Amanda Nunes bids to hold on to one of her two UFC titles tonight when she defends her featherweight belt against Felicia Spencer.
The dual champion returns to the octagon for the first time since her hard-fought points win over Germaine de Randamie in December against her much less experienced Canadian opponent.
Spencer has only eight professional mixed martial arts bouts to her name and has won seven, losing only to Cris Cyborg.
In the UK, the fights can be streamed on the BT Sport app and website for subscribed customers.
Fans who have not subscribed - and who are EE phone customers - can sign up for free, by clicking here.
The fights will be shown live on BT Sport from 1am with the main card starting at 3am - but those without a subscription have been advised not to stream the fights online.
Kieron Sharp, CEO of the UK's leading intellectual property protection organisation FACT, has said: "Whether it’s watching a live stream on social media, using a piracy site, or a box or stick connected to your TV, watching it any way other than through the official provider is illegal.
"People need to be aware that this is no longer a grey area, in fact it is very black and white. If you are accessing content for free such as sport, TV and films for which you'd normally need a subscription, this is illegal
"FACT is leading the way in combating digital piracy and working with PIPCU and industry bodies to crackdown on illegal streaming and to hold those behind them accountable for their actions.
"It is getting harder to watch live sport illegally and fans should be aware that if they are planning to watch the fight this way they are breaking the law."