#1 AJ Styles
AJ Styles is easily the biggest star on this list. After spending the majority of his career with TNA, it looked as though we would never see the Phenomenal One in the WWE. This all changed when Styles snubbed a return to Impact Wrestling and instead finally debuted for Vince McMahon's company in 2016.
The 41-year-old currently holds the WWE Championship, a reign that has lasted for over 350 days. He is currently SmackDowns biggest star and luckily for WWE fans, Styles looks as though he will re-sign with the company in 2019. The wrestler has dismissed rumours that he will soon retire, and it is unlikely that any company could match what the WWE is currently giving him, both creatively and financially. Expect to witness the Phenomenal One at the top of the WWE for a number of years to come.