Dern is 6-0 as a mixed martial artist. Dern stepped onto the scale and was closer to the flyweight limit than strawweight which is the 116-pound.
In 2016, Dern weighed 118.8 pounds for a Legacy FC bout, and in 2017, tipped the scale at 120 pounds for an LFA bout. She came at whopping 123 pounds, seven pounds over the non-title limit for the weight class. The fights went on as planned under a catchweight, and Dern won both. The Brazilian MMA Athletic Commission (CABMMA) fined Dern 10-percent of her purse, while the UFC docked her an additional 20-percent. Dern wanted to make the quick turn around for this fight at UFC 224 because it was in her adopted hometown of Rio de Janerio. The combined 30-percent of Dern's show money will reportedly go to Cooper. Opponents sound off and face off: strawweights Mackenzie Dern and Amanda Cooper; former champions Lyoto Machida and Vitor Belfort; middleweights Jacare Souza and Kelvin Gastelum; and women's bantamweight champion Amanda Nunes and challenger Raquel Pennington.