On Saturday, August 26 UFC lightweight champion Conor McGregor will take on boxing legend Floyd 'Money' Mayweather.
The fight is set to take place at the T-Mobile Arena in Las Vegas and millions of fans across the world are expected to be tune in.
Here is a guide on everything you need to know about how you can watch the fight.
What time does the fight start?
The event is expected to start after 4am BST, but the Floyd Mayweather vs Conor McGregor fight is likely to start around 5am - however this is likely to change and it could be as late as 5:30am GMT.
How can I watch it?
Fans can tune in to Sky Sports Box Office to watch the event live at a cost of £19.95.
You can also watch Mayweather vs McGregor through your NOW TV Box. To do this you just need to order online here and then download the app on your NOW TV Box. Again it will cost you £19.95.
If you are not a Sky customer and don't have NOW TV you can live stream the fight on your PC, desktop, Mac, iPhone or Android phone or tablet. All you need to do is set up an account with Sky, sign up and pay (£19.95) to watch it.
Once you've paid simply select which device you will be using to watch the fight. You will only be able to view on one platform at any one time. Create an account here .
Who is on the undercard?
Gervonta Davis, who is regarded as Mayweather's protégé, will take on Francisco Fonseca to defend his IBF junior lightweight title.
Elsewhere, British boxer Savannah Marshall, who has competed at the past two Olympics, will make her professional debut in the super-middleweight division against Sydney LeBlanc.