Table of Contents
1. Introduction
2. The Controversy: Yamasaki Stops Chiesa
3. Quick Stats
4. Main Event: Lee Stops Chiesa in R1 — But Was It Early?
5. Reyes’ Debut, Penn’s Return, Vettori & The Card
6. Full Results
7. Bonuses & Awards
8. Records & Milestones
9. Legacy & Impact
10. FAQ
Introduction
UFC Fight Night 112: Chiesa vs. Lee took place on Sunday, June 25, 2017 at Chesapeake Energy Arena in Oklahoma City, Oklahoma — broadcast live on Fox Sports 1 to 819,000 average viewers (905k peak, 319k FS2 prelims). The card drew 7,605 fans for a gate of $549,302. It was the second UFC event in Oklahoma City, following UFC Fight Night: Diaz vs. Guillard in September 2009. The main event was a lightweight bout between Michael Chiesa and Kevin Lee.
Lee stopped Chiesa by technical submission at 4:37 of round one in a finish that generated some of the most sustained controversy of any 2017 UFC stoppage. Referee Mario Yamasaki stopped the contest with Chiesa not having tapped and not having gone unconscious, judging that Chiesa had ceased active resistance to Lee’s rear-naked choke. Chiesa filed a formal appeal with the Oklahoma State Athletic Commission. The OSAC dismissed the appeal. No Fight of the Night bonus was awarded; Kevin Lee, Tim Boetsch, Dominick Reyes, and Jeremy Kimball each earned Performance of the Night.
The Controversy: Yamasaki Stops Chiesa
Late in round one, Lee established a rear-naked choke on Chiesa. With approximately 30 seconds remaining in the round, Chiesa stopped actively fighting the submission — his hands lowered and his resistance ceased. Mario Yamasaki, the referee, interpreted Chiesa’s cessation of movement as a tap or equivalent and stopped the fight. Chiesa’s post-fight position was unambiguous: he had not tapped and had not lost consciousness, and the stoppage was therefore premature and in error.
Chiesa filed a formal complaint and appeal citing two grounds: referee Yamasaki’s documented ‘long history of failing to meet the standards officials are held to’ and the allegedly illegal elbows Lee had delivered during the fight. The Oklahoma State Athletic Commission reviewed the appeal and dismissed it. The result stood. Lee earned his Performance of the Night bonus. The incident added to the existing body of criticism directed at Yamasaki’s officiating history. The OSAC ruling meant the stoppage controversy had no competitive consequence for either fighter.
Quick Stats
📅 Date: Sunday, June 25, 2017 (2nd UFC event in Oklahoma City)
📍 Venue: Chesapeake Energy Arena, Oklahoma City, Oklahoma
👥 Attendance: 7,605
💰 Gate: $549,302
📺 Broadcast: Fox Sports 1 — 819,000 avg. viewers (905k peak, 319k FS2 prelims)
🏆 Main Event: Michael Chiesa vs. Kevin Lee — Lightweight (Lee on 5-fight win streak; Chiesa TUF 15 champion)
✅ Result: Lee def. Chiesa via Technical Submission (RNC) — R1, 4:37 (PoN $50k; CONTROVERSIAL STOPPAGE by referee Yamasaki; Chiesa did not tap; not unconscious; Chiesa filed appeal; OSAC dismissed it)
Main Event: Lee Stops Chiesa in R1 — But Was It Early?
Lee was the more physical fighter in the opening minutes, pressuring Chiesa to the fence and working for takedowns. His wrestling and top control were notable assets: he secured a takedown, worked through Chiesa’s defensive guard, and systematically improved his position. The fight was not a striking exchange; it was a grappling-dominant performance that highlighted Lee’s LW contendership credentials before the finish controversy overshadowed his work.
With the rear-naked choke locked in late in the round, Chiesa’s physical resistance visibly decreased. Referee Yamasaki stepped in and stopped the fight at 4:37. Chiesa immediately stood and objected. His post-fight statement was that he was ‘riding it out’ to the end of the round and had not submitted. The debate was genuine: the threshold for a technical submission — where a fighter’s cessation of resistance constitutes an equivalent to a tap — is inherently subjective, and the Oklahoma stoppage fell on the more controversial side of that line.
