2. Drew McIntyre and Braun Strowman

Drew McIntyre has been on the cusp of a huge push for a while now. Although he has been pinned a few times on Raw during this time, he has retained his credibility and popularity. The people seem to be behind him and he seems to be over with the WWE Universe. But ever since McIntyre's push started he has teased a match against Braun Strowman. McIntyre has laid out Strowman on several occasions but has never had an official match with him. A WrestleMania match has been rumored and the Rumble will be the perfect place to start building towards it.
Strowman was recently removed from his match against Brock Lesnar. There are two theories behind this. Either he was simply removed because WWE felt Balor was the right choice for Lesnar's opponent or the more popular rumor is that Braun is still injured. However, he did compete on Raw this week and will probably appear in the Royal Rumble match. It is unlikely that he will win but whoever eliminates him will get a huge rub going forward. McIntyre and Strowman starting the rumble and absolutely dominating the early entrants will be the perfect way to kick off a hard-hitting Rumble match.
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If some time into the Rumble, maybe at the very end, McIntyre eliminates Strowman or vice-versa, it will set up their match at WrestleMania perfectly.
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