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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
Tiago Miranda vs. Alan Gabriel MMA Brazil Tour 1 2018.11.03
Piankhi Zimmerman vs. Otacilio de Oliveira MMA Brazil Tour 1 2018.11.03
Dyulie Duarte vs. Isabella de Pádua MMA Brazil Tour 1 2018.11.03
Alex Andrade vs. Thiago Gaia MMA Brazil Tour 1 2018.11.03
Handesson Ferreira vs. Ray Cooper III II PFL 2018 #10 2018.10.20
Rex Harris vs. Louis Taylor PFL 2018 #10 2018.10.20
Abusupiyan Magomedov vs. Gasan Umalatov PFL 2018 #10 2018.10.20
Rick Story vs. Handesson Ferreira PFL 2018 #10 2018.10.20
Gasan Umalatov vs. John Howard PFL 2018 #3 2018.07.05
Rex Harris vs. Andre Lobato II PFL 2018 #3 2018.07.05
Magomed Magomedkerimov vs. Herman Terrado PFL 2018 #3 2018.07.05
Jake Shields vs. Ray Cooper III PFL 2018 #3 2018.07.05
Louis Taylor vs. Anderson Gonçalves 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
Alan Patrick vs. Damir Hadžović UFC Fight Night 125 2018.02.03
James Krause vs. Alex White UFC Fight Night 124 2018.01.14
Irene Aldana vs. Talita Bernardo UFC Fight Night 124 2018.01.14
Paige VanZant vs. Jessica-Rose Clark UFC Fight Night 124 2018.01.14
Steven Siler vs. Lance Palmer PFL 2017.11.02
Caio Alencar vs. Blagoy Ivanov PFL 2017.11.02
Daniel Gallemore vs. Mike Kyle PFL 2017.11.02
Timur Valiev vs. Josenaldo Silva PFL 2017.11.02
Jarred Brooks vs. Deiveson Figueiredo UFC Fight Night 119 2017.10.28
John Lineker vs. Marlon Vera UFC Fight Night 119 2017.10.28
Rob Font vs. Pedro Munhoz UFC Fight Night 119 2017.10.28
Romário Garcia vs. Bruno Malfacine Shooto Brasil 74 2017.08.27
Luciano Benicio vs. Geraldo de Freitas Shooto Brasil 74 2017.08.27
Jafel Filho vs. Luan Matheus Shooto Brasil 74 2017.08.27
Diego Huerto vs. Marlon Sandro Shooto Brasil 74 2017.08.27
Carla Esparza vs. Maryna Moroz 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
Michael Chiesa vs. Kevin Lee UFC Fight Night 112 2017.06.25
Matthew Lopez vs. Johnny Eduardo UFC 212 2017.06.03
Karolina Kowalkiewicz vs. Cláudia Gadelha UFC 212 2017.06.03
Viviane Pereira vs. Jamie Moyle UFC 212 2017.06.03
Aljamain Sterling vs. Augusto Mendes UFC on FOX 24 2017.04.15
Rashid Magomedov vs. Bobby Green UFC on FOX 24 2017.04.15
Robert Whittaker vs. Ronaldo Souza UFC on FOX 24 2017.04.15
Francisco Trinaldo vs. Kevin Lee 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
Aiemann Zahabi vs. Reginaldo Vieira UFC Fight Night 105 2017.02.19
Gina Mazany vs. Sara McMann UFC Fight Night 105 2017.02.19
Travis Browne vs. Derrick Lewis 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
Krzysztof Jotko vs. Thales Leites UFC Fight Night 100 2016.11.19
Yoel Romero vs. Chris Weidman UFC 205 2016.11.12
Katlyn Chookagian vs. Liz Carmouche UFC 205 2016.11.12
Marcin Held vs. Diego Sanchez UFC Fight Night 98 2016.11.05
Jason Novelli vs. Polo Reyes UFC Fight Night 98 2016.11.05
Erik Perez vs. Felipe Arantes UFC Fight Night 98 2016.11.05
Cleber Souza vs. Elias Silvério Hugs Combat 2 2016.10.08
Alan Patrick vs. Stevie Ray UFC Fight Night 95 2016.09.24
Lina Länsberg vs. Cristiane Justino UFC Fight Night 95 2016.09.24
Godofredo Pepey vs. Mike De La Torre UFC Fight Night 95 2016.09.24
Matt Brown vs. Demian Maia 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
Alex Oliveira vs. Donald Cerrone UFC Fight Night 83 2016.02.21
Chris Camozzi vs. Joe Riggs UFC Fight Night 83 2016.02.21
Michinori Tanaka vs. Joe Soto UFC 195 2016.01.02
Albert Tumenov vs. Lorenz Larkin UFC 195 2016.01.02
Michael McDonald vs. Masanori Kanehara UFC 195 2016.01.02
Hector Urbina vs. Bartosz Fabiński UFC Fight Night 78 2015.11.21
Polo Reyes vs. Cesar Arzamendia UFC Fight Night 78 2015.11.21
Jussier Formiga vs. Henry Cejudo UFC Fight Night 78 2015.11.21
Horacio Gutiérrez vs. Enrique Barzola UFC Fight Night 78 2015.11.21
Pedro Munhoz vs. Jimmie Rivera UFC Fight Night 77 2015.11.07
Vitor Belfort vs. Dan Henderson III UFC Fight Night 77 2015.11.07
Alex Oliveira vs. Piotr Hallmann 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
