Mizanin first gained fame as a cast member on MTV's "The Real World: Back to New York," which first aired in 2001, and its spinoff series, "Real World/Road Rules Challenge." He later entered the fourth season of "Tough Enough," a televised competition that awarded the winner a WWE contract.

Mizanin has also made appearances on television shows including "Battle of the Network Reality Stars," "Fear Factor," "Identity," "Ghost Hunters," "Dinner: Impossible," "Psych" and "Are You Smarter Than a 5th Grader?."

Mizanin trained and wrestled with Ultimate Pro Wrestling and Deep South Wrestling, where he became the first Deep South Heavyweight Champion. Mizanin was sent to Ohio Valley Wrestling (OVW), working in tag team matches and winning the tag team title, the OVW Southern Tag Team Championship, on one occasion.

Mizanin became host of the annual WWE Diva Search competition in 2006. Following his hosting duties, Mizanin made his wrestling debut in September 2006, as a villain who went undefeated. In 2007, was drafted from SmackDown to the ECW brand, where he formed a partnership with John Morrison, in which the two were the only tag team on the ECW brand to ever hold a tag team title, and were the only one to hold both Smackdown's WWE Tag Team Championship and Raw's World Tag Team Championship. He was drafted to the Raw brand as part of the 2009 WWE Draft, and won the WWE United States Championships. He also won WWE Unified Tag Team Championship with The Big Show and the WWE Tag Team Championship with John Cena.

In July 2010, he won the second ever Raw brand exclusive Money in the Bank ladder match at the first WWE Money in the Bank pay-per-view, earning a contract for a WWE Title match, which he used in November to win the WWE Championship, which he held for six months. In 2012, The Miz captured WWE Intercontinental Championship, which made him the 25th Triple Crown Champion of the company.

The Miz was named as an announcer for Main Event in 2012. He then claimed his second Intercontinental Championship during the pre-show of WrestleMania 29.

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