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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
Piankhi Zimmerman vs. Otacilio Cena MMA Brazil Tour 1 2018.11.03
Tiago Miranda vs. Alan Gabriel MMA Brazil Tour 1 2018.11.03
Isabella de Pádua vs. Dyulie Duarte MMA Brazil Tour 1 2018.11.03
Thiago Gaia vs. Alex Andrade MMA Brazil Tour 1 2018.11.03
Abusupiyan Magomedov vs. Gasan Umalatov PFL 2018 #10 2018.10.20
Handesson Ferreira vs. Ray Cooper III II PFL 2018 #10 2018.10.20
Handesson Ferreira vs. Rick Story PFL 2018 #10 2018.10.20
Louis Taylor vs. Rex Harris PFL 2018 #10 2018.10.20
Jake Shields vs. Ray Cooper III PFL 2018 #3 2018.07.05
Rex Harris vs. Andre Lobato II PFL 2018 #3 2018.07.05
Louis Taylor vs. Anderson Gonçalves PFL 2018 #3 2018.07.05
Herman Terrado vs. Magomed Magomedkerimov PFL 2018 #3 2018.07.05
John Howard vs. Gasan Umalatov PFL 2018 #3 2018.07.05
Rick Story vs. Yuri Villefort PFL 2018 #3 2018.07.05
Valentina Shevchenko vs. Priscila Cachoeira UFC Fight Night 125 2018.02.03
Damir Hadžović vs. Alan Patrick UFC Fight Night 125 2018.02.03
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
James Krause vs. Alex White UFC Fight Night 124 2018.01.14
Timur Valiev vs. Josenaldo Silva PFL 2017.11.02
Mike Kyle vs. Daniel Gallemore PFL 2017.11.02
Steven Siler vs. Lance Palmer PFL 2017.11.02
Caio Alencar vs. Blagoy Ivanov PFL 2017.11.02
Marlon Vera vs. John Lineker UFC Fight Night 119 2017.10.28
Rob Font vs. Pedro Munhoz UFC Fight Night 119 2017.10.28
Jarred Brooks vs. Deiveson Figueiredo UFC Fight Night 119 2017.10.28
Jafel Filho vs. Luan Matheus Shooto Brasil 74 2017.08.27
Romario Boaes vs. Bruno Malfacine Shooto Brasil 74 2017.08.27
Diego Huerto vs. Marlon Sandro Shooto Brasil 74 2017.08.27
Luciano Benicio vs. Geraldo de Freitas Shooto Brasil 74 2017.08.27
Mike Chiesa vs. Kevin Lee UFC Fight Night 112 2017.06.25
Tim Means vs. Alex Garcia UFC Fight Night 112 2017.06.25
Jeremy Kimball vs. Josh Stansbury UFC Fight Night 112 2017.06.25
Carla Esparza vs. Maryna Moroz 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
Cláudia Gadelha vs. Karolina Kowalkiewicz UFC 212 2017.06.03
Rashid Magomedov vs. Bobby Green UFC on FOX 24 2017.04.15
Augusto Mendes vs. Aljamain Sterling UFC on FOX 24 2017.04.15
Ronaldo Souza vs. Robert Whittaker UFC on FOX 24 2017.04.15
Kevin Lee vs. Francisco Trinaldo UFC Fight Night 106 2017.03.11
Jussier Formiga vs. Ray Borg UFC Fight Night 106 2017.03.11
Maurício Rua vs. Gian Villante UFC Fight Night 106 2017.03.11
Aiemann Zahabi vs. Reginaldo Vieira UFC Fight Night 105 2017.02.19
Sara McMann vs. Gina Mazany UFC Fight Night 105 2017.02.19
Travis Browne vs. Derrick Lewis UFC Fight Night 105 2017.02.19
Krzysztof Jotko vs. Thales Leites UFC Fight Night 100 2016.11.19
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
