out of his brief retirement:
vs. Guerrero -650
vs. Cotto -700
vs. Ortiz -600
vs. Mosley -400
vs. Marquez -425