Reyes’ Debut, Penn’s Return, Vettori & The Card
Dominick Reyes’ UFC debut was the card’s most significant competitive result in hindsight. Reyes — a 27-year-old California LHW who had gone 9-0 professionally before his UFC signing — stopped Joachim Christensen in 29 seconds with a series of ground strikes. The 29-second TKO earned Performance of the Night and introduced one of the most physically imposing LHW prospects of the 2017 class. He subsequently won seven consecutive UFC fights, producing the Jon Jones title fight at UFC 247 in February 2020.
BJ Penn’s second fight of his 2017 return produced a majority decision loss to Dennis Siver (28-28, 29-28, 29-27) at featherweight. The result confirmed that Penn’s return was not producing the competitive results that his pre-return anticipation had suggested. Tim Boetsch’s head kick TKO of Johny Hendricks at 0:46 of round two was the card’s most emphatic individual finish: Boetsch caught Hendricks — who was fighting at MW in his third fight at the new weight class — with a clean head kick and followed with uppercuts. Marvin Vettori’s early career MW appearance was a step in a trajectory that eventually produced a UFC MW title fight against Israel Adesanya at UFC 263 in June 2021.
Full Results
Main Card (Fox Sports 1)
Kevin Lee def. Michael Chiesa — Technical Submission (RNC) — R1, 4:37 — LW (PoN $50k; CONTROVERSIAL STOPPAGE by Yamasaki; Chiesa did not tap or go unconscious; appeal dismissed)
Tim Boetsch def. Johny Hendricks — TKO (head kick and punches) — R2, 0:46 — MW (PoN $50k; head kick landed clean; follow-up uppercuts finished; Hendricks 3rd MW fight)
Felice Herrig def. Justine Kish — Unanimous Decision (30-26, 30-26, 29-27) — Women’s SBW
Dominick Reyes def. Joachim Christensen — TKO (ground strikes) — R1, 0:29 — LHW (PoN $50k; REYES’ UFC DEBUT; 29-second TKO; future LHW title challenger)
Tim Means def. Alex Garcia — Unanimous Decision (29-28x3) — WW
Dennis Siver def. BJ Penn — Majority Decision (28-28, 29-28, 29-27) — FW (Penn’s 2nd fight of 2017 return; lost by majority decision; possibly penultimate UFC fight)
Preliminary & Early Prelim Card
Clay Guida def. Erik Koch — LW
Marvin Vettori def. [opponent] — MW (early career Vettori; future UFC MW title challenger)
Jeremy Kimball def. Josh Stansbury — LHW (PoN $50k for Kimball)
Anthony Martin def. Johnny Case — WW
Jared Gordon def. Marco Quinones — LW
D. Horcher def. Devin Powell — LW
Bonuses & Awards
🥇 Fight of the Night: NOT AWARDED
🥇 Performance of the Night: Kevin Lee + Tim Boetsch + Dominick Reyes + Jeremy Kimball — $50,000 each
Records & Milestones
• Dominick Reyes’ UFC debut — 29-second TKO; the beginning of a 7-fight UFC win streak that produced a LHW title fight against Jon Jones at UFC 247.
• One of the most discussed individual referee stoppages of 2017 — Chiesa formal appeal of Yamasaki’s decision (dismissed by OSAC).
• No Fight of the Night bonus awarded — four Performance of the Night bonuses instead.
Legacy & Impact
Reyes’ Oklahoma debut opened a UFC LHW career that produced wins over Ovince Saint Preux, Jeremy Kimball, Volkan Oezdemir, Chris Weidman, Jared Cannonier, and Jan Blachowicz before his title fight against Jon Jones at UFC 247 in February 2020 — one of the most controversial judging decisions in LHW title fight history, with many scoring the fight for Reyes. His Oklahoma debut 29-second TKO was the commercial introduction of one of LHW’s most physically imposing competitors of the period. Kevin Lee’s Oklahoma win produced a title fight booking against Tony Ferguson for the UFC LW interim championship at UFC 216 in October 2017.