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
Polo Reyes vs. Jason Novelli UFC Fight Night 98 2016.11.05
Felipe Arantes vs. Erik Perez UFC Fight Night 98 2016.11.05
Stevie Ray vs. Alan Patrick UFC Fight Night 95 2016.09.24
Mike De La Torre vs. Godofredo Pepey UFC Fight Night 95 2016.09.24
Cristiane Justino vs. Lina Länsberg UFC Fight Night 95 2016.09.24
Demian Maia vs. Matt Brown UFC 198 2016.05.14
Corey Anderson vs. Maurício Rua UFC 198 2016.05.14
Cody Garbrandt vs. Augusto Mendes UFC Fight Night 83 2016.02.21
Donald Cerrone vs. Alex Oliveira UFC Fight Night 83 2016.02.21
Joe Riggs vs. Chris Camozzi UFC Fight Night 83 2016.02.21
Michael McDonald vs. Masanori Kanehara UFC 195 2016.01.02
Joe Soto vs. Michinori Tanaka UFC 195 2016.01.02
Lorenz Larkin vs. Albert Tumenov UFC 195 2016.01.02
Jussier Formiga vs. Henry Cejudo UFC Fight Night 78 2015.11.21
Enrique Barzola vs. Horacio Gutiérrez UFC Fight Night 78 2015.11.21
Cesar Arzamendia vs. Polo Reyes UFC Fight Night 78 2015.11.21
Hector Urbina vs. Bartosz Fabiński UFC Fight Night 78 2015.11.21
Jimmie Rivera vs. Pedro Munhoz 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
Vitor Belfort vs. Dan Henderson III UFC Fight Night 77 2015.11.07
Pedro Rizzo vs. Andrew Flores Smith Face to Face 12 2015.09.12
Willie Gates vs. Dustin Ortiz UFC Fight Night 73 2015.08.08
Ray Borg vs. Geane Herrera 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
Henry Cejudo vs. Chico Camus UFC 188 2015.06.13
Charles Rosa vs. Yair Rodriguez UFC 188 2015.06.13
Gabriel Benítez vs. Clay Collard UFC 188 2015.06.13
Carlos Condit vs. Thiago Alves UFC Fight Night 67 2015.05.30
Alex Oliveira vs. KJ Noons UFC Fight Night 67 2015.05.30
Mirsad Bektic vs. Lucas Martins UFC Fight Night 67 2015.05.30
Cain Carrizosa vs. Leonardo Mafra UFC Fight Night 62 2015.03.21
Josh Koscheck vs. Erick Silva UFC Fight Night 62 2015.03.21
Amanda Nunes vs. Shayna Baszler UFC Fight Night 62 2015.03.21
Cezar Ferreira vs. Sam Alvey UFC Fight Night 61 2015.02.22
Antônio Silva vs. Frank Mir UFC Fight Night 61 2015.02.22
Iuri Alcântara vs. Frankie Saenz UFC Fight Night 61 2015.02.22
Ivan Jorge vs. Josh Shockley UFC Fight Night 61 2015.02.22
Erick Silva vs. Mike Rhodes UFC Fight Night 58 2014.12.20
Antônio Carlos Júnior vs. Patrick Cummins UFC Fight Night 58 2014.12.20
Renan Barão vs. Mitch Gagnon UFC Fight Night 58 2014.12.20
Sergio Pettis vs. Matt Hobar UFC 181 2014.12.06
Francisco Rivera Jr. vs. Urijah Faber UFC 181 2014.12.06
Travis Browne vs. Brendan Schaub UFC 181 2014.12.06
Matt Wiman vs. Isaac Vallie-Flagg UFC Fight Night 57 2014.11.22
Bobby Green vs. Edson Barboza UFC Fight Night 57 2014.11.22
Juan Manuel Puig vs. Doo Ho Choi UFC Fight Night 57 2014.11.22
Humberto Brown Morrison vs. Gabriel Benítez UFC 180 2014.11.15
