#1. The Undertaker
For the first time in 19 years, The Undertaker doesn't have a match at WrestleMania. Let that sink in. He's gone up to 24-2, and wrestled on PPV/Specials on four different occasions in 2018, further proving that he's far past his prime and needed to retire.
Unfortunately, him being past his physical prime was clear years ago, with many fans suggesting that he should have retired at WrestleMania 30. Ultimately, it can be frustrating because nobody knows what his endgame is.
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He was supposed to retire at WrestleMania 33, only to come back and have a 165-second match against John Cena the next year. However, from the look of things, The Undertaker seems to have finally realized that he was taking too many dates, and has openly stated it as well.
He's even stated that he doesn't want to overstay his welcome, and while he is the greatest legend in WWE history, his time is simply over. He's likely already retired..