Photos:: Floyd Mayweather Jr. open training session

Undefeated welterweight champion Floyd Mayweather Jr. works out during media day at his camp in Las Vegas.

Floyd Mayweather Jr. looks on during a workout on media day at his camp in Las Vegas.

Floyd Mayweather Jr. runs drills for the media during an open workout in Las Vegas.

Floyd Mayweather Jr. works the speed bag during media day at his camp in Las Vegas.

Floyd Mayweather Jr. smiles during a workout for the media on April 14 in Las Vegas.

Floyd Mayweather Jr. works out during media day at his gym in Las Vegas.

Floyd Mayweather Jr. works out in front of the media on April 14 in Las Vegas.

Floyd Mayweather Jr. sits during an open workout April 14 at his gym in Las Vegas.

Actor David Hasselhoff attends Floyd Mayweather Jr.’s open media day workout on April 14 in Las Vegas.

Rapper Lil’ Kim takes a selfie during boxing media day at Floyd Mayweather Jr.’s gym in Las Vegas.

More than 40 pairs of boxing gloves are spread out for Floyd Mayweather Jr. before a media day work out on April 14 in Las Vegas.