Considering Cooper is now essentially a "strawweight vs flyweight", it's no wonder Cooper is perturbed with Dern's extra 7.4 pounds.
The 25-year-old Dern is a rising star in UFC with a ideal professional record of 6-0. Still, Cooper accepted the fight after taking 30-percent of Dern's purse as punishment.
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Attempting to get out of harm's way, Cooper rolled but gave up her back to Dern who immediately locked in a rear-naked choke forcing Cooper to tap out.
Despite the weigh-in slip-up by Dern, she and Cooper will still be part of a main card that will be main-evented by Amanda Nunes defending her bantamweight title against Raquel Pennington.
Cooper won her last fight in her hometown of Detroit, knocking out Angela Magana at UFC 218.
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UFC women's strawweight standout Felice Herrig also took to social media to slam Dern.
According to MMA Junkie's Mike Bohn, Dern is the 11th UFC fighter to miss weight this year and her overage is the largest of the group, with all but one of the others coming in less than four pounds overweight.
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