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NL

Florian Spiertz

Ruthless Fight Company

W–L
6–12
Won and lost rating-eligible matches in the past 12 months.
Gi
1,179
Rating based on Gi matches in the past 12 months.
No-Gi
1,297
Rating based on No-Gi matches in the past 12 months.
Current form
4–6
Results from the ten most recent rating-eligible matches.
Opponents
9
Unique opponents faced in rating-eligible matches in the past 12 months.

Honours

Medals and placements

Gold
1
Silver
6
Bronze
3
Total medals
10
Events with results
5

Full career record

Wins
7
Losses
12
Matches
19
Win rate
36.8%

Ways of winning

Submission
3
Points
3
Decision
0
Disqualification
0

Personal records

Longest winning streak
1
Longest submission streak
1

Recent recorded placements

  2. Grappling Industries AMSTERDAM

    NL Event record 1–3

    • No Gi Kids / 14 - 15 years (Male) / Beginner (White) / -125 lbs
    • Gi Kids / 14 - 15 years (Male) / White / -125 lbs

  3. 2026 AGF Netherlands Championships

    NL Event record 2–4

    • Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
    • No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
    • Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
    • No Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)

  4. Grappling Industries AMSTERDAM

    NL Event record 2–3

    • Gi Kids / 12 - 13 years (Male) / White / -125 lbs
    • No Gi Kids / 12 - 13 years (Male) / Beginner (White) / -125 lbs

12-month performance profile

How the results were achieved

Past 12 months
Current win streak
0
Unique opponents
9
Distinct events
5

Ways of winning

  • Submission 3 50%
  • Points 3 50%
  • Decision 0 0%
  • Other recorded result 0 0%

Gi versus No-Gi

Gi

Rating
1179
Record
2–6
Win rate
25%
Submission share
0%

No-Gi

Rating
1297
Record
4–6
Win rate
40%
Submission share
75%

Win quality

Grouped by pre-match win probability. This provides context and does not award an extra rating bonus.

As underdog 0–0 Less than 35% expected win probability before the match.
Even match 0–0 Between 35% and 65% expected win probability before the match.
As favourite 0–0 More than 65% expected win probability before the match.

Development

Rating and development

The same published rating, supported by trend, opponent strength and evidence quality.

Current rating
1,317
Change over 90 days
+120
Highest rating in 12 months
1,309
Performance versus expectation
-4.1 pp
Schedule strength
Top 60%
Average opponent rating
1,306
Weighted win rate
38%
Expected win rate
42%
Repeat-opponent share
50%
Effective evidence
11.2
Confidence
91/100

Opponents

Opposition and rivalries

The strongest recorded win, rematches and opponents faced repeatedly.

Rematches 4–12 4–12 across 16 rematches against 6 repeat opponents.
Most-faced opponent Ali Shendo 2–2 · 4 matches

Top 10 highest-ranked defeated opponents

Past 12 months

  1. #1159 Burak Tatlipinar · GrappleCity: Rotterdam Summer Open Sub 03:36 2–0

Full career

  1. #1159 Burak Tatlipinar · GrappleCity: Rotterdam Summer Open Sub 03:36 2–0

Rivals

Opponent Head-to-head record Matches
Ali Shendo 2–2 4
Erblin Ibrahimi 0–2 2

Around this athlete

Athlete Rank Rating
Itay SILVERA #817 1,317
Florian Spiertz #818 1,317

Recent tournaments

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 1,317

Rating-period composition

Rating matches
18 0
Record
6–12 Previous month 6–12
Opponents
9 0
Events
5 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 Change +2 Rating 1,317