Willie Gates vs. Dustin Ortiz UFC Fight Night 73 2015.08.08
Ray Borg vs. Geane Herrera UFC Fight Night 73 2015.08.08
Rafael Cavalcante vs. Patrick Cummins UFC 190 2015.08.01
Maurício Rua vs. Antônio Rogério Nogueira II UFC 190 2015.08.01
Cláudia Gadelha vs. Jessica Aguilar UFC 190 2015.08.01
Charles Rosa vs. Yair Rodriguez UFC 188 2015.06.13
Henry Cejudo vs. Chico Camus 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
KJ Noons vs. Alex Oliveira UFC Fight Night 67 2015.05.30
Mirsad Bektic vs. Lucas Martins UFC Fight Night 67 2015.05.30
Josh Koscheck vs. Erick Silva UFC Fight Night 62 2015.03.21
Leonardo Mafra vs. Cain Carrizosa UFC Fight Night 62 2015.03.21
Shayna Baszler vs. Amanda Nunes UFC Fight Night 62 2015.03.21
Ivan Jorge vs. Josh Shockley UFC Fight Night 61 2015.02.22
Cezar Ferreira vs. Sam Alvey UFC Fight Night 61 2015.02.22
Frank Mir vs. Antônio Silva UFC Fight Night 61 2015.02.22
Frankie Saenz vs. Iuri Alcântara UFC Fight Night 61 2015.02.22
Mike Rhodes vs. Erick Silva UFC Fight Night 58 2014.12.20
Mitch Gagnon vs. Renan Barão UFC Fight Night 58 2014.12.20
Antônio Carlos Júnior vs. Patrick Cummins UFC Fight Night 58 2014.12.20
Matt Hobar vs. Sergio Pettis UFC 181 2014.12.06
Brendan Schaub vs. Travis Browne UFC 181 2014.12.06
Urijah Faber vs. Francisco Rivera Jr. UFC 181 2014.12.06
Edson Barboza vs. Bobby Green UFC Fight Night 57 2014.11.22
Matt Wiman vs. Isaac Vallie-Flagg UFC Fight Night 57 2014.11.22
Doo Ho Choi vs. Juan Manuel Puig UFC Fight Night 57 2014.11.22
Leonardo Morales vs. Yair Rodriguez UFC 180 2014.11.15
Gabriel Benítez vs. Humberto Brown Morrison UFC 180 2014.11.15
Dennis Bermudez vs. Ricardo Lamas UFC 180 2014.11.15
Maurício Rua vs. Ovince St. Preux UFC Fight Night 56 2014.11.08
Rodolfo Rubio Perez vs. Diego Rivas 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
Phil Davis vs. Glover Teixeira UFC 179 2014.10.25
Yan Cabral vs. Naoyuki Kotani UFC 179 2014.10.25
Diego Ferreira vs. Beneil Dariush UFC 179 2014.10.25
Anthony Rocco Martin vs. Fabrício Camões UFC 179 2014.10.25
Julio Cesar Araujo vs. Christiano Frohlich The Hill Fighters 4 2014.09.28
Thiago Silva vs. Luiz André Siqueira The Hill Fighters 4 2014.09.28
Godofredo Pepey vs. Dashon Johnson 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
Piotr Hallmann vs. Gleison Tibau UFC Fight Night 51 2014.09.13
Chris Beal vs. Tateki Matsuda UFC Fight Night 50 2014.09.05
Derrick Lewis vs. Matt Mitrione UFC Fight Night 50 2014.09.05
Justin Scoggins vs. John Moraga UFC Fight Night 50 2014.09.05
Justin Scoggins vs. Dustin Ortiz 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
Russell Doane vs. Marcus Brimage UFC 175 2014.07.05
Luke Zachrich vs. Guilherme Bomba UFC 175 2014.07.05
Bruno Santos vs. Chris Camozzi UFC 175 2014.07.05
Piotr Hallmann vs. Yves Edwards UFC Fight Night 42 2014.06.07
Lance Benoist vs. Bobby Voelker UFC Fight Night 42 2014.06.07
Rustam Khabilov vs. Benson Henderson UFC Fight Night 42 2014.06.07
John Moraga vs. John Dodson II UFC Fight Night 42 2014.06.07
Marcio Alexandre Jr. vs. Warlley Alves UFC Fight Night 2014.05.31
Matt Hobar vs. Pedro Munhoz UFC Fight Night 2014.05.31
Stipe Miocic vs. Fábio Maldonado UFC Fight Night 2014.05.31
Robbie Peralta vs. Rony Jason UFC Fight Night 2014.05.31
Joseph Benavidez vs. Tim Elliott UFC 172 2014.04.26
Yancy Medeiros vs. Jim Miller UFC 172 2014.04.26
Tim Boetsch vs. Luke Rockhold UFC 172 2014.04.26
Francimar Barroso vs. Hans Stringer 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
Michel Prazeres vs. Mairbek Taisumov UFC Fight Night 38 2014.03.23
Robert Whittaker vs. Stephen Thompson UFC 170 2014.02.22
Patrick Cummins vs. Daniel Cormier UFC 170 2014.02.22
Maximo Blanco vs. Felipe Arantes UFC Fight Night 36 2014.02.15
Rodrigo Damm vs. Ivan Jorge UFC Fight Night 36 2014.02.15
Lyoto Machida vs. Gegard Mousasi UFC Fight Night 36 2014.02.15
Charles Oliveira vs. Andy Ogle UFC Fight Night 36 2014.02.15
Takenori Sato vs. Erick Silva UFC Fight Night 36 2014.02.15

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