Kevin Vallejos, born on December 8, 2001 in Mar del Plata, Argentina, began training in martial arts around age 16 and made his amateur debut in 2018. He transitioned to the professional ranks in 2021 at just 19 years old under the banner of the Brothers of Life MMA team. From the outset he showcased powerful striking, varied combinations, and a switch‑stance style that quickly set him apart in Argentina’s regional MMA scene.
Between September 2021 and early 2023, Vallejos amassed an unblemished undefeated streak in regional promotions including Supreme Warrior, Cobra Fighter, Circuito Argentino de MMA, and Samurai Fight House in Buenos Aires. During this stretch he secured multiple titles across bantamweight, flyweight, and lightweight divisions, amassing by early 2024 a professional record of 13–1 with the sole loss coming to Jean Silva on Dana White’s Contender Series in September 2023.
Vallejos earned his opportunity to fight for the UFC by rebounding emphatically on Contender Series in September 2024—where he delivered a stunning first‑round knockout of Cam Teague via a 20‑punch combination, earning a UFC contract and raising his record to 14–1. He made his UFC debut on March 15, 2025, stopping SeungWoo Choi by TKO in the opening round to bring his record to 15–1. His aggressive striking, fluid movement, and finishing prowess have drawn comparisons to elite featherweight stylists and marked him as one of Argentina’s top emerging prospects in the UFC.