This past weekend UFC's Rashad Evans took to Twitter to take shots at Jon Jones. MMA fighters taking brutal shots at one another inside and outside of the octagon is nothing new, but what makes this more intriguing is that Jones and Evans were training partners and friends not long ago. But these dudes aren't the only athletes to go from friends to enemies, from MMA to baseball to boxing there's been tons of sports friendships that have turned sour. From Kobe and Shaq to Ali and Frazier, check out the 10 Biggest Frenemies in Sports History...

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