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U.F.C. vs. Boxing: Gloves-On, Gloves-Off-Again Rivalry Dates to 1800s – The New York Times
U.F.C. 200 is a milestone event for mixed martial arts, which considers itself a rising contender to boxing. The event comes 127 years after a fight that signaled the rise of modern boxing.
Source: U.F.C. vs. Boxing: Gloves-On, Gloves-Off-Again Rivalry Dates to 1800s - The New York Times