Mario Yamasaki

Mario Yamasaki (born April 22, 1964) is a Brazilian mixed martial arts referee licensed in many states, most recognizable from his duties with the Ultimate Fighting Championship (UFC), as well as founder and chief instructor of the International Yamasaki Academy. Yamasaki is a veteran of over 490 fights in the UFC, Strikeforce, WEC, EliteXC and Pride Fighting Championships.

Biography Yamasaki was born in São Paulo, Brazil, the oldest of two sons born to Shigeru Yamasaki (山崎 茂 ). Yamasaki's family has been teaching martial arts in Brazil for two generations. His father is half-Japanese.

Yamasaki and his younger brother Fernando, a 7th Red & Black Belt in BJJ, originally began training in judo as children under their father Shigeru, an 8th degree Red/White belt in the art ).

In 1986, at the age of 22 Yamasaki began training in Brazilian jiu-jitsu under 5th degree black belt Marcelo Behring (a black belt under his father Flavio Behring and Rickson Gracie

At UFC 142 Yamasaki controversially disqualified Erick Silva for illegal blows to the head of Carlo Prater. After the bout, in-ring announcer Joe Rogan criticized Yamasaki for making a bad decision. The UFC upheld his decision and did not seek appeal.

At UFC Fight Night: Machida vs. Anders, Yamasaki was criticized by observers, including Dana White, after he failed to stop a fight between Valentina Shevchenko and Priscila Cachoeira: Shevchenko landed over two hundred strikes to Cachoeira's three. Yamasaki later said that he let the fight go on because he wanted to "allow [Cachoeira] to be a warrior and keep fighting". Dana White has previously repeatedly called for Yamasaki to be precluded from refereeing future UFC events, due to numerous similar controversies. Since the event, Yamasaki has not applied for any UFC refereeing jobs although he has refereed a few other smaller organizations' events.

He announced in 2021 that he planned on applying for more regular officiating assignments, as well as taking a judging course organized by the California State Athletic Commission.

Personal life Yamasaki lives between São Paulo, Brazil, and Bethesda, Maryland, with his wife and children, where he co-owns and operates a chain of Brazilian jiu-jitsu schools. Yamasaki comes from a martial arts family. Both his father Shigueru Yamasaki and uncle Shigueto Yamasaki are high ranking judoka in Brazil. His brother Fernando Yamasaki holds black belt ranks in both Brazilian jiu-jitsu and judo. His cousin Shigueto Yamasaki, Jr. represented Brazil competing in judo at the 1992 Summer Olympics.