Dennis Bermudez vs. Ricardo Lamas UFC 180 2014.11.15
Leonardo Morales vs. Yair Rodriguez UFC 180 2014.11.15
Diego Rivas vs. Rodolfo Rubio Perez UFC Fight Night 56 2014.11.08
Maurício Rua vs. Ovince St. Preux UFC Fight Night 56 2014.11.08
Leon Edwards vs. Claudio Silva UFC Fight Night 56 2014.11.08
Tim Gorman vs. Thomas Almeida UFC Fight Night 56 2014.11.08
Anthony Rocco Martin vs. Fabrício Camões UFC 179 2014.10.25
Beneil Dariush vs. Diego Ferreira UFC 179 2014.10.25
Yan Cabral vs. Naoyuki Kotani UFC 179 2014.10.25
Phil Davis vs. Glover Teixeira 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
Francisco Trinaldo vs. Leandro Silva UFC Fight Night 51 2014.09.13
Santiago Ponzinibbio vs. Wendell Oliveira UFC Fight Night 51 2014.09.13
Godofredo Pepey vs. Dashon Johnson UFC Fight Night 51 2014.09.13
Gleison Tibau vs. Piotr Hallmann UFC Fight Night 51 2014.09.13
Derrick Lewis vs. Matt Mitrione UFC Fight Night 50 2014.09.05
Chris Beal vs. Tateki Matsuda UFC Fight Night 50 2014.09.05
John Moraga vs. Justin Scoggins UFC Fight Night 50 2014.09.05
Dustin Ortiz vs. Justin Scoggins The Ultimate Fighter 19 Finale 2014.07.06
Matt Van Buren vs. Corey Anderson The Ultimate Fighter 19 Finale 2014.07.06
Leandro Issa vs. Tuerxun Jumabieke The Ultimate Fighter 19 Finale 2014.07.06
Chris Camozzi vs. Bruno Santos UFC 175 2014.07.05
Russell Doane vs. Marcus Brimage UFC 175 2014.07.05
Luke Zachrich vs. Guilherme Bomba UFC 175 2014.07.05
Lance Benoist vs. Bobby Voelker UFC Fight Night 42 2014.06.07
Benson Henderson vs. Rustam Khabilov UFC Fight Night 42 2014.06.07
Piotr Hallmann vs. Yves Edwards UFC Fight Night 42 2014.06.07
John Dodson vs. John Moraga II UFC Fight Night 42 2014.06.07
Matt Hobar vs. Pedro Munhoz UFC Fight Night 2014.05.31
Rony Jason vs. Robbie Peralta UFC Fight Night 2014.05.31
Stipe Miocic vs. Fábio Maldonado UFC Fight Night 2014.05.31
Marcio Alexandre Jr. vs. Warlley Alves UFC Fight Night 2014.05.31
Jim Miller vs. Yancy Medeiros UFC 172 2014.04.26
Tim Boetsch vs. Luke Rockhold UFC 172 2014.04.26
Joseph Benavidez vs. Tim Elliott UFC 172 2014.04.26
Mairbek Taisumov vs. Michel Prazeres UFC Fight Night 38 2014.03.23
Ronny Markes vs. Thiago Santos UFC Fight Night 38 2014.03.23
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
Patrick Cummins vs. Daniel Cormier UFC 170 2014.02.22
Robert Whittaker vs. Stephen Thompson UFC 170 2014.02.22
Felipe Arantes vs. Maximo Blanco UFC Fight Night 36 2014.02.15
Rodrigo Damm vs. Ivan Jorge UFC Fight Night 36 2014.02.15
Takenori Sato vs. Erick Silva UFC Fight Night 36 2014.02.15
Lyoto Machida vs. Gegard Mousasi UFC Fight Night 36 2014.02.15
Andy Ogle vs. Charles Oliveira UFC Fight Night 36 2014.02.15
Ronda Rousey vs. Miesha Tate II UFC 168 2013.12.28

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