#7 Conor McGregor

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What can you say about the Notorious one? Although there is still time to see him defend one of his UFC belts, his history with championships already proves that he has no desire to do so.
McGregor has won two championships in the UFC, two for Cage Warriors and one other in a regional promotion in the UK.
He has defended none of these titles throughout his career and instead (as we are seeing now) is often more intrigued by bigger and more thrilling prospects such as (currently) booking a fight with Floyd Mayweather.
Unfortunately, being a UFC champion means a lot more scrutiny on your next move, a queue of contenders awaiting a shot at the title and a lot less places to hide when the title isn’t being defended.
It seems less and less likely that McGregor will defend his lightweight title as the idea of jumping weight classes, having a rubber match with Nate Diaz and landing his hand in boxing seem more compelling.