#3 Brock Lesnar
Ladies and gentlemen, I present to you your reigning, defending, undisputed WWE Champion and the No.1 entrant into the Royal Rumble, Brock Lesnar.
This Rumble will be centered and booked around the current WWE Champion. While I have zero doubt that Lesnar will continue working and stay in WWE, I do have a concern that this may be his last Rumble match.
First off, Lesnar is an attraction in himself and doesn't need the Rumble match to give him a reason to work WrestleMania. He could also stay around and just work the Saudi Arabia events for the major payday he receives.
Also so often, he is the champion or competing for the title and history says the titleholder doesn't often compete in the thirty-man match.
This could certainly be the Beast Incarnate's last Royal Rumble match and with him entering at No.1, I have a feeling it will be one you won't forget that easily.