Sean O'Malley, a renowned mixed martial artist, has compiled an impressive record of 18 wins, 3 losses, and 1 no contest (NC) in his career. Competing primarily in the UFC's bantamweight division at 135 lbs., he stands tall at 5' 11' with a reach of 72'. In the octagon, O'Malley has demonstrated a striking prowess, averaging 6.3 significant strikes per minute and maintaining an accuracy rate of 61%. His opponents have managed to land only 3.48 strikes per minute against him, with a strike defense of 60%. He has shown a moderate takedown attempt rate of 0.27 per 15 minutes and a takedown accuracy of 42%. Throughout his UFC career, O'Malley has achieved notable victories, including a knockout win over Aljamain Sterling, who held an ELO rating of 1186 at the time. His most recent five fights have been significant, with wins against Petr Yan and Aljamain Sterling, as well as a split decision victory over Marlon Vera. However, he has also faced defeats from Merab Dvalishvili, both times via submission guillotine choke and unanimous decision. His last fight took place on June 7, 2025.
| Date | Event | Opponent | Method | Round | Time | Result |
|---|---|---|---|---|---|---|
| 2025-06-07 | UFC 316: Dvalishvili vs. O'Malley 2 | Merab Dvalishvili | SUB Guillotine Choke | 3 | 4:42 | Loss |
| 2024-09-14 | UFC 306: Riyadh Season Noche UFC | Merab Dvalishvili | U-DEC | 5 | 5:00 | Loss |
| 2024-03-09 | UFC 299: O'Malley vs. Vera 2 | Marlon Vera | U-DEC | 5 | 5:00 | Win |
| 2023-08-19 | UFC 292: Sterling vs. O'Malley | Aljamain Sterling | KO/TKO Punches | 2 | 0:51 | Win |
| 2022-10-22 | UFC 280: Oliveira vs. Makhachev | Petr Yan | S-DEC | 3 | 5:00 | Win |
| 2022-07-02 | UFC 276: Adesanya vs. Cannonier | Pedro Munhoz | CNC | 2 | 3:09 | Loss |
| 2021-12-11 | UFC 269: Oliveira vs. Poirier | Raulian Paiva | KO/TKO Punches | 1 | 4:42 | Win |
| 2021-07-10 | UFC 264: Poirier vs. McGregor 3 | Kris Moutinho | KO/TKO Punches | 3 | 4:33 | Win |
| 2021-03-27 | UFC 260: Miocic vs. Ngannou | Thomas Almeida | KO/TKO Punch | 3 | 3:52 | Win |
| 2020-08-15 | UFC 252: Miocic vs. Cormier 3 | Marlon Vera | KO/TKO Elbows | 1 | 4:40 | Loss |
| 2020-06-06 | UFC 250: Nunes vs. Spencer | Eddie Wineland | KO/TKO Punch | 1 | 1:54 | Win |
| 2020-03-07 | UFC 248: Adesanya vs. Romero | Jose Quinonez | KO/TKO Punches | 1 | 2:02 | Win |
| 2018-03-03 | UFC 222: Cyborg vs. Kunitskaya | Andre Soukhamthath | U-DEC | 3 | 5:00 | Win |
| 2017-12-01 | The Ultimate Fighter: A New World Champion Finale | Terrion Ware | U-DEC | 3 | 5:00 | Win |
| Fight # | Date | Opponent Name | Opponent ELO | Result | ELO Gained | ELO |
|---|---|---|---|---|---|---|
| 14 | 2025-06-07 | Merab Dvalishvili | 1180 | Loss | -14 | 1125 |
| 13 | 2024-09-14 | Merab Dvalishvili | 1150 | Loss | -16 | 1139 |
| 12 | 2024-03-09 | Marlon Vera | 1177 | Win | +18 | 1155 |
| 11 | 2023-08-19 | Aljamain Sterling | 1186 | Win | +24 | 1137 |
| 10 | 2022-10-22 | Petr Yan | 1148 | Win | 0 | 1113 |
| 9 | 2022-07-02 | Pedro Munhoz | 1102 | Loss | 0 | 1113 |
| 8 | 2021-12-11 | Raulian Paiva | 1021 | Win | +18 | 1113 |
| 7 | 2021-07-10 | Kris Moutinho | 1000 | Win | +18 | 1095 |
| 6 | 2021-03-27 | Thomas Almeida | 1026 | Win | +20 | 1077 |
| 5 | 2020-08-15 | Marlon Vera | 1092 | Loss | -15 | 1057 |
| 4 | 2020-06-06 | Eddie Wineland | 1014 | Win | +19 | 1072 |
| 3 | 2020-03-07 | Jose Quinonez | 1049 | Win | +22 | 1053 |
| 2 | 2018-03-03 | Andre Soukhamthath | 1021 | Win | +16 | 1031 |
| 1 | 2017-12-01 | Terrion Ware | 984 | Win | +15 | 1015 |