This makes Showtime the top destination for the sports rising stars like Alvarez, Garcia and Adrien Broner.

FORBES: Showtime Kicks Off Floyd Mayweather Month With '30 Days In May'

The HBO announcement means the loss of other Golden Boy fighters like Adrien Broner, who some expect to replace Mayweather at the top of the sport, and 48-year-old Bernard Hopkins, who won the IBF light-heavyweight title this month from Tavoris Cloud on HBO.

FORBES: Floyd Mayweather Defection To Showtime Is Last Straw As HBO Drops Golden Boy