Marin Koseki

JapanJapanActive
Born
Sep 3, 2005 (21 years old)
Events
Long Jump

Marin Koseki is a Japan sprinter, born on September 3, 2005. She competes primarily in the 100m and LJ.

Her personal bests include 12.88 in the 100m and 5.73 in the LJ. She is currently active on the international athletics circuit, representing Japan.

Personal best · Long Jump5.73
2026 season best5.73May 31, 2026 · Nihon University Stadium, Tokyo
2026 season best
Last competitionThe 8th Nihon University CompetitionOct 11, 2026 · 5.42
The 8th Nihon University Competition

As of Nov 15, 2026: Long Jump 5.73, 2026 season best 5.73 (May 31, 2026, Nihon University Stadium, Tokyo (JPN)) · Last competition: The 8th Nihon University Competition, Oct 11, 2026, 5.42 · 21 years old

Personal bests

WA points calculator →
DisciplineResultAll-time
100mHachioji 2021Japan 100 m all-time list12.88825 pts–
LJTokyo 2026Japan Long Jump all-time list5.73940 pts–

Progression

SeasonDisciplineResultWindDateCompetitions
2026LJ 5.73-0.3May 31, 2026The 3rd Nihon University Competition
2025LJ 5.70+0.0May 18, 2025The 3rd Nihon University Competition, Nihon University Stadium, Tokyo
2024LJ 5.72+1.2Jun 1, 20243rd Nihon University Competition, Nihon University Athletics Stadium, Setagaya, Tokyo - Invitational Events
2023LJ 5.50+0.4Apr 22, 202386th Tokyo Athletics Open Championships
2022LJ 5.62+0.5Apr 30, 2022Komazawa Olympic Park Athletic Stadium, Tokyo (JPN)
2021LJ 5.67+1.2Jul 11, 2021Kamiyugi Park Athletic Stadium, Hachioji (JPN)
2021100m 12.88+1.2Jul 10, 2021Kamiyugi Park Athletic Stadium, Hachioji (JPN)
FAQ

Frequently asked questions

Marin Koseki's Long Jump personal best is 5.73, set on May 31, 2026 in Nihon University Stadium, Tokyo (JPN).

Marin Koseki competes in the Long Jump.

2026 season best: 5.73, set on May 31, 2026 in Nihon University Stadium, Tokyo (JPN). Last competition: The 8th Nihon University Competition on Oct 11, 2026, 5.42.