#4 Conor McGregor
Conor McGregor is the biggest name in the world of MMA and one of the most famous in the world today, owing to his exploits with the UFC. The first man to hold two UFC World Titles in different weight classes simultaneously has recently set his sights on a bigger pay day by calling out boxing Superstar Floyd Mayweather.
WrestleMania 33 provides the perfect platform for Conor to get even more eyes on him and further build his almost inevitable boxing bout against the undefeated Mayweather.
The WWE probably need McGregor more than he needs them but it will be a win-win situation if they are able to come to an agreement to bring the Irishman to the world of professional wrestling on The Grandest Stage of Them All.