Gensuke Sema

JapanJapanActive
Born
Apr 4, 2005 (21 years old)
Events
Half Marathon · 10 000 m

Gensuke Sema is a Japan middle-distance runner, born on April 4, 2005. He competes primarily in the 1500m, 3000m and 5000m.

His personal bests include 4:00.21 in the 1500m, 8:30.76 in the 3000m, 14:23.17 in the 5000m, 29:22.75 in the 10000m and 1:03:33 in the Semi. He is currently active on the international athletics circuit, representing Japan.

Personal best · Half Marathon1:03:33
2026 season best1:05:00Apr 5, 2026
2026 season best
Personal best · 10 000 m29:22.75
Last competitionThe Road of WASEDA/4th Waseda University track and field meetSep 27, 2026 · 13:55
The Road of WASEDA/4th Waseda University track and field meet

As of Nov 13, 2026: Half Marathon 1:03:33, 10 000 m 29:22.75, 2026 season best 1:05:00 (Apr 5, 2026) · Last competition: The Road of WASEDA/4th Waseda University track and field meet, Sep 27, 2026, 13:55 · 21 years old

Personal bests

WA points calculator →
DisciplineResultAll-time2026
1500mMaebashi 2021Japan 1500 m all-time list4:00.21852 pts––
3000mTokorozawa 2024Japan 3000 m all-time list8:30.76883 pts–#700
5000mYokohama 2022Japan 5000 m all-time list14:23.17924 pts––
10000mTokorozawa 2026Japan 10 000 m all-time list29:22.751,008 pts–#676
SemiAgeo 2025Japan Half Marathon all-time list1:03:331,048 pts––
5KilometreTokyo 202514:02–#206

Progression

SeasonDisciplineResultWindDateCompetitions
20261500m 3:55.61–Jul 5, 20263rd Waseda University track and field meet
20263000m 8:15.27–Jul 5, 20263rd Waseda University track and field meet
20265Kilometre 13:55–Sep 27, 2026The Road of WASEDA/4th Waseda University track and field meet
202610000m 29:22.75–Feb 14, 20269th Waseda University track and field meet
2026Semi 1:05:00–Apr 5, 2026Kanto Inter-University Track & Field Championships - Half Marathon, Utsunomiya
20255Kilometre 14:02–May 3, 2025Tokyo : Speed : Race
202510000m 31:03.00–Jul 20, 20252025 Summer Distance Challenge, Athletic Track, Abashiri
2025Semi 1:03:33–Nov 16, 2025Ageo City Half Marathon
FAQ

Frequently asked questions

Gensuke Sema's Half Marathon personal best is 1:03:33, set on Nov 16, 2025 in Ageo (JPN).

Gensuke Sema competes in the Half Marathon and 10 000 m.

2026 season best: 1:05:00, set on Apr 5, 2026. Last competition: The Road of WASEDA/4th Waseda University track and field meet on Sep 27, 2026, 13:55.