Didn't list all the possible participants. Just the most likely winners.
Men's Royal Rumble
Shinsuke Nakamura wins Royal Rumble -150
Roman Reigns wins Royal Rumble +220
Daniel Bryan wins Royal Rumble +1100
Dolph Ziggler wins Royal Rumble +1000
John Cena wins Royal Rumble +1500
Braun Strowman wins Royal Rumble +1750
Finn Balor wins Royal Rumble +1750
Women's Royal Rumble
Azuka wins Royal Rumble -105
Ronda Rousey wins Royal Rumble +125
Becky Lynch wins Royal Rumble +1100
Nia Jax wins Royal Rumble +1600
Sasha Banks wins Royal Rumble +2250
Stephanie McMahon wins Royal Rumble +750
Brock Lesnar vs Braun Strowman vs Kane - Triple Threat Match - WWE Universal Championship
Brock Lesnar wins Triple Threat Match -1500
Braun Strowman wins Triple Threat Match +950
Kane wins Triple Threat Match +2500
AJ Styles vs Kevin Owens & Sami Zayn - Handicap Match - WWE Championship
AJ Styles -600
Kevin Owens & Sami Zayn +400
Seth Rollins & Jason Jordan vs Cesaro & Sheamus - Tag Team Match - WWE Raw Tag Team Championship
Seth Rollins & J.Jordan (initial ruling) +175
Cesaro & Sheamus (initial ruling) -245
The Usos +180
Chad Gable & S.Benjamin -260
Per 5Dimes