GILROY, Calif. (June 4, 2014) - The CrossFit nation is introducing its latest athlete, six-time and four-division world champion boxerRobert "The Ghost" Guerrero(31-2-1, 18 KOs), who is returning to the ring on June 21at StubHub Center in Carson, Calif. againstYoshihiro Kamegai(24-1-1, 21 KOs), and on…

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