Dana White is president of the UFC.
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As high-profile UFC fighters look to move into professional wrestling, the merger could leave WWE stars struggling for exposure.
Who will win?
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Millions of dollars will be made by both sides from the fight but does boxing have more to lose than UFC in this big money head-to-head?
Ronda Rousey ( R ) and Bethe Correa battle it out in 2015.
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Brutal beginnings to aggressive marketing – how UFC gave momentum to take MMA mainstream.
More than two decades after the World Medical Association called for a ban on boxing, knocking a person senseless is still condoned, even celebrated.
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The death of a 23-year-old boxer and the lifting of cage-fighting bans in every state but Western Australia raise the question of why we allow violence that would be criminal outside a ring or cage.