#1 Georges St-Pierre
This is a fight that has G.O.A.T status written all over it. Recent reports have come out claiming that GSP has targeted Khabib as his comeback fight and that the lightweight champion is perfect motivation for him.
He wants to be the man to inflict a first career loss on the Russian. Like Woodley, GSP would be the bigger man in this match-up, he's the former middleweight champion so it would be interesting to see if 'The Eagle' can do what he does against lightweights, to a man of this size.
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It will also test Khabib's grappling skills against one of the best grapplers the UFC has ever seen. As already mentioned, it would be very hard to argue that the winner of this fight isn't the greatest of all time.
Victory for GSP would see him make history and become the first ever 3-weight world champion, providing that the contest takes place at lightweight of course.