#2 Carla Esparza (Strawweight Championship, 92 days)
Like Dave Menne, Carla Esparza was also the inaugral Champion of her division. Also, similarly to Menne, her reign did not last long.
Esparza became the first ever Strawweight Champion, when she defeated Rose Namujunes in a hugely impressive performance; one that earned her "performance of the night" honours. Submitting the talented, Namujunes via rear naked choke, Esparza had laid a dominant marker for the new division.
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Or so everybody though. Esparza's spell as figurehead of the Strawweights was over almost as soon as it began and she was upended by Joanna Jedrzejczyk via TKO at UFC 185. Esparza has struggled to fight her way back into contention ever since.