Jan Maciej BÃ Âachowicz (; born 24 February 1983) is a Polish professional mixed martial artist. He currently competes in the Light Heavyweight division of the Ultimate Fighting Championship (UFC), where he is a former UFC Light Heavyweight Champion. BÃ Âachowicz is the second Polish fighter to win a UFC title after Joanna JÃÂdrzejczyk and the first male Polish champion. A professional since 2007, he also competed for KSW and is the former KSW Light Heavyweight Champion. As of 28 October 2025, he is #5 in the UFC light heavyweight rankings.
Growing up in Cieszyn, Poland, Bà Âachowicz started training in martial arts â initially judo at the age of nine â due to the influence of action movies, he also did grappling, muay thai (where he achieved 34 wins) and won tournaments in both sports before transitioning into mixed martial arts.
BÃ Âachowicz entered in KSWs inaugural <95 kg (209 lb) Tournament at KSW 9. Defeating three opponents in one night, BÃ Âachowicz was able to claim the tournament crown. His first opponent was Martin Zawada, who he defeated by unanimous decision. BÃ Âachowicz was able to defeat his next two opponents by armbar, including the notable opponent Antoni Chmielewski.
BÃ Âachowicz went on to defeat Christian M'Pumbu four months later via armbar, before defeating previously unbeaten Maro Perak in December 2008.
Looking to expand his horizons after the very successful year 2008, BÃ Âachowicz accepted the invitation of Tomasz Drwal and joined him at the Throwdown Training Center in San Diego for a few months. He agreed to temporarily fight at Heavyweight, against Lloyd Marshbanks under the War Gods banner, but the event was canceled. Despite suffering a serious knee injury in July, BÃ Âachowicz continued his training, as he agreed to fight "somewhere in Mexico". About three weeks later, his knee suddenly popped in training when executing a takedown. The anterior cruciate ligament in his right knee was destroyed, making a knee reconstruction after his return to Poland inevitable.
Bà Âachowicz was planning his comeback fight in March against Aleksandar Radosavljevic at WFC 10, but decided to withdraw and was replaced by fellow KSW TEAM member Antoni Chmielewski. After finally returning from the knee injury and 17 months layoff, Bà Âachowicz entered into the second KSW <95 kg tournament. Bà Âachowicz had to face two opponents in the same night. His first opponent was the undefeated Brazilian Julio Brutus. Bà Âachowicz was able to knock Brutus out with a high kick-right hook combination at 3:40 in the first round. In the semifinal, Bà Âachowicz submitted his training partner Wojciech Orà Âowski with a rear-naked choke after just 1:37.
In the meantime, BÃ Âachowicz took a fight on a few days notice against Nikolai Onikienko and submitted him in the second round.
He then faced Daniel Tabera in the final of the tournament at KSW XIV, winning via TKO in the second round and becoming once again the KSW Light Heavyweight Tournament Champion. BÃ Âachowicz then faced Rameau Thierry Sokoudjou for the vacant KSW Light Heavyweight Championship at KSW XV. He lost the fight via TKO, being unable to answer the bell for the third round because of his injured leg.
BÃ Âachowicz had a rematch with Sokoudjou at KSW XVII. He won the bout via unanimous decision to become the new KSW Light Heavyweight Champion. His next three fights in KSW were against Mario Miranda, Houston Alexander and Goran Reljic, and all three he won by unanimous decision.
In January 2014, after completing a 17âÂÂ3 record on the European scene, Bà Âachowicz signed a contract to fight in the light heavyweight division of the UFC.
In his UFC debut, BÃ Âachowicz faced Ilir Latifi on October 4, 2014, at UFC Fight Night 53. He won the fight via TKO in the first round.
BÃ Âachowicz faced Jimi Manuwa on April 11, 2015, at UFC Fight Night 64. BÃ Âachowicz lost the fight via unanimous decision.
BÃ Âachowicz was expected to face Anthony Johnson on September 5, 2015, at UFC 191. However, Johnson was pulled from the bout on July 30 in favor of a fight with Jimi Manuwa at the event. In turn, BÃ Âachowicz instead faced Corey Anderson on the same card. He lost the fight via unanimous decision.
BÃ Âachowicz next faced Igor Pokrajac on April 10, 2016, at UFC Fight Night 86. He won the fight via unanimous decision.
