#4 Brock Lesnar or Braun Strowman

John Cena has won 16 World Championships, and he tops the list along with Ric Flair for winning the maximum number of world titles. However, John Cena has never won the Universal Championship. Therefore, this blot on his otherwise exemplary career could be removed if he is booked in a match against the Universal Champion.
Currently, Brock Lesnar is the Universal Champion in WWE. Braun Strowman is scheduled to face him at the Royal Rumble for the title. The winner of that match could be made to compete against John Cena for the championship. Cena has faced both Lesnar and Strowman. A match between Cena and any two of these giants would be a treat to watch.
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It would help Cena win his 17th World title, and etch his name in history as the wrestler with the maximum number of world championship titles.