Rose Namajunas: Mackenzie Dern needs to “get her s**t together”

Last weekend, on the main card of UFC 224, BJJ star Mackenzie Dern stepped into the Octagon for the second time, taking on Amanda Bobby Cooper. Dern won this fight in emphatic fashion, dropping her foe with a huge punch in the first round, then sinking in a deep rear-naked choke for the win.

Unfortunately, Dern’s win over Cooper comes with an asterisk attached, as she tipped the scales at 123 pounds, a significant seven

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