The broadcast starts August 26 at 9pm ET/6pm PT with the undercard fights (the pairs are listed in the order of the boxers' exit to the ring):
Yordenis Ugas (19-3, 9 KOs) - Thomas Dulorme (24-2, 16 KOs)
10 rounds in welterweight (up to 66.7 kg)
Andrew Tabithi (14-0, 12 KOs) - Steve Cunningham (29-8-1, 13 KOs)
10 rounds in the first heavyweight (up to 90.5 kg) for the titles NABF and USBA
Nate Cleverly (30-3, 16 KOs) - Badoo Jack (21-1-2, 12 KOs)
12 rounds of light heavyweight (up to 79 kg) for the WBA title
Gervont Davies (18-0, 17 KOs) - Francisco Fonseca (19-0-1, 13 KOs)
12 rounds in the second featherweight (up to 59 kg) for the title of IBF (title at stake only for Fonseca, due to Davis's advantage)
Thus, directly the main battle Mayweather - McGregor will begin around 12pm ET/9pm PT.
Watch the broadcast HERE, HERE or HERE.