1. Seth Rollins and Dean Ambrose

Underwhelming is the perfect way to describe Seth Rollins and Dean Ambrose's feud that happened at the end of last year. Their only PPV match at TLC was met with boos and "boring" chants from the crowd. WWE quickly shelved the feud and even got the title off of Ambrose a couple of weeks ago and put it on Bobby Lashley. Seth Rollins is also the favorite to win this year's Royal Rumble and go on to face Brock Lesnar and beat him at Wrestlemania. So Rollins will probably need a huge Rumble performance.
So starting the match off with his archnemesis will be the perfect way to go. Rollins and Ambrose can both run the gauntlet and be the ironmen for the match. Rollins, particularly, can pull off an enduring performance where he goes coast-to-coast and wins the match. Moreover, this will be a very exciting way to begin the Rumble match as, regardless of what happened, Rollins and Ambrose are capable of pulling off great matches and feuds against one another. Them starting the Rumble will hype up the crowd for whatever's to follow.
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Rollins' coast to coast stint will be perfect to set him up for his Mania match against Lesnar and it will also improve his stock as the new face of WWE.
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