Gertjan Koornstra + Follow

Grappling Industries AMSTERDAM 2026-05-03

• Lost vs Mohammed Anouar Chairi Bounekoub (SunFight)
  Gi Adult / Male / White / Adult / -155 lbs · Round 3 · points
• Won vs Mattes Harms (Checkmat Oldenburg)
  Gi Adult / Male / White / Adult / -155 lbs · Round 3 · submission
• Won vs Nick Oudmaijer (Combat & Fitness Academy)
  Gi Adult / Male / White / Adult / -155 lbs · Round 1 · walkover
• Won vs Alvaro Lopez Santos (Roger Gracie Amsterdam)
  Gi Adult / Male / White / Adult / -155 lbs · Round 1 · points

GrappleCity: Rotterdam Spring Open 2026-02-22

🥈 2nd Adult Gi / Adult / White / -73kg / Men

• Lost vs Oleg Hayovskiy (Haven BJJ)
  Adult Nogi / Beginner (White) / Adult / -73kg / Men · Round 2 · submission
• Won vs Ot Van Vreeswijk (Grappling070)
  Adult Nogi / Beginner (White) / Adult / -73kg / Men · Round 1 · points
• Lost vs Oleg Hayovskiy (Haven BJJ)
  Adult Gi / Adult / White / -73kg / Men · Round 3 · submission
• Won vs Adriaan Boxem (Renzo Gracie Holland)
  Adult Gi / Adult / White / -73kg / Men · Round 2 · points

VERSUS Championship 31 (NoGi) 2025-09-21

• Won vs Aron Ghzalale (SUBTERRA Brazilian Jiu-jitsu)
  Novice -76 A · Round 5 · points
• Lost vs Fabian Hoft (Bataille Gym)
  Novice -76 A · Round 4 · points
• Lost vs Jordi Van Der Voorn (Allroundboxing)
  Novice -76 A · Round 1 · submission
• Won vs Ivan Mishchanyuk (Haven BJJ)
  Novice -76 A · Round 3 · walkover