#2. Roman Reigns put down John Cena - WWE No Mercy 2017

Roman Reigns and John Cena look set to wrestle each other again at SummerSlam with Cena hyping a WWE return and The Head of the Table looking for an opponent worthy of challenging him for the Universal Title.
However, if Cena does come back from promoting Fast and Furious 9 to challenge Roman Reigns he may find himself negatively influencing that fantastic win rate. Because if history has taught us anything, it's that The Big Dog has The Champ's number.
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Reigns and John Cena first came at odds when John Cena traveled to Monday Night RAW to call out Roman Reigns. The two then had a series of heated confrontations that led to a match between the two at No Mercy 2017, which Reigns won.
That victory was also before Roman Reigns became the dominant force that he is now on SmackDown. If Cena can't beat Roman Reigns of a few years ago, what chance does he have against The Tribal Chief now?