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UFC Lightweight Champion Anthony Pettis has suffered a knee injury and is off the UFC On Fox IX card, where he was set to defend the gold against Josh Thomson in the main event. With that being said, UFC Flyweight Champion Demetrious Johnson versus Joseph Benavidez, originally set to headline the UFC Ultimate Fighter 18 Finale is now going to headline UFC On Fox IX. Also, a bout between Nate Diaz and Gray Maynard will headline the UFC Ultimate Fighter 18 Finale after all the card changes, it was originally set as a main card bout anyways.
