#1 Seth Rollins
This year, the Royal Rumble PPV will take place at Chase Field in Phoenix, Arizona and with 40,000 fans in attendance, the fans would love to push the Kingslayer as the next face of the company in front of such a huge crowd. Seth Rollins is the favourite to win the Royal Rumble match of 2019 and challenge Brock Lesnar for the Universal Championship at WrestleMania 35.
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Seth has lost some momentum of late, as he has lost several Intercontinental Championship matches in the last few weeks. So, the WWE Creative may keep him as the Ironman of the Royal Rumble match to solidify his character.
An Ironman Seth Rollins winning the Royal Rumble match after conquering 29 other superstars will surely tell a story to the WWE Universe and so, he is the best option with WWE as far as the Ironman of the 2019 Rumble is concerned.