Carlos Ruíz is a Spanish professional wrestler best known under the ring name Axiom. He is signed to WWE, where he performs on the SmackDown brand under the ring name Axiom. He is a two-time NXT Tag Team Champions with Nathan Frazer with their second reign lasting 229 days. He is also known for his time in NXT UK, where he was the inaugural NXT UK Heritage Cup Champion.

He made his in-ring debut in the Spanish promotion WhiteWolf Wrestling (Triple W) at age 15. He also wrestled on various independent promotions like PWG, RevPro, CHIKARA, Progress, WxW, and many more.