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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
Ray Cooper III vs. Jake Shields PFL 2018 #3 2018.07.05
John Howard vs. Gasan Umalatov PFL 2018 #3 2018.07.05
Rex Harris vs. Andre Lobato II PFL 2018 #3 2018.07.05
Herman Terrado vs. Magomed Magomedkerimov PFL 2018 #3 2018.07.05
Anderson Gonçalves vs. Louis Taylor PFL 2018 #3 2018.07.05
Yuri Villefort vs. Rick Story PFL 2018 #3 2018.07.05
Priscila Cachoeira vs. Valentina Shevchenko UFC Fight Night 125 2018.02.03
Damir Hadžović vs. Alan Patrick UFC Fight Night 125 2018.02.03
James Krause vs. Alex White UFC Fight Night 124 2018.01.14
Talita Bernardo vs. Irene Aldana UFC Fight Night 124 2018.01.14
Paige VanZant vs. Jessica-Rose Clark UFC Fight Night 124 2018.01.14
Blagoy Ivanov vs. Caio Alencar PFL 2017.11.02
Timur Valiev vs. Josenaldo Silva PFL 2017.11.02
Daniel Gallemore vs. Mike Kyle PFL 2017.11.02
Steven Siler vs. Lance Palmer PFL 2017.11.02
Deiveson Figueiredo vs. Jarred Brooks UFC Fight Night 119 2017.10.28
Marlon Vera vs. John Lineker UFC Fight Night 119 2017.10.28
Rob Font vs. Pedro Munhoz UFC Fight Night 119 2017.10.28
Romario Boaes vs. Bruno Malfacine Shooto Brasil 74 2017.08.27
Marlon Sandro vs. Diego Huerto Shooto Brasil 74 2017.08.27
Jafel Filho vs. Luan Matheus Shooto Brasil 74 2017.08.27
Geraldo de Freitas vs. Luciano Benicio Shooto Brasil 74 2017.08.27
Tim Means vs. Alex Garcia UFC Fight Night 112 2017.06.25
Jeremy Kimball vs. Josh Stansbury UFC Fight Night 112 2017.06.25
Maryna Moroz vs. Carla Esparza UFC Fight Night 112 2017.06.25
Kevin Lee vs. Mike Chiesa UFC Fight Night 112 2017.06.25
Johnny Eduardo vs. Matthew Lopez UFC 212 2017.06.03
Viviane Pereira vs. Jamie Moyle UFC 212 2017.06.03
Karolina Kowalkiewicz vs. Cláudia Gadelha UFC 212 2017.06.03
Rashid Magomedov vs. Bobby Green UFC on FOX 24 2017.04.15
Robert Whittaker vs. Ronaldo Souza UFC on FOX 24 2017.04.15
Augusto Mendes vs. Aljamain Sterling UFC on FOX 24 2017.04.15
Kevin Lee vs. Francisco Trinaldo UFC Fight Night 106 2017.03.11
Gian Villante vs. Maurício Rua UFC Fight Night 106 2017.03.11
Ray Borg vs. Jussier Formiga UFC Fight Night 106 2017.03.11
Gina Mazany vs. Sara McMann UFC Fight Night 105 2017.02.19
Aiemann Zahabi vs. Reginaldo Vieira UFC Fight Night 105 2017.02.19
Derrick Lewis vs. Travis Browne UFC Fight Night 105 2017.02.19
Ryan Bader vs. Antônio Rogério Nogueira II UFC Fight Night 100 2016.11.19
Johnny Eduardo vs. Manny Gamburyan UFC Fight Night 100 2016.11.19
Thales Leites vs. Krzysztof Jotko UFC Fight Night 100 2016.11.19
Yoel Romero vs. Chris Weidman UFC 205 2016.11.12
Liz Carmouche vs. Katlyn Chookagian UFC 205 2016.11.12
Polo Reyes vs. Jason Novelli UFC Fight Night 98 2016.11.05
Felipe Arantes vs. Erik Perez UFC Fight Night 98 2016.11.05
Marcin Held vs. Diego Sanchez UFC Fight Night 98 2016.11.05
Stevie Ray vs. Alan Patrick UFC Fight Night 95 2016.09.24
Lina Länsberg vs. Cristiane Justino UFC Fight Night 95 2016.09.24