Rating-period composition

Rating matches
18 0
Record
6–12 Previous month 6–12
Opponents
9 0
Events
5 0

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

June 2026 No new matches Change +6 Rating 1,315

Rating-period composition

Rating matches
18 0
Record
6–12 Previous month 6–12
Opponents
9 0
Events
5 0

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

May 2026 6 new matches Change +29 Rating 1,309

Rating-period composition

Rating matches
18 +6
Record
6–12 Previous month 4–8
Opponents
9 +3
Events
5 +2

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
May 23, 2026 Radostin Asenov
GrappleCity: Rotterdam Summer Open Teens NoGi / White / 14-15 years / -55kg / Boy
Method Disqualification 03:37 0–4
Marginal influence -9
Win
May 23, 2026 Burak Tatlipinar
GrappleCity: Rotterdam Summer Open Teens NoGi / White / 14-15 years / -55kg / Boy
Method Submission 03:36 2–0
Marginal influence +18
Loss
May 3, 2026 Radostin Asenov
Grappling Industries AMSTERDAM No Gi Kids / 14 - 15 years (Male) / Beginner (White) / -125 lbs
Method Points 04:00 0–4
Marginal influence -9
Win
May 3, 2026 Filip Saric
Grappling Industries AMSTERDAM No Gi Kids / 14 - 15 years (Male) / Beginner (White) / -125 lbs
Method Points 04:00 6–2
Marginal influence +26
Loss
May 3, 2026 Filip Saric
Grappling Industries AMSTERDAM Gi Kids / 14 - 15 years (Male) / White / -125 lbs
Method Points 04:00 0–7
Marginal influence -12
Loss
May 3, 2026 Sixten Snippe
Grappling Industries AMSTERDAM Gi Kids / 14 - 15 years (Male) / White / -125 lbs
Method Points 04:00 0–10
Marginal influence -6
April 2026 6 new matches Change +23 Rating 1,280

Rating-period composition

Rating matches
12 +6
Record
4–8 Previous month 2–4
Opponents
6 +3
Events
3 +1

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.
Win
April 18, 2026 Soufyan El Idrissi
2026 AGF Netherlands Championships No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
Method Submission 00:02 0–0
Marginal influence +16
Loss
April 18, 2026 Mark Laudermilch
2026 AGF Netherlands Championships No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
Method Points 04:00 4–13
Marginal influence -6
Loss
April 18, 2026 Mark Laudermilch
2026 AGF Netherlands Championships Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
Method Submission 00:57 0–0
Marginal influence -10
Loss
April 18, 2026 Sixten Snippe
2026 AGF Netherlands Championships Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
Method Submission 01:48 1–9
Marginal influence -5
Loss
April 18, 2026 Mark Laudermilch
2026 AGF Netherlands Championships No Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
Method Points 03:00 3–4
Marginal influence -6
Win
April 18, 2026 Mark Laudermilch
2026 AGF Netherlands Championships Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
Method Points 03:00 5–0
Marginal influence +9
March 2026 4 new matches Change +68 Rating 1,257

Rating-period composition

Rating matches
6 +4
Record
2–4 Previous month 1–1
Opponents
3 +1
Events
2 +1

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
March 1, 2026 Erblin Ibrahimi
Grappling Industries AMSTERDAM No Gi Kids / 12 - 13 years (Male) / Beginner (White) / -125 lbs
Method Submission 02:59 0–6
Marginal influence -10
Loss
March 1, 2026 Ali Shendo
Grappling Industries AMSTERDAM Gi Kids / 12 - 13 years (Male) / White / -125 lbs
Method Points 03:00 0–4
Marginal influence -8
Loss
March 1, 2026 Ali Shendo
Grappling Industries AMSTERDAM Gi Kids / 12 - 13 years (Male) / White / -125 lbs
Method Points 03:00 0–10
Marginal influence -8
Win
March 1, 2026 Ali Shendo
Grappling Industries AMSTERDAM Gi Kids / 12 - 13 years (Male) / White / -125 lbs
Method Points 03:00 2–0
Marginal influence +8
February 2026 2 new matches Change Starting point Rating 1,189

