Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Has there ever been more at stake in any mixed martial arts fight? Jose Aldo is the only featherweight champion in UFC history, is undefeated in 10 years, and is ranked as the No 1 pound-for-pound fighter in the world. He couldn't have more to lose. At the same time, Conor McGregor has talked so much and made so many promises that a loss could seriously derail the Irishman's surging hype train and even cut the supply of his huge cash flow. This is the biggest fight in UFC featherweight history and of both of these fighters' careers. They also have the hopes of a nation on their backs, particularly McGregor who will once again bring thousands of travelling Irish with him to Las Vegas.Jose Aldo fights Conor McGregor at the MGM Grand on Saturday nightIt is biggest fight in UFC featherweight history and in both fighters' careersThe fight will be live on BT Sport 2 in the UK at around 3am GMT 
 Question:Both men are undefeated in the UFC with Aldo set to make his eighth title defence and McGregor looking for his sixth knock-out in his seventh _ bout.

UFC