BÃ Âachowicz faced Alexander Gustafsson on September 3, 2016, at UFC Fight Night 93. He lost the fight via unanimous decision.
BÃ Âachowicz was expected to face Ovince Saint Preux on February 4, 2017, at UFC Fight Night 104. However, he pulled out on January 21 due to injury and was replaced by promotional newcomer Volkan Oezdemir.
BÃ Âachowicz was quickly rescheduled and faced Patrick Cummins on April 8, 2017, at UFC 210. After a strong first round where he rocked Cummins on multiple occasions, BÃ Âachowicz soon fell to Cummins' wrestling and his own lack of stamina in the second and third rounds. He lost the fight via majority decision.
BÃ Âachowicz faced Devin Clark on October 21, 2017, at . He won the fight via rear-naked choke submission in the second round. This win earned him the Performance of the Night award.
BÃ Âachowicz faced Jared Cannonier on December 16, 2017, at UFC on Fox 26. He won the fight via unanimous decision.
BÃ Âachowicz faced Jimi Manuwa in a rematch on March 17, 2018, at UFC Fight Night 127. He won the fight via unanimous decision. The win also earned him his first Fight of the Night bonus award.
BÃ Âachowicz faced Nikita Krylov on September 15, 2018, at UFC Fight Night 136. He won the fight via arm-triangle choke submission in the second round. This win earned him the Performance of the Night award.
BÃ Âachowicz faced Thiago Santos on February 23, 2019, at UFC Fight Night 145. BÃ Âachowicz was caught with a counter in the third round and lost by TKO, marking the first time in his MMA career that he has been stopped due to strikes.
BÃ Âachowicz faced Luke Rockhold on July 6, 2019, at UFC 239. He won the fight via knockout in the second round. This win earned him the Performance of the Night award.
BÃ Âachowicz then faced Ronaldo Souza on November 16, 2019, at UFC Fight Night 164. He won the fight by a split decision.
BÃ Âachowicz faced Corey Anderson on February 15, 2020, at UFC Fight Night 167 in a rematch of their previous bout. BÃ Âachowicz won the bout via first-round knockout. The victory earned him his fourth Performance of the Night bonus award.
BÃ Âachowicz faced Dominick Reyes for the vacant UFC Light Heavyweight Championship on September 27, 2020, at UFC 253. He won the fight via TKO in the second round. This win earned him the Performance of the Night award.
BÃ Âachowicz faced UFC Middleweight Champion Israel Adesanya for his first title defense on March 6, 2021, at UFC 259. He won the fight via unanimous decision, becoming the first person to defeat Adesanya in the UFC.
BÃ Âachowicz was expected to make his second title defense against Glover Teixeira at UFC 266 on September 25, 2021. However, the bout was postponed and moved to October 30, 2021, at UFC 267. BÃ Âachowicz lost the fight and the title via second-round rear-naked choke submission.
BÃ Âachowicz was scheduled to face Aleksandar RakiÃÂ on March 26, 2022, at UFC on ESPN 33. However, in late January, BÃ Âachowicz withdrew due to injury and the bout was rescheduled for UFC on ESPN 36 on May 14, 2022. BÃ Âachowicz won the fight via technical knockout after RakiÃÂ was rendered unable to continue in the third round due to a knee injury.
BÃ Âachowicz faced off against Magomed Ankalaev on December 10, 2022, at UFC 282 for the vacant UFC Light Heavyweight Championship. The fight ended in a controversial split draw. 23 out of 25 media members scored the fight as a win for Ankalaev.
BÃ Âachowicz faced former UFC Middleweight champion Alex Pereira on July 29, 2023 at UFC 291. He lost the back-and-forth fight via split decision. 22 out of 26 media outlets scored the bout for Pereira.
BÃ Âachowicz was scheduled to face Aleksandar RakiÃÂ in a rematch on January 20, 2024, at UFC 297. However, BÃ Âachowicz withdrew due to shoulder surgery.
BÃ Âachowicz faced Carlos Ulberg on March 22, 2025, at UFC Fight Night 255. He lost the close fight by unanimous decision. 8 out of 12 media outlets scored the bout for Ulberg.
BÃ Âachowicz was scheduled to face Bogdan Guskov on November 22, 2025, at UFC Fight Night 265. However, for unknown reasons, it was moved and took place on December 6, 2025, at UFC 323. The bout ended in a majority draw.
