#1 Triple H vs Braun Strowman
It is very certain that Lesnar would retain the title at the Rumble and Wrestlemania without Triple H is incomplete. He has appeared in every edition of it from Wrestlemania 24 onward.
If he enters this year's Royal Rumble is something to be seen as after Wrestlemania 33, he appeared only in Survivor Series but if he does, then Strowman should be sure the one to go against. They were the only two survivors in the main event and their altercation after the match was the only positive talking point of the show.
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They too could have a face-off with the crowd cheering Strowman. They would exchange moves before Braun eliminates Triple H. This would be enough to humiliate The Game and in the coming weeks will attack him continuously. He and Stephanie could put Braun in handicap matches with various other competitors over the weeks and finally lead to a No Disqualification match between them at Wrestlemania.
The King of Kings has done a marvellous job till now by pushing up the careers of other wrestlers in WWE like Seth Rollins, Roman Reigns and Daniel Bryan. The fans have no doubt that he can continue to do the job against the Monster among Men.
Do let us know in the comments section which other altercations you would like to see in the Royal Rumble.