| 2026-10-03 | UFC 332: Silva vs. Wang | Heavyweight | Johnny Walker def. Mick Parkin | KO (knee) | 1 | 3:35 |
| 2026-04-11 | UFC 327: Procházka vs. Ulberg | Light Heavyweight | Dominick Reyes def. Johnny Walker | Decision (split) (29–28, 28–29, 29–28) | 3 | 5:00 |
| 2025-08-23 | UFC Fight Night: Walker vs. Zhang | Light Heavyweight | Johnny Walker def. Zhang Mingyang | TKO (leg kicks and punches) | 2 | 2:37 |
| 2024-06-22 | UFC on ABC: Whittaker vs. Aliskerov | Light Heavyweight | Volkan Oezdemir def. Johnny Walker | KO (punch) | 1 | 2:28 |
| 2024-01-13 | UFC Fight Night: Ankalaev vs. Walker 2 | Light Heavyweight | Magomed Ankalaev def. Johnny Walker | KO (punches) | 2 | 2:42 |
| 2023-10-21 | UFC 294: Makhachev vs. Volkanovski 2 | Light Heavyweight | Magomed Ankalaev vs. Johnny Walker | No Contest (illegal knee) | 1 | 3:13 |
| 2023-05-13 | UFC on ABC: Rozenstruik vs. Almeida | Light Heavyweight | Johnny Walker def. Anthony Smith | Decision (unanimous) (29–28, 30–27, 30–27) | 3 | 5:00 |
| 2023-01-21 | UFC 283: Teixeira vs. Hill | Light Heavyweight | Johnny Walker def. Paul Craig | TKO (punches) | 1 | 2:16 |
| 2022-09-10 | UFC 279: Diaz vs. Ferguson | Light Heavyweight | Johnny Walker def. Ion Cuțelaba | Submission (rear-naked choke) | 1 | 4:37 |
| 2022-02-19 | UFC Fight Night: Walker vs. Hill | Light Heavyweight | Jamahal Hill def. Johnny Walker | KO (punch) | 1 | 2:55 |
| 2021-10-02 | UFC Fight Night: Santos vs. Walker | Light Heavyweight | Thiago Santos def. Johnny Walker | Decision (unanimous) (48–47, 48–47, 48–47) | 5 | 5:00 |
| 2020-09-19 | UFC Fight Night: Covington vs. Woodley | Light Heavyweight | Johnny Walker def. Ryan Spann | KO (elbows and punches) | 1 | 2:43 |
| 2020-03-14 | UFC Fight Night: Lee vs. Oliveira | Light Heavyweight | Nikita Krylov def. Johnny Walker | Decision (unanimous) (30–27, 29–28, 29–28) | 3 | 5:00 |
| 2019-11-02 | UFC 244: Masvidal vs. Diaz | Light Heavyweight | Corey Anderson def. Johnny Walker | TKO (punches) | 1 | 2:07 |
| 2019-03-02 | UFC 235: Jones vs. Smith | Light Heavyweight | Johnny Walker def. Misha Cirkunov | TKO (flying knee and punches) | 1 | 0:36 |
| 2019-02-02 | UFC Fight Night: Assunção vs. Moraes 2 | Light Heavyweight | Johnny Walker def. Justin Ledet | TKO (spinning back fist and punches) | 1 | 0:15 |
| 2018-11-17 | UFC Fight Night: Magny vs. Ponzinibbio | Light Heavyweight | Johnny Walker def. Khalil Rountree Jr. | KO (elbow) | 1 | 1:57 |