Derek Cook

Derek Cook was listed 4-2 as an amateur entering Spirit Warrior 4. That night he won a vacant amateur welterweight title, submitting Denis Byaliy with a rear-naked choke at 1:22 of round 1. At Spirit Warrior 5 he headlined, keeping the amateur welterweight title with a five-round unanimous decision over Orbelin Maldonado.

On these cards

• Spirit Warrior V

  September 19, 2026 · def. Orobelin Maldonado · Welterweight title

  Unanimous decision · 5 rounds

• Spirit Warrior IV

  June 20, 2026 · def. Denis Byaliy · Vacant welterweight title

  Rear Naked Choke · R1 1:22