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Ronda Rousey
Ronda Rousey won a bronze medal in judo at the 2008 Beijing Olympics before transitioning to mixed martial arts, and became the first women's champion in UFC history when the promotion introduced its bantamweight division specifically to accommodate her in 2012 — women's MMA hadn't existed in the UFC at all until Rousey's dominance made it impossible to ignore. Rousey defended the bantamweight title six times, finishing most of her opponents in the first round using her judo background to secure an armbar submission, a signature finishing sequence so frequently successful that opponents openly discussed strategies built entirely around avoiding it rather than avoiding losing generally. Her string of dominant, often under-a-minute victories made her one of the biggest pay-per-view draws in UFC history regardless of gender, and her mainstream media crossover — magazine covers, film roles, and coverage well outside typical MMA media — is widely credited with proving there was a commercially viable audience for women's fighting at the sport's highest level. Rousey's championship reign ended with back-to-back knockout losses to Holly Holm and Amanda Nunes in 2015 and 2016, a swift decline that closed out her UFC career, but her earlier run remains historically significant less for its length than for having created the entire commercial and competitive framework women's MMA has operated within ever since.
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Amanda Nunes
Amanda Nunes became the first fighter, male or female, to simultaneously hold two UFC championships in different weight classes when she added the featherweight title to her existing bantamweight belt in 2018, a two-division reign she'd go on to defend across both weight classes for years afterward. Nicknamed "The Lioness," Nunes's résumé includes wins over two of the sport's other most dominant former champions: a first-round knockout of Ronda Rousey in 2016 that ended Rousey's UFC career, and a decision win over Cris Cyborg in 2018 that unified the featherweight title — two of the most anticipated superfights in UFC women's division history, both settled decisively in Nunes's favor. Nunes retired in 2023 as the UFC's most decorated women's champion, holding UFC records for most wins in women's bantamweight championship fights and among the longest combined title reigns across two divisions of any fighter, male or female, in the promotion's history. Her combination of knockout power and grappling credentials made her one of the few fighters in either the men's or women's divisions genuinely feared everywhere a fight could go — standing or on the ground — a versatility that underpinned her case as the greatest women's MMA fighter of all time.
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