5) Floyd Mayweather vs CM Punk
No doubt the biggest fight on this list, one that would give Mcgregor a run for his money and could very well beat every Pay Per View record ever for the UFC.
CM Punk so far has had two fights in MMA and has been overpowered due to his lack of ring IQ and very basic ground and striking game. Mayweather is the greatest boxer in the modern era but has no to little knowledge about MMA.
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The two possess minimal Mixed Martial Arts intellect, but are well-known superstars around the world, and thus the UFC match-makers can put together this bout which is low on skill but very high on star power. The stumbling block could be Money's exorbitant asking price but all parties involved are veterans and have put together some of the biggest fights in all of sport, so fingers crossed they can get this done.