Ten Koizumi

JapanJapanActive
Born
Aug 20, 2005 (21 years old)
Events
Half Marathon

Ten Koizumi is a Japan long-distance runner, born on August 20, 2005. He competes primarily in the Semi and 5000m-short-track.

His personal bests include 1:10:20 in the Semi and 22:29.21 in the 5000m-short-track. He is currently active on the international athletics circuit, representing Japan.

Personal best · Half Marathon1:10:20
2026 season best1:09:50Oct 17, 2026
2026 season best
Last competitionThe 103rd Hakone Ekiden Qualifying MeetOct 17, 2026 · 1:09:50
The 103rd Hakone Ekiden Qualifying Meet

As of Nov 13, 2026: Half Marathon 1:10:20, 2026 season best 1:09:50 (Oct 17, 2026) · Last competition: The 103rd Hakone Ekiden Qualifying Meet, Oct 17, 2026, 1:09:50 · 21 years old

Personal bests

WA points calculator →
DisciplineResultAll-time
SemiTachikawa 2025Japan Half Marathon all-time list1:10:20807 pts–
5000m-short-trackSapporo 202322:29.2124 pts–

Progression

SeasonDisciplineResultWindDateCompetitions
2026Semi 1:09:50–Oct 17, 2026The 103rd Hakone Ekiden Qualifying Meet
2025Semi 1:10:20–Oct 18, 2025The 102nd Hakone Ekiden Qualifying Meet, Showa Kinen Park, Tachikawa
20235000m-short-track 22:29.21–Aug 3, 2023Inter-High School Championships, Atsubetsu Park Stadium, Sapporo
FAQ

Frequently asked questions

Ten Koizumi's Half Marathon personal best is 1:10:20, set on Oct 18, 2025 in Showa Kinen Park, Tachikawa (JPN).

Ten Koizumi competes in the Half Marathon.

2026 season best: 1:09:50, set on Oct 17, 2026. Last competition: The 103rd Hakone Ekiden Qualifying Meet on Oct 17, 2026, 1:09:50.