Jack Hermansson, detto «The Joker», è un lottatore di MMA della categoria pesi welter. Il suo record nelle arti marziali miste è 2–9 (vittorie–sconfitte–pareggi). Scheda: 38 anni, altezza 185 cm, allungo 196 cm.
| Esito | Avversario | Metodo | Evento | Data |
|---|---|---|---|---|
| Loss | Myktybek Orolbai | KO (punch) | UFC Fight Night: Tsarukyan vs. Hooker | 22 November 2025 |
| Loss | Gregory Rodrigues | KO (punch) | UFC 317 | 28 June 2025 |
| Win | Joe Pyfer | Decision (unanimous) | UFC Fight Night: Hermansson vs. Pyfer | 10 February 2024 |
| Loss | Roman Dolidze | TKO (punches) | UFC on ESPN: Thompson vs. Holland | 3 December 2022 |
| Win | Chris Curtis | Decision (unanimous) | UFC Fight Night: Blaydes vs. Aspinall | 23 July 2022 |
| Loss | Sean Strickland | Decision (split) | UFC Fight Night: Hermansson vs. Strickland | 5 February 2022 |
| Win | Edmen Shahbazyan | Decision (unanimous) | UFC Fight Night: Font vs. Garbrandt | 22 May 2021 |
| Loss | Marvin Vettori | Decision (unanimous) | UFC on ESPN: Hermansson vs. Vettori | 5 December 2020 |
| Win | Kelvin Gastelum | Submission (heel hook) | UFC Fight Night: Figueiredo vs. Benavidez 2 | 19 July 2020 |
| Loss | Jared Cannonier | TKO (punches) | UFC Fight Night: Hermansson vs. Cannonier | 28 September 2019 |
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