Billy Quarantillo è un lottatore di MMA della categoria pesi leggeri. Il suo record nelle arti marziali miste è 18–8 (vittorie–sconfitte–pareggi). Scheda: 37 anni, altezza 178 cm, allungo 178 cm.
| Esito | Avversario | Metodo | Evento | Data |
|---|---|---|---|---|
| Loss | Carlos Diego Ferreira | Decision (unanimous) | UFC Fight Night: Gamrot vs. Salkilld | August 8, 2026 |
| Loss | Cub Swanson | KO (punch) | UFC on ESPN: Covington vs. Buckley | December 14, 2024 |
| Loss | Youssef Zalal | Submission (rear-naked choke) | UFC on ESPN: Ribas vs. Namajunas | March 23, 2024 |
| Win | Damon Jackson | Decision (unanimous) | UFC on ESPN: Sandhagen vs. Font | August 5, 2023 |
| Loss | Edson Barboza | KO (knee) | UFC on ESPN: Holloway vs. Allen | April 15, 2023 |
| Win | Alexander Hernandez | TKO (knees and punches) | UFC 282 | December 10, 2022 |
| Loss | Shane Burgos | Decision (unanimous) | UFC 268 | November 6, 2021 |
| Win | Gabriel Benítez | TKO (punches) | UFC on ESPN: Makhachev vs. Moisés | July 17, 2021 |
| Loss | Gavin Tucker | Decision (unanimous) | UFC 256 | December 12, 2020 |
| Win | Kyle Nelson | KO (punch) | UFC Fight Night: Waterson vs. Hill | September 12, 2020 |
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