The titles at stake are Mayweather’s World Boxing Association and World Boxing Council Welterweight world titles, as well as Pacquiao’s World Boxing Organization welterweight title.
Bayless will be backed up by the American judges Burt Clements, Dave Moretti and Glenn Feldman.
The WBA appointed Gilberto Jesus Mendoza as the supervisor of the fight.
Floyd Mayweather v Manny Pacquiao for the undisputed welterweight and pound for pound championship is live on Showtime and HBO PPV priced at $99.95 in the US, whilst Sky Sports Box Office will broadcast the event in the UK for £19.95.
