#1 The Undertaker will finally retire

The Undertaker is a legend, the greatest WWE superstar of all time. His longevity and commitment have turned him into a household name even beyond the world of professional wrestling. However, the last few years have not been kind to the Deadman.
The respected veteran seemed to put a full stop to his legendary career after his main event match with Roman Reigns at WrestleMania 33, with what looked to be a symbolic and emotional goodbye. It was perfect. But he did return, squashing John Cena at this year's WrestleMania. Since then, 'Taker wrestled at WWE's three international stadium shows.
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His casket match with Rusev at Greatest Royal Rumble was an average outing while the "Last Time Ever" match against Triple H was an overbooked mess. That match signified just how much is left in the Deadman's tank. It isn't much. The following tag team match alongside Kane against DX at Crown Jewel was even uglier. Hopefully The Undertaker realises that he cannot keep on doing this he should ideally wrestle his final match at the same place he wrestled his last good WrestleMania match.
The variety of choices to retire the Deadman include Cena, Shawn Michaels or maybe Kane, in a Double Retirement Match. Whatever happens, WrestleMania 35 would be the perfect time to end The Undertaker's immortal career.