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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
Abusupiyan Magomedov vs. Gasan Umalatov PFL 2018 #10 2018.10.20
Handesson Ferreira vs. Rick Story PFL 2018 #10 2018.10.20
Handesson Ferreira vs. Ray Cooper III II PFL 2018 #10 2018.10.20
Louis Taylor vs. Rex Harris PFL 2018 #10 2018.10.20
Ray Cooper III vs. Jake Shields PFL 2018 #3 2018.07.05
Yuri Villefort vs. Rick Story PFL 2018 #3 2018.07.05
Anderson Gonçalves vs. Louis Taylor PFL 2018 #3 2018.07.05
Andre Lobato vs. Rex Harris II PFL 2018 #3 2018.07.05
Gasan Umalatov vs. John Howard PFL 2018 #3 2018.07.05
Magomed Magomedkerimov vs. Herman Terrado 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
Alex White vs. James Krause UFC Fight Night 124 2018.01.14
Talita Bernardo vs. Irene Aldana UFC Fight Night 124 2018.01.14
Jessica-Rose Clark vs. Paige VanZant UFC Fight Night 124 2018.01.14
Blagoy Ivanov vs. Caio Alencar PFL 2017.11.02
Steven Siler vs. Lance Palmer PFL 2017.11.02
Daniel Gallemore vs. Mike Kyle PFL 2017.11.02
Josenaldo Silva vs. Timur Valiev PFL 2017.11.02
Deiveson Figueiredo vs. Jarred Brooks UFC Fight Night 119 2017.10.28
Pedro Munhoz vs. Rob Font UFC Fight Night 119 2017.10.28
John Lineker vs. Marlon Vera UFC Fight Night 119 2017.10.28
Bruno Malfacine vs. Romario Boaes Shooto Brasil 74 2017.08.27
Marlon Sandro vs. Diego Huerto Shooto Brasil 74 2017.08.27
Geraldo de Freitas vs. Luciano Benicio Shooto Brasil 74 2017.08.27
Luan Matheus vs. Jafel Filho Shooto Brasil 74 2017.08.27
Maryna Moroz vs. Carla Esparza UFC Fight Night 112 2017.06.25
Jeremy Kimball vs. Josh Stansbury UFC Fight Night 112 2017.06.25
Tim Means vs. Alex Garcia UFC Fight Night 112 2017.06.25
Kevin Lee vs. Mike Chiesa UFC Fight Night 112 2017.06.25
Matthew Lopez vs. Johnny Eduardo UFC 212 2017.06.03
Jamie Moyle vs. Viviane Pereira 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
Ronaldo Souza vs. Robert Whittaker 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
Reginaldo Vieira vs. Aiemann Zahabi UFC Fight Night 105 2017.02.19
Derrick Lewis vs. Travis Browne UFC Fight Night 105 2017.02.19
Gina Mazany vs. Sara McMann 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
Yoel Romero vs. Chris Weidman UFC 205 2016.11.12
Katlyn Chookagian vs. Liz Carmouche UFC 205 2016.11.12
Polo Reyes vs. Jason Novelli UFC Fight Night 98 2016.11.05
Marcin Held vs. Diego Sanchez UFC Fight Night 98 2016.11.05
Felipe Arantes vs. Erik Perez UFC Fight Night 98 2016.11.05
Cristiane Justino vs. Lina Länsberg UFC Fight Night 95 2016.09.24
Godofredo Pepey vs. Mike De La Torre UFC Fight Night 95 2016.09.24
Alan Patrick vs. Stevie Ray 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
Cody Garbrandt vs. Augusto Mendes UFC Fight Night 83 2016.02.21
Alex Oliveira vs. Donald Cerrone UFC Fight Night 83 2016.02.21
Joe Riggs vs. Chris Camozzi 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
Hector Urbina vs. Bartosz Fabiński 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
Dan Henderson vs. Vitor Belfort III UFC Fight Night 77 2015.11.07
Clay Guida vs. Thiago Tavares UFC Fight Night 77 2015.11.07
Alex Oliveira vs. Piotr Hallmann 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
