PHOTOS: Mayweather trains ahead of mega-fight with Pacquiao

Floyd Mayweather Jnr began his official training camp at his Las Vegas gym on Monday as he prepares to take on Manny Pacquiao in May.

The undefeated world welterweight champion posted several pictures to the social media site on Monday night and also uploaded a video to Instagram after his first session - which took place on the same day Pacquiao started training at Freddie Roach's Wild Card gym in Los Angeles.

The pair will come face-to-face next week for the only time before the week of their $200million mega-fight. 

Credit: Martin Domin/SportsMail