Mike De La Torre vs. Godofredo Pepey UFC Fight Night 95 2016.09.24
Corey Anderson vs. Maurício Rua UFC 198 2016.05.14
Matt Brown vs. Demian Maia UFC 198 2016.05.14
Augusto Mendes vs. Cody Garbrandt UFC Fight Night 83 2016.02.21
Alex Oliveira vs. Donald Cerrone UFC Fight Night 83 2016.02.21
Chris Camozzi vs. Joe Riggs UFC Fight Night 83 2016.02.21
Masanori Kanehara vs. Michael McDonald UFC 195 2016.01.02
Michinori Tanaka vs. Joe Soto UFC 195 2016.01.02
Albert Tumenov vs. Lorenz Larkin UFC 195 2016.01.02
Bartosz Fabiński vs. Hector Urbina UFC Fight Night 78 2015.11.21
Horacio Gutiérrez vs. Enrique Barzola UFC Fight Night 78 2015.11.21
Jussier Formiga vs. Henry Cejudo UFC Fight Night 78 2015.11.21
Cesar Arzamendia vs. Polo Reyes UFC Fight Night 78 2015.11.21
Vitor Belfort vs. Dan Henderson III UFC Fight Night 77 2015.11.07
Clay Guida vs. Thiago Tavares 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
Andrew Flores Smith vs. Pedro Rizzo Face to Face 12 2015.09.12
Geane Herrera vs. Ray Borg UFC Fight Night 73 2015.08.08
Willie Gates vs. Dustin Ortiz UFC Fight Night 73 2015.08.08
Antônio Rogério Nogueira vs. Maurício Rua II UFC 190 2015.08.01
Rafael Cavalcante vs. Patrick Cummins UFC 190 2015.08.01
Jessica Aguilar vs. Cláudia Gadelha UFC 190 2015.08.01
Gabriel Benítez vs. Clay Collard UFC 188 2015.06.13
Chico Camus vs. Henry Cejudo 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
Erick Silva vs. Josh Koscheck UFC Fight Night 62 2015.03.21
Shayna Baszler vs. Amanda Nunes UFC Fight Night 62 2015.03.21
Cain Carrizosa vs. Leonardo Mafra UFC Fight Night 62 2015.03.21
Sam Alvey vs. Cezar Ferreira UFC Fight Night 61 2015.02.22
Ivan Jorge vs. Josh Shockley UFC Fight Night 61 2015.02.22
Frankie Saenz vs. Iuri Alcântara UFC Fight Night 61 2015.02.22
Frank Mir vs. Antônio Silva UFC Fight Night 61 2015.02.22
Mike Rhodes vs. Erick Silva UFC Fight Night 58 2014.12.20
Antônio Carlos Júnior vs. Patrick Cummins UFC Fight Night 58 2014.12.20
Mitch Gagnon vs. Renan Barão UFC Fight Night 58 2014.12.20
Brendan Schaub vs. Travis Browne UFC 181 2014.12.06
Sergio Pettis vs. Matt Hobar UFC 181 2014.12.06
Francisco Rivera Jr. vs. Urijah Faber UFC 181 2014.12.06
Juan Manuel Puig vs. Doo Ho Choi UFC Fight Night 57 2014.11.22
Bobby Green vs. Edson Barboza UFC Fight Night 57 2014.11.22
Isaac Vallie-Flagg vs. Matt Wiman UFC Fight Night 57 2014.11.22
Humberto Brown Morrison vs. Gabriel Benítez UFC 180 2014.11.15
Ricardo Lamas vs. Dennis Bermudez UFC 180 2014.11.15
Leonardo Morales vs. Yair Rodriguez UFC 180 2014.11.15
Claudio Silva vs. Leon Edwards UFC Fight Night 56 2014.11.08
Maurício Rua vs. Ovince St. Preux UFC Fight Night 56 2014.11.08
Diego Rivas vs. Rodolfo Rubio Perez UFC Fight Night 56 2014.11.08
Tim Gorman vs. Thomas Almeida UFC Fight Night 56 2014.11.08
Fabrício Camões vs. Tony Martin UFC 179 2014.10.25
Phil Davis vs. Glover Teixeira UFC 179 2014.10.25
Carlos Diego Ferreira vs. Beneil Dariush UFC 179 2014.10.25