Ray Borg vs. Geane Herrera 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
Chico Camus vs. Henry Cejudo UFC 188 2015.06.13
Clay Collard vs. Gabriel Benítez 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
Leonardo Mafra vs. Cain Carrizosa UFC Fight Night 62 2015.03.21
Ivan Jorge vs. Josh Shockley UFC Fight Night 61 2015.02.22
Sam Alvey vs. Cezar Ferreira 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
Renan Barão vs. Mitch Gagnon UFC Fight Night 58 2014.12.20
Antônio Carlos Júnior vs. Patrick Cummins UFC Fight Night 58 2014.12.20
Mike Rhodes vs. Erick Silva UFC Fight Night 58 2014.12.20
Sergio Pettis vs. Matt Hobar UFC 181 2014.12.06
Brendan Schaub vs. Travis Browne 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
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
Humberto Brown Morrison vs. Gabriel Benítez UFC 180 2014.11.15
Ricardo Lamas vs. Dennis Bermudez UFC 180 2014.11.15
Yair Rodriguez vs. Leonardo Morales UFC 180 2014.11.15
Claudio Silva vs. Leon Edwards UFC Fight Night 56 2014.11.08
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
Tony Martin vs. Fabrício Camões UFC 179 2014.10.25
Glover Teixeira vs. Phil Davis 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
Julio Cesar Araujo vs. Christiano Frohlich The Hill Fighters 4 2014.09.28
Luiz André Siqueira vs. Thiago Silva The Hill Fighters 4 2014.09.28
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
Dashon Johnson vs. Godofredo Pepey UFC Fight Night 51 2014.09.13
Chris Beal vs. Tateki Matsuda UFC Fight Night 50 2014.09.05
John Moraga vs. Justin Scoggins 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
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
Marcus Brimage vs. Russell Doane UFC 175 2014.07.05
Guilherme Vasconcelos vs. Luke Zachrich UFC 175 2014.07.05
Bruno Santos vs. Chris Camozzi UFC 175 2014.07.05
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
Lance Benoist vs. Bobby Voelker UFC Fight Night 42 2014.06.07
Piotr Hallmann vs. Yves Edwards UFC Fight Night 42 2014.06.07
Stipe Miocic vs. Fábio Maldonado UFC Fight Night 2014.05.31
Rony Jason vs. Robbie Peralta UFC Fight Night 2014.05.31
Marcio Alexandre Jr. vs. Warlley Alves UFC Fight Night 2014.05.31
Pedro Munhoz vs. Matt Hobar UFC Fight Night 2014.05.31
Joseph Benavidez vs. Tim Elliott UFC 172 2014.04.26
Luke Rockhold vs. Tim Boetsch UFC 172 2014.04.26
Yancy Medeiros vs. Jim Miller UFC 172 2014.04.26
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
C.B. Dollaway vs. Cezar Ferreira 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
Ivan Jorge vs. Rodrigo Damm UFC Fight Night 36 2014.02.15
Lyoto Machida vs. Gegard Mousasi UFC Fight Night 36 2014.02.15
Felipe Arantes vs. Maximo Blanco UFC Fight Night 36 2014.02.15
Erick Silva vs. Takenori Sato UFC Fight Night 36 2014.02.15
Andy Ogle vs. Charles Oliveira UFC Fight Night 36 2014.02.15
Diego Brandão vs. Dustin Poirier UFC 168 2013.12.28
Ronda Rousey vs. Miesha Tate II UFC 168 2013.12.28
Bobby Voelker vs. William Macário UFC 168 2013.12.28
Maximo Blanco vs. Akira Corassani The Ultimate Fighter 18 Finale 2013.11.30
Julianna Peña vs. Jessica Rakoczy The Ultimate Fighter 18 Finale 2013.11.30

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