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Refereed by Mario Yamasaki

Professional mixed martial arts referee Mario Yamasaki is easily one of the most experienced refs working in top-flight MMA today. His resume stretches all the way back to UFC 20, broadcast from Birmingham, Alabama in May of 1999, where Yamasaki presided over Brazilian youngster Wanderlei Silva's first win in the Octagon. Since that time, Yamasaki has refereed close to 200 matches in major MMA promotions. While the vast majority have come under the Ultimate Fighting Championship banner, Yamasaki also boasts experience reffing in Strikeforce and EliteXC. And when Pride Fighting Championships held one of its final events, Pride 33, in Las Vegas, Nevada, Yamasaki became one of only two men alongside Steve Mazzagatti to ever ref fights in both Pride FC and the UFC. Yamasaki officiated two bouts that night in February 2007: James Lee vs. Travis Wiuff, and Sergei Kharitonov vs. Mike Russow.

Yamasaki was born on December 14, 1963 in Sao Paulo, Brazil. He has spent his entire life deeply involved in the martial arts, beginning from a Judo background passed down to him from his father, an 8th dan red-and-white belt. From the age of 22 Yamasaki has also studied Brazilian Jiu-Jitsu. Yamasaki continues to practice both arts, and is currently a 4th dan black belt in Judo and a 4th degree black belt in Brazilian Jiu-Jitsu. He also owns and maintains a system of BJJ academies based near his family's home in Pennsylvania.

Yamasaki's ring decisions have generally been met with approval, though like any ref in the business long enough, some calls have been criticized. One missed call by Yamasaki in particular led, paradoxically, to one of the greatest moments in MMA history, after he failed to witness Frank Trigg knee Matt Hughes to the groin at UFC 52 in April 2005. Yamasaki let the fight continue as Hughes crumpled to the canvas, but Hughes battled back valiantly to finish Trigg by RNC. Had Yamasaki caught the foul, one of the greatest comeback wins in UFC history might never have occurred.

Yamasaki has officiated some of the most legendary fights in MMA history, including Brock Lesnar's championship win over Randy Couture at UFC 91, BJ Penn's knockout of Sean Sherk at UFC 84, and Chuck Liddell's second TKO victory over Tito Ortiz in the Main Event at UFC 66, the first MMA pay-per-view to ever top 1,000,000 buys. Portions of this article draw on information from Mario Yamasaki's page on Wikipedia, available at en.wikipedia.org/wiki/mario_yamasaki.

