#2 Former WWE King of the Ring Mabel

Former WWE wrestler Mabel—also known as King Mabel, Viscera, and Big Daddy V, was among the list of monstrous figures who were initially given a push only to be buried or turned into comedic acts later on in their career.
Despite being limited in the ring due to his enormous size and not being a very good in-ring competitor, Vince McMahon was still adamant about pushing Mabel. The late WWE star was booked to win the 1995 King of the Ring tournament, and to get to the crown, he had to get past The Undertaker, which he easily did.
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Despite winning the tournament and earning a WWE Championship match against Kevin Nash, King Mabel's rise declined significantly and he never reached the top of the mountain in WWE.
#1 Tito Santana

During WWE's European tour in 1991, former Intercontinental and tag team champion Tito Santana collided with The Undertaker in a regular match with no build-up.
Santana was portrayed as the babyface and was over with the crowd, and fans cheered loudly for him when he successfully defeated The Phenom in their only match in WWE.
Tito Santana was inducted into the WWE Hall of Fame in 2004 and during his career he accomplished a lot of things including competing in the first nine WrestleMania events.
However, he was never used as a main event level talent in the company, and he didn't have the credibility to beat The Undertaker, who at that time was booked as a dominant performer that was seemingly impervious to pain.
After three piledrivers, Tito pinned The Deadman to win the bout. Looking at what The Undertaker has accomplished throughout his lengthy career, his loss to Tito Santana is probably one that he would like to remain forgotten.