Below is the history of the ONE Championship Strawweight Muay Thai World championship:
Prajanchai PK Saenchai is the reigning undisputed champion. He unified the title against Joseph Lasiri at ONE Friday Fights 46 on December 22, 2023 with a first-round elbow knockout, returning the belt to Thailand after Lasiri’s 19-month reign as an Italian-Moroccan titleholder.
| # | Champion | Event | Date | Opponent |
|---|---|---|---|---|
| 5 | Prajanchai PK Saenchai | ONE Friday Fights 46 | December 22, 2023 | Joseph Lasiri (unification) |
| 4 | Prajanchai PK Saenchai (IC) | ONE Friday Fights 22 | June 23, 2023 | Sam-A Gaiyanghadao |
| 3 | Joseph Lasiri | ONE 157 | May 20, 2022 | Prajanchai PK Saenchai |
| 2 | Prajanchai PK Saenchai | ONE Championship: Battleground | July 30, 2021 | Sam-A Gaiyanghadao |
| 1 | Sam-A Gaiyanghadao | ONE: King of the Jungle | February 28, 2020 | Rocky Ogden |
All ONE Strawweight Muay Thai World Title fights
Every title bout contested for the ONE Strawweight Muay Thai World Championship, with the most recent at the top.
| Date | Event | Champion | Challenger | Method | Result |
|---|---|---|---|---|---|
| February 7, 2025 | ONE Fight Night 28 | Prajanchai PK Saenchai (c) | Ellis Badr Barboza | TKO (doctor stoppage) Rd 4 | Prajanchai retains |
| December 22, 2023 | ONE Friday Fights 46 | Joseph Lasiri (c) | Prajanchai PK Saenchai (IC) | KO (elbow) Rd 1 (1:28) | Prajanchai unifies and wins undisputed title |
| June 23, 2023 | ONE Friday Fights 22 | (Vacant Interim) | Prajanchai PK Saenchai vs Sam-A Gaiyanghadao | KO (right elbow) Rd 2 (2:10) | Prajanchai wins Interim title |
| May 20, 2022 | ONE 157 | Prajanchai PK Saenchai (c) | Joseph Lasiri | TKO (retirement) Rd 3 | Lasiri wins title |
| July 30, 2021 | ONE Championship: Battleground | Sam-A Gaiyanghadao (c) | Prajanchai PK Saenchai | Majority Decision | Prajanchai wins title |
| February 28, 2020 | ONE: King of the Jungle | (Vacant) | Sam-A Gaiyanghadao vs Rocky Ogden | Unanimous Decision | Sam-A wins inaugural title |