Refereed by Mario Yamasaki

Bout   Event   Date   Org
Damir Hadžović vs. Alan Patrick UFC Fight Night 125 2018.02.03
Valentina Shevchenko vs. Priscila Cachoeira UFC Fight Night 125 2018.02.03
Alex White vs. James Krause UFC Fight Night 124 2018.01.14
Paige VanZant vs. Jessica-Rose Clark UFC Fight Night 124 2018.01.14
Irene Aldana vs. Talita Bernardo UFC Fight Night 124 2018.01.14
Daniel Gallemore vs. Mike Kyle PFL 2017.11.02
Timur Valiev vs. Josenaldo Silva PFL 2017.11.02
Lance Palmer vs. Steven Siler PFL 2017.11.02
Blagoi Ivanov vs. Caio Alencar PFL 2017.11.02
Pedro Munhoz vs. Rob Font UFC Fight Night 119 2017.10.28
Jarred Brooks vs. Deiveson Figueiredo UFC Fight Night 119 2017.10.28
John Lineker vs. Marlon Vera UFC Fight Night 119 2017.10.28
Luan Matheus vs. Jafel Filho Shooto Brasil 74 2017.08.27
Luciano Benicio vs. Geraldo de Freitas Shooto Brasil 74 2017.08.27
Bruno Malfacine vs. Romario Boaes Shooto Brasil 74 2017.08.27
Diego Huerto vs. Marlon Sandro Shooto Brasil 74 2017.08.27
Mike Chiesa vs. Kevin Lee UFC Fight Night 112 2017.06.25
Jeremy Kimball vs. Josh Stansbury UFC Fight Night 112 2017.06.25
Alex Garcia vs. Tim Means UFC Fight Night 112 2017.06.25
Carla Esparza vs. Maryna Moroz UFC Fight Night 112 2017.06.25
Karolina Kowalkiewicz vs. Cláudia Gadelha UFC 212 2017.06.03
Matthew Lopez vs. Johnny Eduardo UFC 212 2017.06.03
Viviane Pereira vs. Jamie Moyle UFC 212 2017.06.03
Bobby Green vs. Rashid Magomedov UFC on FOX 24 2017.04.15
Aljamain Sterling vs. Augusto Mendes UFC on FOX 24 2017.04.15
Ronaldo Souza vs. Robert Whittaker UFC on FOX 24 2017.04.15
Gian Villante vs. Maurício Rua UFC Fight Night 106 2017.03.11
Kevin Lee vs. Francisco Trinaldo UFC Fight Night 106 2017.03.11
Ray Borg vs. Jussier Formiga UFC Fight Night 106 2017.03.11
Aiemann Zahabi vs. Reginaldo Vieira UFC Fight Night 105 2017.02.19
Derrick Lewis vs. Travis Browne UFC Fight Night 105 2017.02.19
Sara McMann vs. Gina Mazany UFC Fight Night 105 2017.02.19
Antônio Rogério Nogueira vs. Ryan Bader II UFC Fight Night 100 2016.11.19
Thales Leites vs. Krzysztof Jotko UFC Fight Night 100 2016.11.19
Johnny Eduardo vs. Manny Gamburyan UFC Fight Night 100 2016.11.19
Liz Carmouche vs. Katlyn Chookagian UFC 205 2016.11.12
Yoel Romero vs. Chris Weidman UFC 205 2016.11.12
Diego Sanchez vs. Marcin Held UFC Fight Night 98 2016.11.05
Erik Perez vs. Felipe Arantes UFC Fight Night 98 2016.11.05
Jason Novelli vs. Polo Reyes UFC Fight Night 98 2016.11.05
Lina Länsberg vs. Cristiane Justino UFC Fight Night 95 2016.09.24
Alan Patrick vs. Stevie Ray UFC Fight Night 95 2016.09.24
Mike De La Torre vs. Godofredo Pepey UFC Fight Night 95 2016.09.24
Maurício Rua vs. Corey Anderson UFC 198 2016.05.14
Matt Brown vs. Demian Maia UFC 198 2016.05.14
Donald Cerrone vs. Alex Oliveira UFC Fight Night 83 2016.02.21
Cody Garbrandt vs. Augusto Mendes UFC Fight Night 83 2016.02.21
Chris Camozzi vs. Joe Riggs UFC Fight Night 83 2016.02.21
Albert Tumenov vs. Lorenz Larkin UFC 195 2016.01.02
Masanori Kanehara vs. Michael McDonald UFC 195 2016.01.02