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
February 22, 2026 Erblin Ibrahimi
GrappleCity: Rotterdam Spring Open Teens NoGi / White / 12-13 years / -55kg / Boy
Method Submission 01:16 0–0
Marginal influence -10
Win
February 22, 2026 Melih Taha Altun
GrappleCity: Rotterdam Spring Open Teens NoGi / White / 12-13 years / -55kg / Boy
Method Submission 02:49 6–2
Marginal influence +13
Relevant matches
11.2
Official ranking percentile
Top 55%
Performance
4.1 pp below expectation

11.2 weighted matches against 9 different opponents across 5 events

Weighted win rate
38.4%
Expected win rate
42.5%
Average opponent rating
1,306
Repeated-opponent share
50.0%
Network connectivity
87.6%

Classification evidence

Why U16?

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

  • U16 5 event votes Selected outcome

Registrations and outcomes

GrappleCity: Rotterdam Summer Open
U16 · Counts
Teens NoGi / White / 14-15 years / -55kg / Boy
  • Competition age 14
  • Registered age: u16
  • Source category: u16
Teens Gi / White / 14-15 years / -55kg / Boy
  • Competition age 14
  • Registered age: u16
  • Source category: u16
Grappling Industries AMSTERDAM
U16 · Counts
No Gi Kids / 14 - 15 years (Male) / Beginner (White) / -125 lbs
  • Competition age 14
  • Registered age: u16
  • Source category: u16
Gi Kids / 14 - 15 years (Male) / White / -125 lbs
  • Competition age 14
  • Registered age: u16
  • Source category: u16
2026 AGF Netherlands Championships
U16 · Counts
Competition T-shirt / Adult Small
No Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
  • Competition age 14
  • Registered age: u18
  • Source category: u18
No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
  • Competition age 14
  • Registered age: u16
  • Source category: u16
Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
  • Competition age 14
  • Registered age: u18
  • Source category: u18
Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
  • Competition age 14
  • Registered age: u16
  • Source category: u16
Grappling Industries AMSTERDAM
U16 · Counts
No Gi Kids / 12 - 13 years (Male) / Beginner (White) / -125 lbs
  • Competition age 14
  • Registered age: u14
  • Source category: u14
Gi Kids / 12 - 13 years (Male) / White / -125 lbs
  • Competition age 14
  • Registered age: u14
  • Source category: u14
GrappleCity: Rotterdam Spring Open
U16 · Counts
Teens Gi / White / 14-15 years / -60kg / Boy
  • Competition age 14
  • Registered age: u16
  • Source category: u16
Teens NoGi / White / 12-13 years / -55kg / Boy
  • Competition age 14
  • Registered age: u14
  • Source category: u14

Classification evidence

Why ≤ 55 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

  • ≤ 55 kg 1 competition event Selected outcome
  • ≤ 57 kg 2 competition events

Registrations and outcomes

GrappleCity: Rotterdam Summer Open
≤ 55 kg · Counts as a competition event
Teens NoGi / White / 14-15 years / -55kg / Boy
  • Registered weight class: -55kg
  • Source competition limit: -55kg

2 matches in the rating period

GrappleCity: Rotterdam Summer Open
Does not count
Teens Gi / White / 14-15 years / -55kg / Boy
  • Registered weight class: -55kg
  • Source competition limit: -55kg

No matches in the rating period · no valid weight evidence

Grappling Industries AMSTERDAM
≤ 57 kg · Counts as a competition event
No Gi Kids / 14 - 15 years (Male) / Beginner (White) / -125 lbs
  • Registered weight class: -125 lbs
  • Source competition limit: -125 lbs

2 matches in the rating period

Grappling Industries AMSTERDAM
≤ 57 kg · Counts as a competition event
Gi Kids / 14 - 15 years (Male) / White / -125 lbs
  • Registered weight class: -125 lbs
  • Source competition limit: -125 lbs

