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Jon Merin

Rom jiu-jitsu team

W–L
0–1
Won and lost rating-eligible matches in the past 12 months.
Gi
1,148
Rating based on Gi matches in the past 12 months.
No-Gi
-
Rating based on No-Gi matches in the past 12 months.
Current form
0–1
Results from the ten most recent rating-eligible matches.
Opponents
1
Unique opponents faced in rating-eligible matches in the past 12 months.

Indexed career

Matches

5
Indexed competition matches
Date Opponent Result Event Division
2026-06-27 Arturo Braniste
Loss
WORLD CUP BJJ 2026 Gi · Juvenile Boys GI / White / Juvenile / -62,0 kg (Feather)
2025-07-19 Carlos Romero
Loss
SUMMER CUP BJJ GI & NO-GI 2025 Gi · Juvenile Boys GI / White / Juvenile / -57,0 kg (Light feather)
2025-06-28 Ruben Martinez Chirivella
Loss
WORLD CUP BJJ 2025 Gi · Juvenile Boys GI / White / Juvenile / -57,0 kg (Light feather)
2025-06-28 Mateo Viccicontte
Win
WORLD CUP BJJ 2025 Gi · Juvenile Boys GI / White / Juvenile / -57,0 kg (Light feather)
2025-06-28 Gianfranco Pratolongo
Win
WORLD CUP BJJ 2025 Gi · Juvenile Boys GI / White / Juvenile / -57,0 kg (Light feather)

Calculation details

Rating breakdown for the past 12 months

See the published month-end rating and the rating-eligible matches added in each month. Open a month for details.

August 2026 No new matches Change 0 Rating 1,148

Rating-period composition

Rating matches
1 0
Record
0–1 Previous month 0–1
Opponents
1 0
Events
1 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

July 2026 No new matches · 1 left period Change +16 Rating 1,148

Rating-period composition

Rating matches
1 -1
Record
0–1 Previous month 0–2
Opponents
1 -1
Events
1 -1

1 older matches left the 12-month period: 0 won and 1 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

June 2026 1 new match · 3 left period Change -117 Rating 1,132

Rating-period composition

Rating matches
2 -2
Record
0–2 Previous month 2–2
Opponents
2 -2
Events
2 0

3 older matches left the 12-month period: 2 won and 1 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Loss
June 27, 2026 Arturo Braniste
WORLD CUP BJJ 2026 Juvenile Boys GI / White / Juvenile / -62,0 kg (Feather)
Method Submission 01:30 0–0
Marginal influence -19
May 2026 No new matches Change -1 Rating 1,249

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

April 2026 No new matches Change -8 Rating 1,250

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

March 2026 No new matches Change +1 Rating 1,258

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

February 2026 No new matches Change +4 Rating 1,257

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

January 2026 No new matches Change +1 Rating 1,253

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

December 2025 No new matches Change +1 Rating 1,252

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

November 2025 No new matches Change -3 Rating 1,251

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

October 2025 No new matches Change +3 Rating 1,254

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

September 2025 No new matches Change +3 Rating 1,251

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

Relevant matches
1
Official ranking percentile
-
Performance
-

1 weighted matches against 1 different opponents across 1 events

Weighted win rate
-
Expected win rate
-
Average opponent rating
1,595
Repeated-opponent share
0.0%
Network connectivity
80.9%

Classification evidence

Why U18?

Within the published period from 2025-09-01 through 2026-08-31, only competition ages recorded at events in the calculation year determine this outcome, with at most one vote per event. Without such an age, the most recent unambiguous earlier competition age is projected to the calculation year; bracket evidence is the final fallback. The newest evidence breaks a tie.

Evidence outcome

  • U18 1 event vote Selected outcome

Registrations and outcomes

WORLD CUP BJJ 2026
U18 · Counts
Juvenile Boys GI / White / Juvenile / -62,0 kg (Feather)
  • Competition age 17
  • Registered age: u18
  • Source category: u18

Classification evidence

Why ≤ 62 kg?

This outcome uses at most one unambiguous upper weight limit per completed ranking event from 2025-09-01 through 2026-08-31. Only the three most recent eligible events are considered, and the lightest verified upper limit is selected. A higher division is not treated as measured body weight.

Evidence outcome

  • ≤ 62 kg 1 competition event Selected outcome

Registrations and outcomes

WORLD CUP BJJ 2026
≤ 62 kg · Counts as a competition event
Juvenile Boys GI / White / Juvenile / -62,0 kg (Feather)
  • Registered weight class: -62,0 kg (Feather)
  • Source competition limit: -62,0 kg (Feather)

1 match in the rating period

Classification evidence

Why White?

This outcome uses the belt category of every rating-eligible match from 2025-09-01 through 2026-08-31. The most-fought category is selected; the newest evidence breaks a tie.

Evidence outcome

  • white 1 match in the rating period Selected outcome

Registrations and outcomes

WORLD CUP BJJ 2026
white · Counts as a match
Juvenile Boys GI / White / Juvenile / -62,0 kg (Feather)
  • Source belt category: white

1 match in the rating period