Joe Soto vs. Michinori Tanaka UFC 195 2016.01.02
Henry Cejudo vs. Jussier Formiga UFC Fight Night 78 2015.11.21
Bartosz Fabiński vs. Hector Urbina UFC Fight Night 78 2015.11.21
Cesar Arzamendia vs. Polo Reyes UFC Fight Night 78 2015.11.21
Horacio Gutiérrez vs. Enrique Barzola UFC Fight Night 78 2015.11.21
Vitor Belfort vs. Dan Henderson III UFC Fight Night 77 2015.11.07
Piotr Hallmann vs. Alex Oliveira UFC Fight Night 77 2015.11.07
Pedro Munhoz vs. Jimmie Rivera UFC Fight Night 77 2015.11.07
Clay Guida vs. Thiago Tavares UFC Fight Night 77 2015.11.07
Andrew Flores Smith vs. Pedro Rizzo Face to Face 12 2015.09.12
Ray Borg vs. Geane Herrera UFC Fight Night 73 2015.08.08
Willie Gates vs. Dustin Ortiz UFC Fight Night 73 2015.08.08
Patrick Cummins vs. Rafael Cavalcante UFC 190 2015.08.01
Jessica Aguilar vs. Cláudia Gadelha UFC 190 2015.08.01
Maurício Rua vs. Antônio Rogério Nogueira II UFC 190 2015.08.01
Chico Camus vs. Henry Cejudo UFC 188 2015.06.13
Clay Collard vs. Gabriel Benitez UFC 188 2015.06.13
Yair Rodriguez vs. Charles Rosa UFC 188 2015.06.13
Thiago Alves vs. Carlos Condit UFC Fight Night 67 2015.05.30
Lucas Martins vs. Mirsad Bektic UFC Fight Night 67 2015.05.30
KJ Noons vs. Alex Oliveira UFC Fight Night 67 2015.05.30
Leonardo Mafra vs. Cain Carrizosa UFC Fight Night 62 2015.03.21
Shayna Baszler vs. Amanda Nunes UFC Fight Night 62 2015.03.21
Josh Koscheck vs. Erick Silva UFC Fight Night 62 2015.03.21
Frankie Saenz vs. Iuri Alcântara UFC Fight Night 61 2015.02.22
Frank Mir vs. Antônio Silva UFC Fight Night 61 2015.02.22
Josh Shockley vs. Ivan Jorge UFC Fight Night 61 2015.02.22
Cezar Ferreira vs. Sam Alvey UFC Fight Night 61 2015.02.22
Renan Barão vs. Mitch Gagnon UFC Fight Night 58 2014.12.20
Mike Rhodes vs. Erick Silva UFC Fight Night 58 2014.12.20
Patrick Cummins vs. Antônio Carlos Júnior UFC Fight Night 58 2014.12.20
Matt Hobar vs. Sergio Pettis UFC 181 2014.12.06
Urijah Faber vs. Francisco Rivera Jr. UFC 181 2014.12.06
Brendan Schaub vs. Travis Browne UFC 181 2014.12.06
Matt Wiman vs. Isaac Vallie-Flagg UFC Fight Night 57 2014.11.22
Juan Manuel Puig vs. Doo Ho Choi UFC Fight Night 57 2014.11.22
Edson Barboza vs. Bobby Green UFC Fight Night 57 2014.11.22
Gabriel Benitez vs. Humberto Brown Morrison UFC 180 2014.11.15
Yair Rodriguez vs. Leonardo Morales UFC 180 2014.11.15
Ricardo Lamas vs. Dennis Bermudez UFC 180 2014.11.15
Rodolfo Rubio Perez vs. Diego Rivas UFC Fight Night 56 2014.11.08
Ovince St. Preux vs. Maurício Rua UFC Fight Night 56 2014.11.08
Tim Gorman vs. Thomas Almeida UFC Fight Night 56 2014.11.08
Claudio Silva vs. Leon Edwards UFC Fight Night 56 2014.11.08
Phil Davis vs. Glover Teixeira UFC 179 2014.10.25
Yan Cabral vs. Naoyuki Kotani UFC 179 2014.10.25
Fabrício Camões vs. Tony Martin UFC 179 2014.10.25
Beneil Dariush vs. Carlos Diego Ferreira UFC 179 2014.10.25
Thiago Silva vs. Luiz André Siqueira The Hill Fighters 4 2014.09.28
Christiano Frohlich vs. Julio Cesar Araujo The Hill Fighters 4 2014.09.28
Gleison Tibau vs. Piotr Hallmann UFC Fight Night 51 2014.09.13
