#3 The Undertaker's amazing in-ring abilities and iconic matches
You can't be called the greatest WWE Superstar of all-time if you can't impress the fans by your in-ring abilities. And The Undertaker checks this box as well thanks to his exceptional skills inside the ring. Of course, he hasn't been in his best shape for the last few years, but in his prime, he was one of the best wrestlers on the roster. He amazed everyone by his athletic abilities, considering his size as he is a proper heavyweight.
The Phenom has some of the most legendary moves in his arsenal with the Chokeslam and the Tombstone Piledriver always getting the audience off their seats. Not to forget, the deadly Hell's Gate triangle choke submission, which is good enough to make your opponent pass-out in a real fight as well.
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Throughout his career, he has had numerous iconic feuds and matches. If we talk about the Greatest WWE match of all time, many fans consider it to be The Undertaker's WrestleMania 25 encounter against Shawn Michaels (Sorry, Randy Orton, and Edge). Other than that, he also had memorable feuds against the likes of Triple H, Mick Foley, Brock Lesnar, and many others.
There have been so many great moments in his career that it is tough to pick one of them and call it the greatest!