#1 The Men's Royal Rumble match

When It's pretty much confirmed who will be the one to face Brock Lesnar for the Universal Championship at Wrestlemania, the question is what will the person move on to the big match by winning this year's Royal Rumble?
It was the WWE's long-term plan to have Roman Reigns face Brock Lesnar for the Universal Championship at the show of shows. But it is highly unlikely that he will get to the match by winning this year's Royal Rumble match. The best way possible to have him go on to face Lesnar is by having him win the elimination chamber match and become the No. 1 contender for the title.
This leads us to Big match John, Cena is now at par with Ric Flair for the highest reigns as the WWE Champion and it is possible that the WWE would be looking to have Cena break that record and give his 17th WWE Championship. This could be achieved by having him win this year's Royal Rumble match. However, that's not going to be the case as it is being reported that the seeds for the match between John Cena and the Undertaker will be planted at the 25th-anniversary show of Monday Night Raw.
If Reigns or Cena won't be the ones to win this year's Royal Rumble match, it could very well be a Smackdown superstar who will win the 30 men bout this year. The blue brand's roster only has a handful of superstars who could win the rumble and there are two names in the equation as of this writing to win the 30 men bout.