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Michael Keith Chiesa (; born December 7, 1987) is an American professional mixed martial artist and sports analyst who currently competes in the Welterweight division of the Ultimate Fighting Championship (UFC). A professional since 2008, Chiesa was the winner of FX's inaugural .
Chiesa earned his way into The Ultimate Fighter house, and a $5,000 bonus, with a submission victory over Johnavan Vistante in the elimination rounds. He was chosen as the fifth pick for Team Faber. Chiesa's terminally ill father died shortly after his victory.
After teammate Al Iaquinta picked up the first win for Team Faber, his coach decided that Chiesa would fight Jeremy Larsen next. Chiesa would go on to defeat Larsen by unanimous decision after two rounds.
For his quarter-final fight, Chiesa was matched up with the highly favored prospect, Justin Lawrence. After a hard-fought two rounds, the judges declared a draw and the fight went to a third, "sudden-victory" round. Early in the third round, Chiesa was able to reverse Lawrence on the ground, gain a mount position and win the fight by TKO, earning a $5,000 knock-out bonus and a place in the semi-finals.
Chiesa was selected to fight Team Cruz fighter, James Vick, in the semi-final round. Chiesa won the fight by technical knockout in the second round. He moved on to the finals against Team Faber teammate Al Iaquinta.
Chiesa was expected to face Rafaello Oliveira on December 8, 2012, at UFC on Fox 5. However, Oliveira was forced out of the bout with a broken hand and replaced by Marcus LeVesseur. Then, the week of the event, Chiesa was forced out of the bout with LeVesseur with the shingles and the bout was scrapped altogether.
Chiesa next fought Anton Kuivanen on February 23, 2013, at UFC 157. Chiesa submitted Kuivanen with a rear-naked choke in the second round.
Chiesa was expected to face Reza Madadi on July 27, 2013, at UFC on Fox 8. However, on May 14, 2013, it was announced Madadi was pulled from the bout due to visa issues. Chiesa instead faced Jorge Masvidal. Chiesa was stopped by Masvidal in the second round due to a d'arce choke submission, resulting in the first defeat in his professional career.
Chiesa next faced Ultimate Fighter winner Colton Smith on November 6, 2013, at UFC Fight Night 31. He won the fight via submission in the second round. The win also earned Chiesa his second Submission of the Night bonus award.
Chiesa faced Francisco Trinaldo at UFC 173 on May 24, 2014. He won the fight via unanimous decision.
Chiesa faced Joe Lauzon on September 5, 2014, at UFC Fight Night 50. After a back and forth fight, Lauzon defeated Chiesa via TKO in the second round after opening a significant cut above Chiesa's right eye, forcing a doctor's stoppage. The performance earned both participants Fight of the Night honors.
Chiesa faced Mitch Clarke on April 4, 2015, at UFC Fight Night 63. He won the fight by unanimous decision.
Chiesa faced Jim Miller on December 10, 2015, at UFC Fight Night 80. He won the fight via submission in the second round. The bout also earned Chiesa his second Fight of the Night bonus award.
Chiesa faced Beneil Dariush on April 16, 2016, at UFC on Fox 19. He won the bout via submission in the second round and was also awarded a Performance of the Night bonus.
Chiesa was expected to face Tony Ferguson on July 13, 2016, at UFC Fight Night 91. However, Chiesa pulled out of the fight on June 27 citing a back injury and was replaced by promotional newcomer Lando Vannata.
Chiesa faced Kevin Lee on June 25, 2017, at UFC Fight Night 112. At a UFC summer kick off press conference in association with UFC 211, Kevin Lee mentioned Chiesa's mother had tickets to the show, in which Chiesa responded "don't you ever talk about my mom". This verbal altercation ultimately led to punches being thrown, and both were escorted from the stage. Chiesa lost the fight via technical submission at the end of the first round. He appealed to the Oklahoma State Athletic Commission to overturn the defeat, claiming referee Mario Yamasaki erred both in stopping the fight despite no tapout nor loss of consciousness and in allowing Lee to use illegal downward elbows, which cut his head. Later, the appeal was dismissed by the commission.
Albeit having one fight left on his contract, Chiesa signed a new four-fight deal with UFC at the end of August 2017.
On September 10, 2018, Chiesa told the media he has sued McGregor for assault, battery, and intentional infliction of emotional distress. He also sued Barclay's Center for negligence, although he didn't disclose the amounts or further details of either of the cases. In early 2022 news surfaced that the attorneys of both fighters filed for stipulation of discontinuance with prejudice, having reached a settlement in the process.
The bout with Pettis was rescheduled to UFC 226. At weight-ins, Chiesa weighed in at 157.5 pounds, 1.5 pounds over the lightweight limit of 156 pounds. As a result, the fight proceeded at a catchweight bout and Chiesa forfeited 30% of his purse to Pettis. Chiesa lost the fight via submission in round two. Shortly after the loss, Chiesa announced going up to welterweight division.
Chiesa faced Diego Sanchez on July 6, 2019, at UFC 239. He won the fight via unanimous decision. Chiesa dedicated the win to the memory of Jess Roskelley.
Chiesa faced Rafael dos Anjos on January 25, 2020, at UFC Fight Night 166. He won the fight via unanimous decision.
Chiesa faced Neil Magny on January 20, 2021, at UFC on ESPN 20. Chiesa won the fight via unanimous decision after controlling Magny on the ground for most of the 5 rounds.
Chiesa faced Vicente Luque on August 7, 2021, at UFC 265. He lost the fight via a submission in round one.
Chiesa faced Sean Brady on November 20, 2021, at UFC Fight Night 198. He lost the bout via unanimous decision.
Chiesa was scheduled to face Li Jingliang on April 8, 2023, at UFC 287. However, Jingliang pulled out of the bout due to a spine injury.
Chiesa faced Kevin Holland on July 29, 2023, at UFC 291, losing the bout via a brabo choke submission in round one.
Chiesa faced Tony Ferguson on August 3, 2024 at UFC on ABC 7. He won the fight via a rear-naked choke submission in the first round.
On his birthday, Chiesa faced Max Griffin on December 7, 2024 at UFC 310. He won the fight via a rear-naked choke submission in the third round.
Chiesa was scheduled to compete against a to be determined opponent on February 22, 2025 at UFC Fight Night 252. However, no opponent was ever announced so he was removed from the card.
Chiesa faced Court McGee on June 14, 2025, at UFC on ESPN 69. He won the fight by unanimous decision.
Chiesa is scheduled to face Carlston Harris on March 28, 2026 at UFC Fight Night 271.
Since on May 27, 2018, Chiesa has been regularly acting as a desk analyst at UFC events. In 2025 he made his commentary debut on Week Four of Dana White's Contender Series Season Nine.
|- |Win |align=center|4–0 | James Vick | TKO (punches) | rowspan=4| | (Live airdate) |align=center|2 |align=center|1:55 |rowspan=4|Las Vegas, Nevada, United States | |- |Win |align=center|3–0 | Justin Lawrence | TKO (punches) | (Live airdate) |align=center|3 |align=center|1:02 | |- |Win |align=center|2–0 | Jeremy Larsen | Decision (unanimous) | (Live airdate) |align=center|2 |align=center|5:00 | |- |Win |align=center|1–0 | Johnavan Vistante | Submission (rear-naked choke) | (Live airdate) |align=center|1 |align=center|2:05 | |-
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