#4 Rey Mysterio

Rey Mysterio is known as the biggest "little" man in WWE. Mysterio has won the Royal Rumble event once before in 2006, where he lasted for almost an hour en route to a historic victory.
Mysterio is known to be a performer who gives his all during matches, and it could very well be the case come Rumble. Rey Mysterio made a surprise return to WWE at last year's Royal Rumble event and could once again light up the Rumble in 2019.
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The SmackDown Superstar is highly unlikely to win the Rumble and get a shot at either the Universal title or the WWE Championship anytime soon. However, Mysterio is definitely capable of being the iron man at the Rumble by lasting for a long time. He has done it before and can do it once again!
Rey Mysterio giving a solid performance will help WWE entice the viewers from the Attitude Era and Ruthless Aggression Era.