#1 The Undertaker's absence

The Undertaker has been a staple when it comes to The Grandest Stage Of Them All. He made his debut at WrestleMania 7 and defeated Jimmy Snuka with ease. Thus the legendary streak kicked off and The Undertaker rarely missed a WrestleMania.
Also read: 5 WWE Superstars who retired at WrestleMania
Is this man the funniest man in wrestling?
If The Phenom misses this year's WrestleMania and doesn't have a match at the last moment like in 2018, this will be the first time in 19 years that it happens.
The last time The Deadman didn't compete at a WrestleMania was way back in 2000, when an injury forced him out of WrestleMania 2000. Ever since then, The Undertaker has been regularly featured in WrestleMania events, with his streak being one of the major selling points of the show and the highlight of the night.
Over the course of his storied career, The Undertaker has missed a total of 2 WrestleManias: WrestleMania X and WrestleMania 2000!