The Chiesa stoppage controversy added to the documentation of referee inconsistency in the UFC’s 2017 season: two controversial stoppages within 14 days (Gastelum/Belfort overturned to NC on May 7 for marijuana, Yamasaki/Chiesa on June 25). Mario Yamasaki subsequently retired from refereeing before the end of 2017, citing personal reasons. BJ Penn’s Oklahoma loss to Siver was his second consecutive UFC defeat after his Phoenix loss to Rodriguez in January; his UFC career continued for two more fights in 2018 before he departed the organisation.
FAQ
Was the Chiesa stoppage a legitimate technical submission?
The technical submission category — sometimes called a referee stoppage in a submission hold — applies when a referee determines a fighter has ceased active resistance to a submission without explicitly tapping. The threshold is subjective and varies by official. In the Oklahoma contest, referee Yamasaki interpreted Chiesa’s physical relaxation as cessation of resistance equivalent to a tap. Chiesa’s position was that he was managing the choke, had not submitted, and was waiting for the round to end. Both interpretations were arguable, but the OSAC’s decision to dismiss the appeal confirmed the official result.
Who was Dominick Reyes before his UFC debut?
Reyes was a 27-year-old California LHW from Fontana who had gone 9-0 professionally with finishes in his last several fights before his UFC signing. He was physically large for LHW — 6’4” with an 80-inch reach — and had a striking-dominant style built on his athletic frame. His Oklahoma debut 29-second TKO of Christensen demonstrated the finishing power that would produce seven consecutive UFC wins. His Jon Jones title fight at UFC 247 was judged in Jones’ favour despite widespread media and fan belief that Reyes had won.
What was BJ Penn’s competitive status at this stage of his return?
Penn was 0-2 in his 2017 comeback after the January loss to Rodriguez (UD at FN103) and the June loss to Siver (majority decision at FN112). He was 38 years old. His featherweight performances showed the chin durability that had defined his career, but his output and footwork reflected his age and extended ring absence. The majority decision loss to Siver — where one judge scored the fight a draw — suggested a competitive closeness that the headline result did not fully convey. His UFC career produced two more fights in 2018: losses to Yancy Medeiros and Ryan Hall.
Why was no Fight of the Night awarded?
The UFC’s bonus structure allows for discretion in awarding the Fight of the Night bonus. When no fight meets the internal threshold for what constitutes the most entertaining bilateral exchange, the UFC sometimes chooses to award four individual Performance of the Night bonuses instead of the standard two-PoN plus FotN configuration. Oklahoma’s card produced four individual finishing performances that the UFC judged bonus-worthy: Lee’s submission, Boetsch’s head kick TKO, Reyes’ debut TKO, and Kimball’s finish.
What happened to Mario Yamasaki after this controversy?
Yamasaki had been one of the UFC’s most frequently criticised referees over a career spanning the late 2000s and 2010s. Multiple stoppages across his career had attracted complaints from fighters, media, and fans. The Chiesa controversy in June 2017 was one of his final high-profile assignments. He retired from UFC refereeing before the end of 2017, citing personal reasons. His retirement removed from the officiating roster a figure who had produced both legitimate stoppages and genuinely controversial ones across a long career.
Who was Tim Boetsch and why was his head kick KO of Hendricks significant?
Boetsch was a 34-year-old American middleweight who had been a UFC fighter since 2008. His most notable prior result was a head kick KO of Yushin Okami at UFC 152 in September 2012. His Oklahoma head kick TKO of Hendricks at 0:46 of R2 was his most celebrated individual UFC finish in years. Hendricks — a former UFC WW champion fighting at MW for the third time — was caught moving forward when Boetsch’s head kick landed. The speed of the finish (46 seconds of R2) and the quality of the target gave it commercial significance beyond its competitive context.