#1 Conor McGregor

Yes! This might happen. And as soon as at WrestleMania 35. A couple of days ago, Conor McGregor announced his sudden retirement from the world of Mixed Martial Art or MMA.
Now to that, Finn Balor replied by saying "See you at 'mania brother". (You can watch the tweet below)
Now, what does that mean? Simple, Conor McGregor should show up at WrestleMania. But WWE superstars are known to play mind games with the fans, hence there's no confirmation of this tweet having any truth behind it.
Still, an impromptu appearance from the Notorious One would generate shock waves around the entire pro wrestling community. Just his presence in the crowd would keep everyone hyped and guessing what he'll do!
A confrontation with Vince McMahon or a backstage moment with "The Man" Becky Lynch or another ex-MMA player Ronda Rousey could turn out to be quite interesting.
Will he join WWE as Rousey did? Only time will tell. But the signs do point towards that.
Who do you think could show up at WrestleMania? Sound off in the comments section below!
Becky Lynch has been challenged HERE.