Alex Castro is a Guamanian mixed martial artist with a 9-9 professional record before entering BKFC for the first time. Half of his professional wins in MMA have come by way of T/KO and the wide majority of his wins by finish.

Castro has fought in Pacific X-treme Combat for most of his career and most recently won a title in Brawl International - both promotions are based out of Guam. Despite Guam not being known for its MMA talent pool, Castro has risen to the top and caught the eyes of BKFC matchmakers for his entertaining, fight at all costs approach to the game.  

Castro first fought bare-knuckle at BKFC Thailand 4 against Gustaf Cedermalm, but fell short in a solid back-and-forth war which included five knockdowns and over 230 punches landed.