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That's significantly less than the record $41.5 million Mayweather will be paid.
The fight - which Showtime is calling "The One" - is the biggest
It's not uncommon for a challenger to earn less than a champion, especially when it comes to Floyd.
While Canelo is a massive celebrity in Mexico, this is his first introduction to a mainstream American audience. The 23-year-old red head from outside Guadalajara has won 42 of his 43 career fights, with one draw and zero losses.
Mayweather is also undefeated, and doesn't seem to be particularly threatened by Canelo.
This is the second fight of a six-fight deal (worth a rumored $300 million) that Mayweather has with Showtime.