Thomas Petersen
Vitals
Height, reach, and career background.
- Age
- 31
- Height
- 6′1″1.85 m
- Reach
- 74″188 cm
- Weight class
- Heavyweight
- Nationality
- United States
- Team
- The Striking Institute
- Active
- 2019-present
Record
Tap expandable fights for their breakdowns.
LossRecord after fight: 11-5-0SUB

Walker closed the distance and pulled guard as soon as the pair clinched. Petersen defended the initial heel-hook attempt by rolling and extracting his leg. Walker trapped the calf, increased the pressure, and forced the tap.
Key moments
- Walker closed the distance and pulled guard as soon as the pair clinched.
- Petersen defended the initial heel-hook attempt by rolling and extracting his leg.
- Walker trapped the calf, increased the pressure, and forced the tap.
WinRecord after fight: 11-4-0DEC
UFC Fight Night 272 - Moicano vs. Duncan
4 Apr 2026

4 Apr 2026
Petersen's latest result was a majority decision win over Pat after three rounds. It was the kind of grinding heavyweight result that reinforced his ability to bank rounds even when the finish does not show up.
Key moments
- Won a majority decision over fifteen minutes.
- Stayed composed through a competitive three-round heavyweight fight.
- Returned to the win column after the Petrino loss.
LossRecord after fight: 10-4-0KO
UFC Fight Night 261 - Oliveira vs. Gamrot
11 Oct 2025

11 Oct 2025
Petersen was close to reaching the cards against Petrino, but the fight turned sharply in the final round when he was knocked out with 26 seconds gone.
Key moments
- Lost by third-round knockout.
- The stoppage came 26 seconds into round three.
- Saw a potential decision fight end suddenly late.
WinRecord after fight: 10-3-0DEC
Opponent: Don'Tale MayesunanimousR3 5:00
UFC on ESPN 67 - Sandhagen vs. Figueiredo
3 May 2025

3 May 2025
Petersen managed the Mayes fight over the full fifteen minutes and left with a unanimous decision.
Key moments
- Won a unanimous decision after three rounds.
- Rebounded directly from the Gaziev loss.
- Added another UFC win over an established heavyweight.

1 Feb 2025

20 Jul 2024

3 Feb 2024
29 Aug 2023
13 Jan 2023
16 Sep 2022

15 Apr 2022
30 Jul 2021
16 Apr 2021
15 Jan 2021
21 Feb 2020
WinRecord after fight: 1-0-0TKO
Opponent: B.J. LacypunchesR1 2:12
Driller Promotions - Mecca 16
21 Dec 2019
21 Dec 2019
J. Lacy at Mecca 16.
Key moments
- Won his professional debut by TKO at 2:12 of round one.
- The fight took place on the Mecca 16 card promoted by Driller Promotions.
- It was the first of Petersen's many opening-round heavyweight finishes.
The Read
Style, strengths, and defining traits.
Thomas Petersen won the LFA heavyweight title and two Minnesota state wrestling championships. He worked as a diesel mechanic before fighting.