Mario Yamasaki

UFC referee · active in the loaded archive 1999–2018. 392 archived assignments, 18 title fights.

392Archived assignments

18Title fights

33Five-round

57.7%Stoppage rate

41.3%Decision rate

9:25Avg fight time

What to know

Near the archive baseline

Mario Yamasaki's 57.7% stoppage rate sits close to the 53% archive baseline. The referee sample does not create a strong finish-versus-decision signal on its own.

57.7% of loaded assignments ended by stoppage (132 KO/TKO, 91 submissions) against a 53% archive baseline.
41.3% reached the judges; 43 of 162 decisions were split (26.5%).
Average elapsed time to a stoppage in this sample: 5:13 of fight time.
18 championship assignments and 33 five-round bouts in the loaded archive.

Descriptive history from the loaded archive. A referee does not choose the matchup, styles or scheduled length, so finish and decision rates are context, not a causal signal.

Archive biography

Mario Yamasaki

Mario Yamasaki appears as the assigned referee in 392 archived UFC bouts currently loaded by PropBetEdge (historical coverage is still being backfilled, so this is not a career total) across 1999–2018. This profile treats officiating as context, not destiny: the rates below describe what happened in that historical sample and do not prove that the referee caused a finish, decision, pace change or judging outcome.

No externally sourced biography passed the identity check for this official, so the summary above is generated from our own archive rows only.

Notable assignments

Title fights, five-round bouts and main events in this referee's loaded archive, linked to the matchup pages.

Five rounds · LightweightKevin Lee vs Michael ChiesaUFC Fight Night: Chiesa vs. Lee · Jun 25, 2017Submission · R1 · 4:37 · Kevin Lee won Five rounds · HeavyweightDerrick Lewis vs Travis BrowneUFC Fight Night: Lewis vs. Browne · Feb 19, 2017KO/TKO · R2 · 3:12 · Derrick Lewis won Five rounds · Light HeavyweightRyan Bader vs Rogerio NogueiraUFC Fight Night: Bader vs. Nogueira · Nov 19, 2016KO/TKO · R3 · 3:51 · Ryan Bader won Five rounds · CatchweightCristiane Justino vs Lina LansbergUFC Fight Night: Cyborg vs. Lansberg · Sep 24, 2016KO/TKO · R2 · 2:29 · Cristiane Justino won Five rounds · WelterweightDonald Cerrone vs Alex OliveiraUFC Fight Night: Cowboy vs Cowboy · Feb 21, 2016Submission · R1 · 2:33 · Donald Cerrone won Title fight · LightweightEnrique Barzola vs Horacio GutierrezUFC Fight Night: Magny vs Gastelum · Nov 21, 2015Unanimous Decision · R3 · 5:00 · Enrique Barzola won

Recent assignments

The newest referee-tagged results currently present in the PropBetEdge UFC archive.

Feb 3, 2018Alan Patrick vs Damir HadzovicUFC Fight Night: Machida vs. AndersUnanimous Decision · R3 · 5:00 Feb 3, 2018Valentina Shevchenko vs Priscila CachoeiraUFC Fight Night: Machida vs. AndersSubmission · R2 · 4:25 Jan 14, 2018Irene Aldana vs Talita BernardoUFC Fight Night: Stephens vs. ChoiUnanimous Decision · R3 · 5:00 Jan 14, 2018Jessica-Rose Clark vs Paige VanZantUFC Fight Night: Stephens vs. ChoiUnanimous Decision · R3 · 5:00 Jan 14, 2018James Krause vs Alex WhiteUFC Fight Night: Stephens vs. ChoiUnanimous Decision · R3 · 5:00 Oct 28, 2017John Lineker vs Marlon VeraUFC Fight Night: Brunson vs. MachidaUnanimous Decision · R3 · 5:00

Profile details

Structured facts from the loaded archive and, where attached, a verified source. Unavailable facts are omitted rather than guessed.

Full name: Mario Yamasaki
Archive tenure: 1999–2018 · first loaded bout May 7, 1999
Most recent bout: Feb 3, 2018
Archived assignments: 392 in the loaded archive — not a career total; historical coverage is still being backfilled
Title fights: 18
Outcomes: 132 KO/TKO · 91 submissions · 162 decisions (43 split) · 4 NC/draws
Average stoppage: 5:13

Related events

Cards this referee worked in the loaded archive.

Feb 2018UFC Fight Night: Machida vs. AndersBelem · Brazil Jan 2018UFC Fight Night: Stephens vs. ChoiSt. Louis · USA Oct 2017UFC Fight Night: Brunson vs. MachidaSao Paulo · Brazil Jun 2017UFC Fight Night: Chiesa vs. LeeOklahoma City · USA Jun 2017UFC 212: Aldo vs. HollowayRio de Janeiro · Brazil Apr 2017UFC on FOX: Johnson vs. ReisKansas City · USA Mar 2017UFC Fight Night: Belfort vs. GastelumFortaleza · Brazil Feb 2017UFC Fight Night: Lewis vs. BrowneHalifax · Canada

Assignment archive

Up to 80 recent loaded UFC bouts. Result source links remain attached at row level.

Date	Event	Fight	Result	Round / time	Source
Feb 3, 2018	UFC Fight Night: Machida vs. Anders	Alan Patrick vs Damir Hadzovic	Unanimous Decision Alan Patrick won	R3 · 5:00	UFC Stats ↗
Feb 3, 2018	UFC Fight Night: Machida vs. Anders	Valentina Shevchenko vs Priscila Cachoeira	Submission Valentina Shevchenko won	R2 · 4:25	UFC Stats ↗
Jan 14, 2018	UFC Fight Night: Stephens vs. Choi	Irene Aldana vs Talita Bernardo	Unanimous Decision Irene Aldana won	R3 · 5:00	UFC Stats ↗
Jan 14, 2018	UFC Fight Night: Stephens vs. Choi	Jessica-Rose Clark vs Paige VanZant	Unanimous Decision Jessica-Rose Clark won	R3 · 5:00	UFC Stats ↗

Important: “fight impact” here means historical context, not causation. A referee does not choose the matchup, fighter styles, skill gap or scheduled length, so finish and decision rates must be interpreted with sample size and those confounders in mind.