#6 Matt Riddle, "The King of Bros"

Despite the fact that Matt Riddle was a successful contestant on the Ultimate Fighter program--the television show that the Ultimate fighting championship uses to screen potential new superstars in the world of Mixed Martial Arts--his UFC career didn't end so well.
Matt Riddle tested positive for Marijuana, which despite growing acceptance in the USA is still considered a performance-enhancing drug. To quote the late, great Robin Williams, the drug might enhance tastes, colours, and sensations, but it's not going to make you fight better unless a Snickers bar is the prize.
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Drummed out of the UFC by a livid Dana White, it seemed like Riddle had been dealt a fatal blow to his career. However, Riddle was undaunted and even managed to keep a positive attitude about his firing. He switched to wrestling and became an instant sensation.
Now signed with NXT, the King of Bros could be the WWE's breakout star of 2018.