#2 Three time World Champion
When CM Punk defeated John Cena at Money in the Bank 2011 to win his first WWE Championship, he became the second WWE Superstar after Kane to have reigned as the World Heavyweight Champion (WWE’s version), WWE Champion, and ECW Champion (WWE’s version).
Although Big Show won these 3 titles as well, he didn’t win WWE’s version of the World Heavyweight Championship until 2012, and only reigned as the WCW World Champion in the 1990’s.
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CM Punk, on the other hand, won all these World Championships in WWE in under 4 years, but it took Kane 12 years to achieve this feat.
CM Punk won the ECW Championship from John Morrison in August 2007, won his first World Heavyweight Championship in June 2008, and dethroned John Cena to claim his first WWE Championship in July 2011.
This is a rare feat, only achieved by 3 superstars, CM Punk, Kane and Big Show. Big Show defeated Sheamus in October 2012 to win WWE’s version of World Heavyweight Championship.