Floyd Mayweather Jr. in training

Barber Jackie Starr cuts the hair of boxing champion Floyd Mayweather Jr. in his locker room before a training session in Las Vegas.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr., who is unbeaten in 44 pro fights, has a look of confidence as he prepares for a training session.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr., who has won titles in five weight divisions, lifts weights during a training session for his upcoming fight against Saul “Canelo” Alvarez.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr., considered by many to be the best pound-for-pound fighter in the world, boxes with weights in front of a mirror during a training session in Las Vegas.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr. works out on the speed bag during a training session. His quickness and counter-punching ability are two of his biggest assets in the ring.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr. talks to his father, Floyd Mayweather Sr., during a training session. Mayweather was taught to box by his father, but his uncle, Roger Mayweather, has been his primary trainer for many years and his biggest bouts.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather’s boxing gloves are neatly lined up ringside at his gym in Las Vegas.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr. hits the heavy bag as he trains in his Las Vegas gym for his upcoming championship fight against Saul “Canelo” Alvarez.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr. works with the mitts as he progresses through his training session at his gym in Las Vegas.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr., who is known as “Money” Mayweather, is framed by the shoes of young fans watching his workout. TMT on the shoes stands for The Money Team.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr. works on his defense during a light sparring session at his gym in Las Vegas.  (Genaro Molina / Los Angeles Times)

Fan Famous Johnson, 5, watches as Floyd Mayweather Jr. works in the ring during a training session in Las Vegas.  (Genaro Molina / Los Angeles Times)

Floyd Mayweather Jr. watches himself in a mirror as he jumps rope during a training session at his gym in Las Vegas. Mayweather will fight Saul “Canelo” Alvarez on Sept. 14 at the MGM Grand Garden Arena in Las Vegas for the junior middleweight title.  (Genaro Molina / Los Angeles Times)