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UFC on Fox 17: dos Anjos vs. Cowboy 2 was a mixed martial arts event that took place on December 19, 2015 at the Amway Center in Orlando, Florida. This was the last UFC event in 2015. The event was headlined by a UFC Lightweight Championship bout between current champion Rafael dos Anjos and top contender Donald Cerrone. Dos Anjos won their first fight at UFC Fight Night: Condit vs. Kampmann 2 by unanimous decision.