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World Series of Fighting (WSOF) 4 fight card and rumors for Aug. 10 in Ontario, Calif.

World Series of Fighting (WSOF), the upstart mixed martial arts (MMA) promotion headed by kickboxing legend Ray Sefo, is poised to make its return in Ontario, Calif., via NBC Sports Network on Sat., Aug. 10, 2013. Check out the latest WSOF 4 fight card and rumors below.

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