#4 Ken Shamrock
Formerly ‘The World’s Most Dangerous Man’, Shamrock is a UFC original and a pioneer who paved the way for the MMA’s hulking rise in the United States.
The UFC Hall of Famer was the go-to guy during the early years of the promotion. His battles against Royce Gracie, Dan Severn, and Oleg Taktarov cemented his name as one of the most influential names in UFC history and it wasn’t a surprise that Vince McMahon and co. came knocking as Shamrock’s kept growing.
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He had already tried out pro wrestling before he began practicing MMA but took to pro wrestling seriously after he attained success in MMA.
Shamrock debuted for WWE in 1997 and stayed with the company until the latter half of 1999, winning the WWE Intercontinental Championship and World Tag Team Championship once, and the 1998 King of the Ring Tournament.
Before Kurt Ankle made the Ankle Lock iconic, Shamrock popularized it in a wrestling ring and during his stay in the WWE, was mostly featured as a solid upper mid-card star. He has a win over The Rock, for god’s sake!
Shamrock’s career though hasn’t aged well as his attempts at returning to UFC and WWE have both ended in highly publicised failures.
The WWE doesn't want him back while Dana White would rather pay him to not compete inside the Octagon and there is a good reason behind the same. He has lost nine of his eleven MMA fights since 2005 and is certainly miles away from being a ‘dangerous man’ he was once billed to be.