Mackenzie Dern

Mackenzie Lynne Dern was born on March 24, 1993 in Phoenix, Arizona, the daughter of Wellington "Megaton" Dias, a respected Brazilian jiu-jitsu competitor and coral belt, and stepdaughter of black belt Luciana Tavares. Raised between the United States and Brazil, Dern began training almost as soon as she could walk, drilling with her father and stepmother from early childhood and later working with additional coaches including Royler Gracie and Letícia Ribeiro as her competitive career developed. That early, immersive start is part of what made her subsequent rise so fast: her father awarded her a black belt in December 2012, before she had turned 20, an unusually young promotion even by the standards of a sport where mat time from childhood can accelerate progress considerably.

Once at black belt, Dern's gi career became one of the most dominant in the women's division of that era. She won the IBJJF World Championship in both 2015 and 2016, and in 2015 also captured the IBJJF No-Gi World Championship in the absolute division. That same year she added gold at the ADCC Submission Wrestling World Championship in the -60kg bracket and at the Pan American Championship, and she followed with European Open titles in 2016 and 2017. Taken together, these results made her the only woman to win gold at all five of the IBJJF's major gi tournaments — the World Championship, European Open, Pan American Championship, Brazilian Nationals, and Asian Open — a distinction that reflects sustained excellence across the full women's competitive calendar rather than a single standout performance.

Dern's technical identity at black belt centered on crisp gi grip-fighting and pressure-based guard passing in the Featherweight (Pena) division, translating her strength and pace advantage into consistent positional dominance rather than relying purely on flash submissions. That base carried over directly when she transitioned toward mixed martial arts around 2016-2017, signing with the UFC and making her promotional debut soon after. Her BJJ credentials gave her one of the most feared ground games in the women's strawweight division from the outset of her MMA career, even as she spent several years developing her striking to close the gap with more experienced MMA strikers.

That long development arc paid off in October 2025, when Dern won the vacant UFC Women's Strawweight Championship by defeating Virna Jandiroba at UFC 321, following a 2-4 skid from 2021-2024 that had left her title chances in doubt. She made a successful first title defense against Gillian Robertson at UFC 330 on August 15, 2026, cementing her as one of the sport's pound-for-pound ranked fighters and giving her a rare distinction: a genuine IBJJF world champion who also became a UFC champion, rather than simply a decorated grappler who dabbled in MMA. Dern, who holds both American and Brazilian nationality and competes and speaks fluently in both English and Portuguese, has largely stepped away from IBJJF tournament competition since her move to MMA, though her jiu-jitsu remains the foundation of her fighting style. Her career is frequently cited as a model for how a foundation built entirely inside gi competition, rather than no-gi or wrestling, can still produce an elite, finish-capable martial artist at the highest level of professional MMA.

Pressure-based gi grip fighting and guard passing built from childhood immersion in the sport, later adapted into a submission-heavy ground game in MMA