Action & Reaction MMA
Niko Antoniewicz is a Brazilian Jiu-Jitsu competitor out of Action & Reaction MMA. JitsDex holds 5 matches across 11 events, going back to Oct 2025 — a 1–4 record compiled from Smoothcomp tournament results.
11 events · 5 matches · 14 gold · first event on record Oct 2025 · jitsdex.com
Newest first. The record shown is the running head-to-head against that opponent at the time.
| Opponent | Result | H2H | Event | Date |
|---|---|---|---|---|
|
Loyal Robinson
Toronto Top Team
|
Loss · points | 0–1 | 2026 Oshawa BJJ Open | 2026-07-25 |
|
Victor Vieira
Halifax BJJ
|
Loss · points | 0–1 | 2026 Oshawa BJJ Open | 2026-07-25 |
|
Anastasia Walker
King of the Mats
|
Win · submission | 1–0 | NextGen Toronto 2026 10th Year Anniversary | 2026-07-11 |
|
Austin Pagonis
Toronto Jiu-Jitsu Club
|
Loss · points | 0–1 | NextGen Toronto 2026 10th Year Anniversary | 2026-07-11 |
|
Leandro Da Costa
Warrior Mixed Martial Arts - Newmarket
|
Loss · submission | 0–1 | 2025 Ontario Open NoGi + ACE Cup Gi | 2025-10-25 |