#9 Randy Orton

Randy Orton is one of the greatest WWE superstars of all-time, and the Viper had won the Royal Rumble match in 2017 after eliminating Roman Reigns. Orton also won the WWE Championship that year at WrestleMania, but the chances of the same thing repeating in 2019 are very slim.
However, the WWE would want to have the future Hall of Famer in the Royal Rumble match, as he is not competing in any other match on the card.
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Also, his rivals Jeff Hardy and Rey Mysterio are in the match, so it makes storyline sense to have Orton feature in the Rumble match. The 13-time WWE Champion may well try to outlast 29 other men to battle for the WWE Championship at WrestleMania 35 by entering the Royal Rumble match.