#1 The Undertaker
Let's get this out of the way first, there isn't much of a chance that The Undertaker will actually wrestle a full match at Mania this year. However, according to rumours, WWE may have a big segment planned for The Undertaker that has actually been in the works for a while.
What could be WWE's plans? If you've watched WWE over the last few months, you'll recall that Elias has been repeatedly interrupted while trying to perform. All this is leading to a big angle at WrestleMania.
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Elias has already been named as the lead musical act at WrestleMania 35 and all this is to set up a segment with The Undertaker. At WrestleMania, there's a good chance that The Undertaker will interfere during Elias segment before laying him out with a Tombstone. Not only will this make fans happy, it will also mean that Taker won't have to compete in a full match.