Nick Klein, detto «Blue Collar», è un lottatore di MMA della categoria pesi medi. Il suo record nelle arti marziali miste è 6–3 (vittorie–sconfitte–pareggi). Scheda: 31 anni.
| Esito | Avversario | Metodo | Evento | Data |
|---|---|---|---|---|
| Loss | Andrey Pulyaev | TKO | UFC Fight Night: Taira vs. Park | August 2, 2025 |
| Loss | Mansur Abdul-Malik | TKO | UFC Fight Night: Cejudo vs. Song | February 22, 2025 |
| Win | Heraldo Souza | Submission | Dana White's Contender Series: Season 8, Week 10 | October 16, 2024 |
| Win | Cory Simpson | Submission (Rear Naked Choke) | MCC | AFC: Thanksgiving Throwdown | November 22, 2023 |
| Win | Collin Huckbody | Submission (Rear Naked Choke) | Ignite Fights: No Mercy 11 | May 20, 2023 |
| Loss | Dorjan Dokaj | TKO | BTC 16: Challenger Series 1 | July 9, 2022 |
| Win | Tristan Overig | Decision (unanimous) | LFA 131: Argueta vs. Silva | May 7, 2022 |
| Win | Kacey Joe Sanders | TKO | Pure FC 21 | February 5, 2022 |
| Win | Dan Almario | TKO (injury) | Pure FC 19 | June 27, 2021 |
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