Mark Zuckerberg watches as Yan Xiaonan's submission defense shines in impressive win over Mackenzie Dern

Mark Zuckerberg watches as Yan Xiaonan's submission defense shines in impressive win over Mackenzie Dern

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Yan Xiaonan's submission defense led her to a majority decision victory over Mackenzie Dern on Saturday at Apex in front of Facebook CEO Mark Zuckerberg.

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