Unbeaten boxer Floyd Mayweather tops Sports Illustrated's list of highest-paid pro sportsmen for the second straight year, according to the list released by the magazine on Wednesday.

Mayweather stretched his perfect record to 44-0 with a 12-round unanimous decision over Robert Guerrero on May 4, the first fight in his new megadeal with Showtime television that guarantees him at least $32 million per fight over six bouts.

The fight for Mayweather's World Boxing Council welterweight world title was the champion's first since serving a jail term for domestic violence last year.