#1 The Undertaker
The Undertaker has put down a long string of WWE Superstars over the past three decades, on his way to becoming a legend. One Superstar who always had his number though was Brock Lesnar. During their first feud in late 2002, Lesnar came out victorious when he beat The Undertaker inside Hell in a Cell to retain his WWE title. Fans might remember The Undertaker challenging Brock Lesnar to a fight at UFC 121, immediately after the latter's loss to Cain Velasquez.
Lesnar wasn't too happy with the comment and opened up on his real-life heat with The Undertaker in an interview with Ariel Helwani months later.
A top AEW star just called one of his colleagues 'spoiled' and 'narcissistic' HERE.
Once again, I enjoyed working with Mark in the ring but me and him….. Well, there were some things said that kinda really pi**ed me off.
I don’t know what he wanted to do. Maybe he was trying to fight. I don’t know if he was there to fight or what or if he was there to get some attention or what, I don’t know.
These guys (pro wrestlers) were part of my life years ago and I think they see me having success outside of their universe that they can’t do……
Brock Lesnar also confirmed that the duo has legit beef.
It is. It is a legit (beef). I got a problem with him.
Brock Lesnar later returned to WWE and had a lengthy feud with The Undertaker
Lesnar came back to WWE in 2012 and resumed his feud with The Undertaker on the road to WrestleMania 30. At the event, Brock Lesnar became the first man to defeat The Undertaker at WrestleMania, after the latter had won 21 straight matches at the event. The rivalry continued in 2015 and ended when Lesnar defeated The Deadman inside Hell in a Cell.