Mayweather v McGregor: How to see the fight
The bout is being staged in the T-Mobile Arena on the Las Vegas Strip.
With the UK eight hours ahead of Nevada, the fight is scheduled for mid-evening local time - at least 4am or even later in Britain.
Sky Sports Box Office has won the rights to show the contest in the UK.
The cost to domestic Sky viewers will be £19.95 up until midnight on Friday August 25.
After that the price will still be £19.95 if bookings are made via remote control or online. But it will be £24.95 if booked over the phone, with an additional £2 booking fee.
Cable customers are advised to contact their supplier for booking information.