#3. John Cena and The Undertaker

This match and feud may have little to no long-term implications. However, over the course of the last twenty years, a confrontation between these two men is likely based on a number of different factors.
Many will recall that last year's Wrestlemania was not the most impressive showing for the Undertaker, and in saying that, he would want to redeem himself since it appeared his showing was marred by injury, causing him to slow down and not perform like fans know he is capable of.
For Cena, he is as committed to his ventures outside WWE as he has ever been, but that doesn't mean he doesn't love to perform in front of an audience. Much like his feuds with the Miz and Roman Reigns, and his ability to elevate both men through promos, this feud appears to be the best option for both men, with whoever wins or loses really having nothing held against them in the eyes of the fans.
Both men are certain to be a part of the WWE's Hall of Fame and have wrestled nearly their entire career for the promotion.
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