#3 Seth Rollins

Year 2018 has been the year of Seth Rollins. Rollins brought back his curb stomp, he defeated Roman Reigns and John Cena on the same night in a gauntlet match, won the RAW tag team championship one more time, and went on to win the Intercontinental Championship two times, and in the process became a grand slam champion.
One thing which has escaped Seth Rollins this year has been the top prize - the Universal Championship. Brock Lesnar's reign as the champion, and Roman Reigns going after the title restricted Seth Rollins to the upper mid-card.
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Roman's exit was emotional for everyone including his best friend Seth Rollins. That night became even more emotional after Dean Ambrose assaulted him just after winning the RAW tag team championship. These incidents gave a lot of sympathy to the already over character of Rollins.
In the absence of Roman, this feud could be what Rollins desperately needs to become the biggest babyface in WWE.