Mayweather and Pacquiao are widely recognised as the two best boxers in the world and are set to go head-to-head in one of the most hotly-anticipated fights in recent history.
The fight will take place at the MGM Grand Casino in Las Vegas in front of a crowd of around 16,500.
The fight is scheduled to take place at around 4am UK time on Sunday (3 May 2015) morning, with the fighters expected to enter the ring at around 5am.
Mayweather is the current favourite at around 1/2 with most bookmakers, while Pacquiao can be backed at around 2/1. However, new Paddy Power customers can get enhanced odds of 4/1 on Mayweather or 9/1 on Pacquiao.
The 38-year-old Mayweather is unbeaten in 47 professional fights since 1996 and has won world titles in five different weight classes. Pacquiao, 36, is a six-weight world champion but has been beaten five times in 64 fights since turning professional back in 1995.
WBO Featherweight Champion Vasyl Lomachenko is set to take on Gamalier Rodriguez, while Jose Cayetano will face Leo Santa Cruz for the WBC Super Bantamweight World Championship ahead of the main event.
Mayweather v Pacquiao is set to be one of the biggest fights in history financially. It is estimated that Mayweather will earn around £90m ($140-$150m) and Pacquiao £60m ($90m-$100m) from the bout. Mayweather has earned more than $400m from boxing over his 19-year career.
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BIOGRAPHY: Ethan Hazard
BIOGRAPHY: Daniel Sturridge