Naoyuki Kotani vs. Yan Cabral UFC 179 2014.10.25
Luiz André Siqueira vs. Thiago Silva The Hill Fighters 4 2014.09.28
Christiano Frohlich vs. Julio Cesar Araujo The Hill Fighters 4 2014.09.28
Dashon Johnson vs. Godofredo Pepey UFC Fight Night 51 2014.09.13
Santiago Ponzinibbio vs. Wendell Oliveira UFC Fight Night 51 2014.09.13
Francisco Trinaldo vs. Leandro Silva UFC Fight Night 51 2014.09.13
Gleison Tibau vs. Piotr Hallmann UFC Fight Night 51 2014.09.13
Tateki Matsuda vs. Chris Beal UFC Fight Night 50 2014.09.05
Justin Scoggins vs. John Moraga UFC Fight Night 50 2014.09.05
Derrick Lewis vs. Matt Mitrione UFC Fight Night 50 2014.09.05
Tuerxun Jumabieke vs. Leandro Issa The Ultimate Fighter 19 Finale 2014.07.06
Corey Anderson vs. Matt Van Buren The Ultimate Fighter 19 Finale 2014.07.06
Justin Scoggins vs. Dustin Ortiz The Ultimate Fighter 19 Finale 2014.07.06
Luke Zachrich vs. Guilherme Vasconcelos UFC 175 2014.07.05
Marcus Brimage vs. Russell Doane UFC 175 2014.07.05
Bruno Santos vs. Chris Camozzi UFC 175 2014.07.05
John Moraga vs. John Dodson II UFC Fight Night 42 2014.06.07
Benson Henderson vs. Rustam Khabilov UFC Fight Night 42 2014.06.07
Bobby Voelker vs. Lance Benoist UFC Fight Night 42 2014.06.07
Piotr Hallmann vs. Yves Edwards UFC Fight Night 42 2014.06.07
Robbie Peralta vs. Rony Jason UFC Fight Night 2014.05.31
Stipe Miocic vs. Fábio Maldonado UFC Fight Night 2014.05.31
Pedro Munhoz vs. Matt Hobar UFC Fight Night 2014.05.31
Marcio Alexandre Jr. vs. Warlley Alves UFC Fight Night 2014.05.31
Tim Boetsch vs. Luke Rockhold UFC 172 2014.04.26
Tim Elliott vs. Joseph Benavidez UFC 172 2014.04.26
Yancy Medeiros vs. Jim Miller UFC 172 2014.04.26
Cezar Ferreira vs. C.B. Dollaway UFC Fight Night 38 2014.03.23
Hans Stringer vs. Francimar Barroso UFC Fight Night 38 2014.03.23
Mairbek Taisumov vs. Michel Prazeres UFC Fight Night 38 2014.03.23
Thiago Santos vs. Ronny Markes UFC Fight Night 38 2014.03.23
Stephen Thompson vs. Robert Whittaker UFC 170 2014.02.22
Daniel Cormier vs. Patrick Cummins UFC 170 2014.02.22
Erick Silva vs. Takenori Sato UFC Fight Night 36 2014.02.15
Maximo Blanco vs. Felipe Arantes UFC Fight Night 36 2014.02.15
Rodrigo Damm vs. Ivan Jorge UFC Fight Night 36 2014.02.15
Charles Oliveira vs. Andy Ogle UFC Fight Night 36 2014.02.15
Gegard Mousasi vs. Lyoto Machida UFC Fight Night 36 2014.02.15
Bobby Voelker vs. William Macário UFC 168 2013.12.28
Dustin Poirier vs. Diego Brandão UFC 168 2013.12.28
Ronda Rousey vs. Miesha Tate II UFC 168 2013.12.28
Akira Corassani vs. Maximo Blanco The Ultimate Fighter 18 Finale 2013.11.30
Jessica Rakoczy vs. Julianna Peña The Ultimate Fighter 18 Finale 2013.11.30
Georges St. Pierre vs. Johny Hendricks UFC 167 2013.11.16
Evan Dunham vs. Donald Cerrone UFC 167 2013.11.16
Robbie Lawler vs. Rory MacDonald UFC 167 2013.11.16
Jason High vs. Anthony Lapsley UFC 167 2013.11.16

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