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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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Jon Jones
Jon Jones won the UFC light heavyweight championship in 2011 at 23, becoming the youngest champion in UFC history at the time, and went on to build the longest unbeaten championship reign at 205 pounds the promotion has ever seen, a run interrupted more by outside-the-cage legal and drug-testing issues than by anything an opponent did to him in the octagon. Jones successfully defended the light heavyweight title a record number of times across two separate championship reigns, and his in-cage résumé includes wins over a run of other former and future UFC champions — a level of quality across his opposition that MMA analysts still cite as the deepest of any champion's title reign in the sport's history. He moved up to heavyweight in 2023 and won the UFC heavyweight championship in his very first fight at the weight, making him only the second fighter in UFC history to hold titles in two different divisions at light heavyweight and heavyweight specifically, and doing it against a murderers' row of opposition that few other two-division champions have faced. Jones's career has been repeatedly interrupted by suspensions, including multiple failed drug tests and legal issues outside the cage, controversies that complicate but haven't erased a technical and physical résumé most rankings still place at or near the top of any pound-for-pound list in the sport's history.
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