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Sailor · 2016–2026

Ibuki Koizumi

rnzys 49erMatch racingJ/70

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Events
19

191 races · 10 race wins

Win rate
11%

11% win rate · 2 of 19

Podium rate
11%

2 top-three finishes

Typically beats
45%

of boats faced (range 43%–48%, 1,108 boats)

Best class ranking
#91

Crew in 49er · rating 130

Longest win streak
3

race wins in a row

Most successful partnership
Leo Takahashi

1 wins · 1 podiums in 11 events together · 9% win rate

Biggest lift
Leo Takahashi

+12 points of fleet beaten when sailing together

Longest-running crew
Leo Takahashi

Jul 2017 – Feb 2020 · 11 events

Nemesis
Benjamin Bildstein

29–81 head to head in 113 races

Rival
Andrew Mollerus

53–73 in 132 races

Best day
1 Sep 2018

12-1-4-11-3 · 2018 49er, 49erFX, and Nacra 17 (U23) Junior World Chapionship

Signature result
7th of 52

2018 49er, 49erFX, and Nacra 17 (U23) Junior World Chapionship · 49er · 28 Aug 2018

Partnerships · 13 sailors

Most successful partnership: Leo Takahashi — 1 wins · 1 podiums in 11 events together · 9% win rate
  • Leo Takahashi · Kaijin, KINTAMA, Leo Takahashi, Leo TAKAHASHI · 49er, Match racing 11events 1 wins together · 1 podiums · 9% win rate · 7 of 106 races won Beat 56% of the fleet together(+12 vs. without) · best 1st · Jul 2017 – Feb 2020
  • Leonard Takahashi · Leonard TAKAHASHI, TAKAHASHI / KOIZUMI · 49er 3events 0 wins together · 0 podiums · 3 events · 0 of 32 races won Beat 38% of the fleet together(−15 vs. without) · best 16th · Oct 2017 – Jun 2018
  • Ryo Leonard Takahashi · Koizumi/Takahashi, Ryo Leonard Takahashi · 49er M, Match racing 2events 1 wins together · 1 podiums · 2 events · 3 of 16 races won Beat 70% of the fleet together · best 1st · Jul 2016 – Aug 2019
  • Kotaro Matsuo · Ibuki KOIZUMI, JPN 26 · 49er 2events 0 wins together · 0 podiums · 2 events · 0 of 28 races won Beat 31% of the fleet together · best 62nd · Mar 2026 – Jul 2026
  • Fumiya Kobayashi · The SLED · J/70 1events 0 wins together · 0 podiums · 1 events · 0 of 9 races won Beat 34% of the fleet together · best 30th · Sep 2023 – Sep 2023
  • Hideyuki Miyagawa · The SLED · J/70 1events 0 wins together · 0 podiums · 1 events · 0 of 9 races won Beat 34% of the fleet together · best 30th · Sep 2023 – Sep 2023
  • George Rush – RNZYS · Leo Takahashi · Match racing 1events 1 wins together · 1 podiums · 1 events · 3 of 4 races won Beat 100% of the fleet together · best 1st · Feb 2018 – Feb 2018
  • Tetsuya Yokoyama · The SLED · J/70 1events 0 wins together · 0 podiums · 1 events · 0 of 9 races won Beat 34% of the fleet together · best 30th · Sep 2023 – Sep 2023
  • Joshua Wijohn · Leo Takahashi · Match racing 1events 1 wins together · 1 podiums · 1 events · 3 of 4 races won Beat 100% of the fleet together · best 1st · Feb 2018 – Feb 2018
  • Taylor Balogh · Leo Takahashi · Match racing 1events 1 wins together · 1 podiums · 1 events · 3 of 4 races won Beat 100% of the fleet together · best 1st · Feb 2018 – Feb 2018

Lift shows how much better this sailor finishes with that partner aboard.

Rating history

09919820172019202120232025Helm rating, all classesCrew rating, all classes

— Helm rating, all classes · - - Crew rating, all classes

Event history · 19

DateEventBoatClassRoleFinish
7 Jul 202649er, 49er FX and Nacra 17 - European Championships 2026Ibuki KOIZUMI49erSkipper62nd / 93
31 Mar 202655 Trofeo S.A.R. Princesa SofíaJPN 2649erSkipper73rd / 101
21 Sep 20232023 J/70 North American ChampionshipThe SLEDJ/70Spinnaker trimmer30th / 45
10 Feb 20202020 World ChampionshipLeo TAKAHASHI49erCrew32nd / 78
25 Nov 20192019 Oceania ChampionshipKINTAMA49erCrew70th / 84
27 Aug 2019Hempel World Cup Series 2020 | Enoshima, JPNTAKAHASHI / KOIZUMI49erCrew28th / 37
17 Aug 2019SOG20 TEV19Koizumi/Takahashi49er MCrew13th / 21
26 Jun 2019Kieler Woche 2019Leo TAKAHASHI49erCrew30th / 82
15 Apr 2019Hempel World Cup Series 2019 | Genoa, ITATAKAHASHI / KOIZUMI49erCrew32nd / 65
2 Apr 201950 Trofeo S.A.R. Princesa Sofía IBEROSTARTHE BEAST49erCrew31st / 108
11 Sep 2018World Cup Series | Enoshima, JapanTAKAHASHI / KOIZUMI49erCrew8th / 27
28 Aug 20182018 49er, 49erFX, and Nacra 17 (U23) Junior World ChapionshipLeo TAKAHASHI49erCrew7th / 52
4 Aug 20182018 Hempel Sailing World Championships AarhusTAKAHASHI / KOIZUMI49erCrew51st / 86
20 Jun 2018Kieler Woche 2018Leonard TAKAHASHI49erCrew46th / 85
22 May 2018Medemblik Regatta 2018Leonard TAKAHASHI49erCrew24th / 45
10 Feb 2018RNZYS Nespresso Youth International 2018Leo TakahashiMatch racingCrew1st / 2
17 Oct 20172018 World Cup Series | Gamagori, JapanTAKAHASHI / KOIZUMI49erCrew16th / 20
30 Jul 2017Europeans 49er, 49erFX & Nacra17Kaijin49erCrew71st / 94
20 Jul 201650th Governor's Cup Junior Championship 2016Ryo Leonard TakahashiMatch racingCrew1st / 2

Crew rating across all classes: 198, #15,119.Helm rating across all classes: 12. Compiled from public results; not an official ranking.