#3 AJ Styles
Remember the 2016 Royal Rumble where this man made his debut at #3 and blew the roof off?
The Phenomenal One' was the most talked about superstar in the Royal Rumble which ended up being beneficial for him considering that Vince was not very high on AJ as a main event superstar.
His versatility in the ring speaks for itself, this has earned him a top spot on the blue brand and it wouldn't be a surprise if this man walks out of Arizona as the Royal Rumble winner.
From a creative stand-point, this victory makes sense, to start a blockbuster feud with Finn Balor at WrestleMania 35 for the WWE Championship.
A heel Balor as WWE Champion could ignite a brilliant feud with the baby face 'Phenomenal One' with Bullet Club being promoted in the background.
While these two superstars will tear the house down any place they go, there is another superstar who could debut in 2019 and shock the world.