The current TNA X-Division Champion Leon Slater recently etched his name in the history books of WWE. He was in action on a recent show organized by the Stamford-based promotion.At this year's NXT Deadline, Leon Slater locked horns with Je'Von Evans, Joe Hendry, Dion Lennox, and Myles Borne in the Men's Iron Survivor Challenge. All of the stars involved in the bout put on an incredible display of action inside the ring, and for the most part, it was an equal contest. However, the match ultimately ended in Evans' favor, and he is now the number one contender for the NXT Championship. Despite losing at Deadline, Leon Slater has made WWE history. The TNA X-Division Champion has become the first person contracted to TNA Wrestling to compete in the NXT Iron Survivor Challenge.WWE legend John Cena had some huge praise for TNA star Leon SlaterLast month, John Cena made an appearance in a pre-taped segment on WWE NXT to announce the participants of the Men's and Women's Iron Survivor Challenge. During this, Cena labeled Leon Slater and Je'Von Evans as the future of the wrestling business.The 17-time World Champion also mentioned that he believed the two stars were way ahead of their time and were extremely "fun to watch" on TV."When you talk about the future of this business, no two names come to mind faster than Je'Von Evans and Leon Slater from TNA. A pair of 21-year-olds who are way ahead of their time, fun to watch, and look to big things at the road ahead."Many believe Leon Slater will end up signing with World Wrestling Entertainment's developmental brand, NXT, similar to the latest signing of former TNA star Joe Hendry. It will be interesting to see if Shawn Michaels has planned anything for Slater's potential future on the black-and-silver brand.