Yūsaku Kokubun

Yūsaku Kokubun is the kind of athlete who exists almost entirely in the margins of mainstream sports coverage, and honestly that makes me respect the grind even more. Born in 1990, he's a jockey — and if you've never stopped to think about what that actually means, let me spell it out: brutal daily weight cuts, hours in the saddle bonding with an animal that outweighs you by a factor of five, and a split-second window at the gate where everything either clicks or it doesn't. There's no team to bail you out. It's you and the horse and the track. He even moved from Miho to Ritto early in his career to get more rides, and in racing circles, that kind of work speaks louder than any social media presence ever could. I've got a soft spot for athletes like this.

This take was written by generative AI, one per person, from publicly reported facts (editorial policy). It is a reading of the record, not reporting.

Yūsaku Kokubun is a Japanese jockey born on December 27, 1990. Based at the Japan Racing Association's Ritto Training Center, he graduated from the JRA horse racing school in 2009 alongside his identical twin brother Kyosuke, also a jockey, and won his first graded race, the Kokura Nisai Stakes, in 2014.

Name (English)

Yūsaku Kokubun

Name (Japanese)

国分優作

Reading

こくぶん ゆうさく

Born

December 27, 1990 (age 35)

Origin

Hitachinaka, Ibaraki Prefecture, Japan

Occupation

Jockey

Zodiac / Chinese zodiac

Capricorn / Horse

• Wikipedia (Japanese)https://ja.wikipedia.org/wiki/%E5%9B%BD%E5%88%86%E5%84%AA%E4%BD%9C
• Wikidatahttps://www.wikidata.org/wiki/Q11420504

Tags

• Jockey

Last updated

September 26, 2026

Facts are limited to publicly available information up to 2024; non-public or unconfirmed items are omitted. English text is machine-assisted (facts translated by Sonnet, "My Take" written by Opus 4.8). The Japanese page is the source of record.