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Coach Marc Contreras on ABNER MARES - EsNews Boxing

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Carl Froch vs Chavez Jr Trainer Marco Contreras Breaks It Down - EsNews Boxing

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Alexander Besputin working with coach Marc Contreras RGBA Oxnard - EsNews Boxing

Coach Marc Contreras RGBA breaks down Canelo Chavez jr - EsNews Boxing

Vasyl Lomachenko On How Marco Contreras Wraps Hands EsNews Boxing

Coach Marc Contreras talks new members Olympic Gold Medalist at the gym in Oxnard - esnews boxing

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