I read that Triple H faced Stone Cold in 2001 in the first 3 Stages of Hell match.

K thanks

If I’m not mistaken, Cena vs Eddie was the first parking lot brawl, or Triple H vs Undertaker.

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No holds barred matches go back to the beginning of pro wrestling so it's almost impossible to tell who was in the first one since places all over the world probably had them and came up with the idea independently of each other.