Dashon Johnson vs. Godofredo Pepey UFC Fight Night 51 2014.09.13
Santiago Ponzinibbio vs. Wendell Oliveira UFC Fight Night 51 2014.09.13
Leandro Silva vs. Francisco Trinaldo UFC Fight Night 51 2014.09.13
Matt Mitrione vs. Derrick Lewis UFC Fight Night 50 2014.09.05
Justin Scoggins vs. John Moraga UFC Fight Night 50 2014.09.05
Chris Beal vs. Tateki Matsuda UFC Fight Night 50 2014.09.05
Tuerxun Jumabieke vs. Leandro Issa The Ultimate Fighter 19 Finale 2014.07.06
Matt Van Buren vs. Corey Anderson The Ultimate Fighter 19 Finale 2014.07.06
Justin Scoggins vs. Dustin Ortiz The Ultimate Fighter 19 Finale 2014.07.06
Bruno Santos vs. Chris Camozzi UFC 175 2014.07.05
Guilherme Vasconcelos vs. Luke Zachrich UFC 175 2014.07.05
Russell Doane vs. Marcus Brimage UFC 175 2014.07.05
Rustam Khabilov vs. Benson Henderson UFC Fight Night 42 2014.06.07
Yves Edwards vs. Piotr Hallmann UFC Fight Night 42 2014.06.07
Lance Benoist vs. Bobby Voelker UFC Fight Night 42 2014.06.07
John Moraga vs. John Dodson II UFC Fight Night 42 2014.06.07
Matt Hobar vs. Pedro Munhoz UFC Fight Night 2014.05.31
Robbie Peralta vs. Rony Jason UFC Fight Night 2014.05.31
Fábio Maldonado vs. Stipe Miocic UFC Fight Night 2014.05.31
Warlley Alves vs. Marcio Alexandre Jr. UFC Fight Night 2014.05.31
Yancy Medeiros vs. Jim Miller UFC 172 2014.04.26
Luke Rockhold vs. Tim Boetsch UFC 172 2014.04.26
Joseph Benavidez vs. Tim Elliott UFC 172 2014.04.26
C.B. Dollaway vs. Cezar Ferreira UFC Fight Night 38 2014.03.23
Thiago Santos vs. Ronny Markes UFC Fight Night 38 2014.03.23
Mairbek Taisumov vs. Michel Prazeres UFC Fight Night 38 2014.03.23
Francimar Barroso vs. Hans Stringer UFC Fight Night 38 2014.03.23
Stephen Thompson vs. Robert Whittaker UFC 170 2014.02.22
Patrick Cummins vs. Daniel Cormier UFC 170 2014.02.22
Ivan Jorge vs. Rodrigo Damm UFC Fight Night 36 2014.02.15
Gegard Mousasi vs. Lyoto Machida UFC Fight Night 36 2014.02.15
Andy Ogle vs. Charles Oliveira UFC Fight Night 36 2014.02.15
Maximo Blanco vs. Felipe Arantes UFC Fight Night 36 2014.02.15
Erick Silva vs. Takenori Sato UFC Fight Night 36 2014.02.15
Miesha Tate vs. Ronda Rousey II UFC 168 2013.12.28
Dustin Poirier vs. Diego Brandão UFC 168 2013.12.28
William Macário vs. Bobby Voelker UFC 168 2013.12.28
Jessica Rakoczy vs. Julianna Peña The Ultimate Fighter 18 Finale 2013.11.30
Maximo Blanco vs. Akira Corassani The Ultimate Fighter 18 Finale 2013.11.30
Johny Hendricks vs. Georges St. Pierre UFC 167 2013.11.16
Jason High vs. Anthony Lapsley UFC 167 2013.11.16
Evan Dunham vs. Donald Cerrone UFC 167 2013.11.16
Rory MacDonald vs. Robbie Lawler UFC 167 2013.11.16
Adriano Martins vs. Daron Cruickshank UFC Fight Night 32 2013.11.09
Ryan LaFlare vs. Santiago Ponzinibbio UFC Fight Night 32 2013.11.09
Daniel Sarafian vs. Cezar Ferreira UFC Fight Night 32 2013.11.09
Yoel Romero vs. Ronny Markes UFC Fight Night 31 2013.11.06
Dennis Bermudez vs. Steven Siler UFC Fight Night 31 2013.11.06
George Roop vs. Francisco Rivera Jr. UFC Fight Night 31 2013.11.06

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