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Joanna Jedrzejczyk is widely considered the greatest women’s strawweight fighter in UFC history — and one of the best female fighters of any era. A multiple-time Muay Thai world champion before her MMA career even began, “Joanna Champion” seized the UFC strawweight title in 2015 and defended it five times with a level of technical striking dominance that had never been seen in women’s MMA.

From Poland to Muay Thai World Champion

Joanna Jędrzejczyk was born on August 18, 1987, in Olsztyn, Poland. She began training in combat sports as a teenager and quickly found her calling in Muay Thai. She became a multiple-time world champion in the discipline, winning titles from the major sanctioning bodies and establishing herself as Europe’s premier female striker before she was 25.

That Muay Thai foundation — sharp elbows, precise teeps (push kicks), crisp combinations, and relentless clinch work — would become the cornerstone of her MMA game. She transitioned to mixed martial arts in 2012 and went 5-0 before catching the UFC’s attention.

Capturing the UFC Strawweight Title

Jedrzejczyk fought her way to a UFC title shot against Carla Esparza in March 2015. Esparza had won the first UFC women’s strawweight title through The Ultimate Fighter and was a wrestling specialist. Joanna’s striking was simply on a different level — she stopped Esparza in the second round, becoming the first European-born UFC women’s champion and Poland’s first UFC champion of any kind.

The victory was celebrated in Poland as a national triumph, elevating Jedrzejczyk to superstar status in her home country. She had delivered on every expectation.

Five Title Defenses: Dominant and Definitive

Over the next two years, Jedrzejczyk defended her title five times, each performance more impressive than the last. She defeated Valerie Letourneau, Claudia Gadelha (twice), Karolina Kowalkiewicz, and Jessica Andrade — stopping four of the five and winning every round convincingly.

Her striking output was extraordinary. She routinely landed 100-plus significant strikes per fight, targeting the body and head with combination punching and precise kicks that made opponents look helpless by comparison. Her lateral movement and head position made her difficult to hurt, and her aggression was relentless.

The Decline and the Flyweight Move

In September 2017, Jedrzejczyk faced Rose Namajunas at UFC 217. Namajunas, a significant underdog, landed a head kick and follow-up punches that stopped Jedrzejczyk in the first round — ending her championship reign in stunning fashion. The rematch in April 2018 was controversial (many thought Jedrzejczyk won) but again went to Namajunas by split decision.

Jedrzejczyk moved up to flyweight and challenged Valentina Shevchenko in May 2020 in a fight many consider the greatest women’s MMA bout ever. She lost by split decision in an absolutely brutal, technically brilliant 25-minute war that showcased both fighters at their absolute best. The hematoma that appeared on Jedrzejczyk’s forehead during the fight became one of combat sports’ most striking images.

The Zhang Weili Wars

Jedrzejczyk’s battles with Zhang Weili added another chapter to her legendary career. Their first UFC 248 fight in March 2020 was another fight-of-the-year candidate — five rounds of relentless action that Zhang won by split decision. The second fight at UFC 275 in June 2022 ended more decisively with Zhang stopping Jedrzejczyk in the second round.

After the loss to Zhang, Jedrzejczyk announced her retirement in August 2022, ending a career that had produced some of women’s MMA’s most memorable moments.

Fighting Style: The Muay Thai Queen

Jedrzejczyk’s game was built entirely on elite Muay Thai technique. Her eight-limb proficiency — punches, kicks, knees, and elbows — gave her more weapons than most fighters could defend. Her teeps created distance and disrupted opponent rhythm. Her elbows in the clinch opened cuts. Her combination punching came in rapid-fire bursts that overwhelmed opponents’ defenses.

She was not a grappler by nature, but she improved her takedown defense and submission defense enough to protect herself against wrestlers and grapplers. Her cardio was exceptional — she never slowed down across five-round championship fights.

Legacy

Joanna Jedrzejczyk’s legacy is secure as the greatest strawweight champion in UFC history. Her five title defenses set a divisional record, and the quality of her performances during that run represents the high-water mark of technical striking in women’s MMA. She made combat sports a matter of national pride in Poland and helped establish women’s MMA as a premium attraction worldwide.

Her competitiveness even in defeat — giving Namajunas, Shevchenko, and Zhang their toughest fights — speaks to the depth of her ability. Joanna Champion earned that nickname and will be remembered as one of the sport’s true legends.