#3 Cain Velasquez
Cain Velasquez made his UFC debut in 2008 and left the promotion earlier this year as a two-time UFC Heavyweight Champion. Throughout this decade-long career in mixed martial arts, Velasquez became one of the biggest stars in the heavyweight division of UFC, with victories over the likes of Brock Lesnar, Junior dos Santos, Antonio Silva, Travis Browne, and other reputed UFC fighters.
The decisive win over The Beast Incarnate at UFC 121 not only earned Velasquez worldwide acclamation but also his first UFC Heavyweight Title. With him signing with WWE, the promotion looks to reignite this feud yet again. The scenario is almost the same, with Brock Lesnar holding the WWE World Championship and Cain Velasquez looking to make a lasting impression on the WWE Universe.
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Will the result of this title defense be the same? We will have to wait till the upcoming Crown Jewel pay-per-view to get the answers.
#2 Ken Shamrock
One of the biggest stars in MMA history, Ken Shamrock, also had a noteworthy run as a pro-wrestler. Shamrock impressed the fans owing to his performances at the first few events promoted by UFC and the feuds he had with Royce Gracie, Dan Severn, Tito Ortiz, and others put him on the map. His dominant fighting style earned him the nickname of 'The World's Most Dangerous Man' as well.
Ken Shamrock joined WWE in 1997. In his wrestling debut, he defeated Vernon White and in the span of a few months, he wrestled the likes of Bret Hart, Owen Hart, The Rock, Vader and members of D-Generation X. In 1998, Shamrock made history by becoming the only UFC fighter who transitioned into pro-wrestling and won WWE's coveted King of the Ring tournament. He also claimed the vacated Intercontinental Championship that year by defeating X-Pac.
Ken Shamrock was also one of the pivotal performers during the era of the Ministry of Darkness and The Corporation. Along with Big Show, Mankind and Test, he debuted The Union stable as well.
Shamrock left WWE in 1999 to focus on his MMA career but briefly joined Impact Wrestling in 2002 and had a run as the NWA World Heavyweight Champion. The UFC Hall of Famer is now an active member of the Impact roster.