BÃ Âachowicz is scheduled to face Bogdan Guskov in a rematch on May 9, 2026 at UFC 328.
Bà Âachowicz is a close friend of former UFC fighter Tomasz Drwal. They were training together at the Throwdown Training Center in San Diego when he suffered his knee injury in 2009. Some time ago he moved to Warsaw with his girlfriend, changing his long-time club Octagon Rybnik to Paweà  Nastula's club. He also occasionally trains in Alliance MMA with names such as Alexander Gustafsson, Phil Davis, Joey Beltran, and Dominick Cruz.
BÃ Âachowicz confirmed the birth of his son in December 2020.
|- |Draw |align=center|29âÂÂ11âÂÂ2 |Bogdan Guskov |Draw (majority) |UFC 323 | |align=center|3 |align=center|5:00 |Las Vegas, Nevada, United States | |- |Loss |align=center|29âÂÂ11âÂÂ1 |Carlos Ulberg |Decision (unanimous) | | |align=center|3 |align=center|5:00 |London, England | |- |Loss |align=center| |Alex Pereira |Decision (split) |UFC 291 | |align=center|3 |align=center|5:00 |Salt Lake City, Utah, United States | |- |Draw |align=center|29âÂÂ9âÂÂ1 |Magomed Ankalaev |Draw (split) |UFC 282 | |align=center|5 |align=center|5:00 |Las Vegas, Nevada, United States | |- |Win |align=center|29âÂÂ9 |Aleksandar Rakià|TKO (knee injury) | | |align=center|3 |align=center|1:11 |Las Vegas, Nevada, United States | |- |Loss |align=center|28âÂÂ9 |Glover Teixeira |Submission (rear-naked choke) |UFC 267 | |align=center|2 |align=center|3:02 |Abu Dhabi, United Arab Emirates | |- |Win |align=center|28âÂÂ8 |Israel Adesanya |Decision (unanimous) |UFC 259 | |align=center|5 |align=center|5:00 |Las Vegas, Nevada, United States | |- |Win |align=center|27âÂÂ8 |Dominick Reyes |TKO (punches) |UFC 253 | |align=center|2 |align=center|4:36 |Abu Dhabi, United Arab Emirates | |- |Win |align=center|26âÂÂ8 |Corey Anderson |KO (punch) | | |align=center|1 |align=center|3:08 |Rio Rancho, New Mexico, United States | |- |Win |align=center|25âÂÂ8 |Ronaldo Souza |Decision (split) | | |align=center|5 |align=center|5:00 |São Paulo, Brazil | |- |Win |align=center|24âÂÂ8 |Luke Rockhold |KO (punches) |UFC 239 | |align=center|2 |align=center|1:39 |Las Vegas, Nevada, United States | |- |Loss |align=center|23âÂÂ8 |Thiago Santos |TKO (punches) | | |align=center|3 |align=center|0:39 |Prague, Czech Republic | |- |Win |align=center|23âÂÂ7 |Nikita Krylov |Submission (arm-triangle choke) | | |align=center|2 |align=center|2:41 |Moscow, Russia | |- |Win |align=center|22âÂÂ7 |Jimi Manuwa |Decision (unanimous) | | |align=center|3 |align=center|5:00 |London, England | |- |Win |align=center|21âÂÂ7 |Jared Cannonier |Decision (unanimous) | | |align=center|3 |align=center|5:00 |Winnipeg, Manitoba, Canada | |- |Win |align=center|20âÂÂ7 |Devin Clark |Submission (rear-naked choke) | | |align=center|2 |align=center|3:02 |Gdaà Âsk, Poland | |- |Loss |align=center|19âÂÂ7 |Patrick Cummins |Decision (majority) |UFC 210 | |align=center|3 |align=center|5:00 |Buffalo, New York, United States | |- |Loss |align=center|19âÂÂ6 |Alexander Gustafsson |Decision (unanimous) | | |align=center|3 |align=center|5:00 |Hamburg, Germany | |- |Win |align=center|19âÂÂ5 |Igor Pokrajac |Decision (unanimous) | | |align=center|3 |align=center|5:00 |Zagreb, Croatia | |- | Loss | align=center| 18âÂÂ5 | Corey