#3 Christian
Surprisingly, Christian won his first World Championship in TNA despite having spent almost 8 years in the WWE before moving to the company. Going by the name of Christian Cage, he was seen as a major coup by TNA and was one of the first big stars to jump ship from the WWE.
After getting frustrated for years in the WWE midcard, Christian finally managed to capture the first World Championship of his career by beating Jeff Jarrett at the Against All Odds pay-per-view event in 2006.
Corey Graves deleted his Tweet! More details HERE.
He would win the NWA World Heavyweight Championship, which was being used by TNA as their primary title at the time, again in 2007 and would remain a top guy in the company for the rest of his run before returning to the WWE in 2009.
Despite winning the ECW Championship after his return, it seemed that a world championship would elude Christian again. But after Edge's surprise retirement in 2011, he would go on to capture the WWE World Heavyweight Championship vacated by his best friend at the Extreme Rules pay-per-view. In the process, he finally achieved his lifelong dream of being a World Champion in the WWE.