2 matches in the rating period

2026 AGF Netherlands Championships
Does not count
Competition T-shirt / Adult Small

No matches in the rating period · no valid weight evidence

2026 AGF Netherlands Championships
≤ 57 kg · Counts as a competition event
No Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
  • Registered weight class: Middle I (Up to 56.70 kg)
  • Source competition limit: Middle I (Up to 56.70 kg)

1 match in the rating period

2026 AGF Netherlands Championships
≤ 57 kg · Counts as a competition event
No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
  • Registered weight class: Middle I (Up to 56.70 kg)
  • Source competition limit: Middle I (Up to 56.70 kg)

2 matches in the rating period

2026 AGF Netherlands Championships
≤ 57 kg · Counts as a competition event
Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
  • Registered weight class: Middle I (Up to 56.70 kg)
  • Source competition limit: Middle I (Up to 56.70 kg)

1 match in the rating period

2026 AGF Netherlands Championships
≤ 57 kg · Counts as a competition event
Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
  • Registered weight class: Middle I (Up to 56.70 kg)
  • Source competition limit: Middle I (Up to 56.70 kg)

2 matches in the rating period

Grappling Industries AMSTERDAM
≤ 57 kg · Does not count
No Gi Kids / 12 - 13 years (Male) / Beginner (White) / -125 lbs
  • Registered weight class: -125 lbs
  • Source competition limit: -125 lbs

1 match in the rating period · outside the three most recent unambiguous events

Grappling Industries AMSTERDAM
≤ 57 kg · Does not count
Gi Kids / 12 - 13 years (Male) / White / -125 lbs
  • Registered weight class: -125 lbs
  • Source competition limit: -125 lbs

3 matches in the rating period · outside the three most recent unambiguous events

GrappleCity: Rotterdam Spring Open
Does not count
Teens Gi / White / 14-15 years / -60kg / Boy
  • Registered weight class: -60kg
  • Source competition limit: -60kg

No matches in the rating period · no valid weight evidence

GrappleCity: Rotterdam Spring Open
≤ 55 kg · Does not count
Teens NoGi / White / 12-13 years / -55kg / Boy
  • Registered weight class: -55kg
  • Source competition limit: -55kg

2 matches in the rating period · outside the three most recent unambiguous events

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 18 matches in the rating period Selected outcome

Registrations and outcomes

GrappleCity: Rotterdam Summer Open
white · Counts as a match
Teens NoGi / White / 14-15 years / -55kg / Boy
  • Source belt category: white

2 matches in the rating period

Grappling Industries AMSTERDAM
white · Counts as a match
No Gi Kids / 14 - 15 years (Male) / Beginner (White) / -125 lbs
  • Source belt category: white

2 matches in the rating period

Grappling Industries AMSTERDAM
white · Counts as a match
Gi Kids / 14 - 15 years (Male) / White / -125 lbs
  • Source belt category: white

2 matches in the rating period

2026 AGF Netherlands Championships
white · Counts as a match
No Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
  • Source belt category: white

1 match in the rating period

2026 AGF Netherlands Championships
white · Counts as a match
No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
  • Source belt category: white

2 matches in the rating period

2026 AGF Netherlands Championships
white · Counts as a match
Gi Kids Challenger / Boys / White Challenger / Middle I (Up to 56.70 kg)
  • Source belt category: white

1 match in the rating period

2026 AGF Netherlands Championships
white · Counts as a match
Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle I (Up to 56.70 kg)
  • Source belt category: white

2 matches in the rating period

Grappling Industries AMSTERDAM
white · Counts as a match
No Gi Kids / 12 - 13 years (Male) / Beginner (White) / -125 lbs
  • Source belt category: white

1 match in the rating period

Grappling Industries AMSTERDAM
white · Counts as a match
Gi Kids / 12 - 13 years (Male) / White / -125 lbs
  • Source belt category: white

3 matches in the rating period

GrappleCity: Rotterdam Spring Open
white · Counts as a match
Teens NoGi / White / 12-13 years / -55kg / Boy
  • Source belt category: white

2 matches in the rating period