Anderson | Decision (unanimous) | UFC 191 | | align=center| 3 | align=center| 5:00 | Las Vegas, Nevada, United States | |- | Loss | align=center| 18âÂÂ4 | Jimi Manuwa | Decision (unanimous) | | | align=center| 3 | align=center| 5:00 | Kraków, Poland | |- | Win | align=center| 18âÂÂ3 | Ilir Latifi | TKO (body kick and punches) | | | align=center| 1 | align=center| 1:58 | Stockholm, Sweden | |- | Win | align=center| 17âÂÂ3 | Goran Reljià| Decision (unanimous) | | | align=center| 3 | align=center| 5:00 | Warsaw, Poland | |- | Win | align=center| 16âÂÂ3 | Houston Alexander | Decision (unanimous) | KSW 20 | | align=center| 3 | align=center| 5:00 | Gdaà Âsk, Poland | |- | Win | align=center| 15âÂÂ3 | Mario Miranda | Decision (unanimous) | KSW 18 | | align=center| 3 | align=center| 5:00 | Pà Âock, Poland | |- | Win | align=center| 14âÂÂ3 | Rameau Thierry Sokoudjou | Decision (unanimous) | | | align=center| 3 | align=center| 5:00 | à Âódà º, Poland | |- | Win | align=center| 13âÂÂ3 | Toni Valtonen | Submission (rear-naked choke) | | | align=center| 2 | align=center| 1:23 | Gdaà Âsk, Poland | |- | Loss | align=center| 12âÂÂ3 | Rameau Thierry Sokoudjou | TKO (retirement) | | | align=center| 2 | align=center| 5:00 | Warsaw, Poland | |- | Win | align=center| 12âÂÂ2 | Daniel Tabera | TKO (punches) | | | align=center| 2 | align=center| 4:20 | à Âódà º, Poland | |- | Win | align=center| 11âÂÂ2 | Nikolai Onikienko | Submission (rear-naked choke) | Modern Fighting Pankration: Volga Cup 2010 | | align=center| 2 | align=center| 2:32 | Cheboksary, Russia | |- | Win | align=center| 10âÂÂ2 | Wojciech Orà Âowski | Submission (rear-naked choke) | rowspan=2| | rowspan=2| | align=center| 1 | align=center| 1:37 | rowspan=2| Katowice, Poland | |- | Win | align=center| 9âÂÂ2 | Julio Brutus | KO (head kick and punch) | align=center| 1 | align=center| 3:40 | |- | Win | align=center| 8âÂÂ2 | Maro Perak | Submission (rear-naked choke) | | | align=center| 2 | align=center| 1:51 | Warsaw, Poland | |- | Win | align=center| 7âÂÂ2 | Christian M'Pumbu | Submission (armbar) | KSW Extra | | align=center| 2 | align=center| 3:12 | Dàbrowa Górnicza, Poland | |- | Win | align=center| 6âÂÂ2 | Aziz Karaoglu | Submission (armbar) | rowspan=3| | rowspan=3| | align=center| 1 | align=center| 4:13 | rowspan=3| Warsaw, Poland | |- | Win | align=center| 5âÂÂ2 | Antoni Chmielewski | Submission (armbar) | align=center| 2 | align=center| 2:54 | |- | Win | align=center| 4âÂÂ2 | Martin Zawada | Decision (unanimous) | align=center| 2 | align=center| 5:00 | |- | Loss | align=center| 3âÂÂ2 | Andre Fyeet | Submission (kimura) | | | align=center| 1 | align=center| 1:57 | Warsaw, Poland | |- | Win | align=center| 3âÂÂ1 | Daniel Dowda | TKO (knee and punches) | rowspan=3| KSW Elimination | rowspan=3| | align=center| 1 | align=center| 1:35 | rowspan=3| Wrocà Âaw, Poland | |- | Win | align=center| 2âÂÂ1 | Pawel Gasinski | TKO (punches) | align=center| 1 | align=center| 2:36 | |- | Win | align=center| 1âÂÂ1 | Sebastian Olchawa | Decision (unanimous) | align=center| 2 | align=center| 5:00 | |- | Loss | align=center| 0âÂÂ1 | Marcin Krysztofiak | Decision (unanimous) | Full Contact Prestige 3 | | align=center| 2 | align=center| 5:00 | Poznaà Â, Poland |