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World Series of Fighting 4: Spong vs. DeAnda was a mixed martial arts event held August 10, 2013 in Ontario, California, United States.
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World Series of Fighting, also known as WSOF, is an American mixed martial arts (MMA) promotion based in Las Vegas, Nevada. The inaugural WSOF event took place on November 3, 2012 and the main card was broadcast on the NBC Sports Network.
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