Judo’s Kosuke Mashiyama Switches to Team Mongolia — 5ch Says ‘Good Luck’

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The story

Kosuke Mashiyama (27), a former member of Japan’s national judo team, announced on his Instagram that he has acquired Mongolian citizenship and will aim for the World Championships and the Olympics as a member of Team Mongolia. His parents are both Japanese and he has no Mongolian roots, but he says the Mongolian Judo Federation gave him the opportunity. Under IJF rules, he won’t be eligible to compete for Mongolia until April of next year at the earliest. On 5ch, reactions were split — some cheered him on with comments like “good luck,” while others were harsher, saying things like “he’s taking a spot from a pure Mongolian athlete” or “isn’t this just switching because he couldn’t make Japan’s team?”

Daily Sports, 8/28

Former Japan judo national team member Kosuke Mashiyama announces switch to Team Mongolia after changing citizenship, “To become Olympic champion” — parents are Japanese, “I have no roots there, but the Mongolian federation gave me this opportunity”

Kosuke Mashiyama (27), a former member of Japan’s men’s national judo team, updated his Instagram on the 28th, announcing his intention to change citizenship and pursue the World Championships and the Olympics, stating, “I have decided to acquire Mongolian citizenship and challenge myself on the world stage as a member of Team Mongolia.” Due to IJF rules, he reportedly won’t be able to compete internationally for Mongolia until April of next year.

Source: daily.co.jp / Original article here

What people said

3AnonymousAug 28, 2026 22:38
Re: #1
Good luck. Doing it in Japan just isn't worth the effort (bad cost-performance).
4AnonymousAug 28, 2026 22:38
There are people who naturalize into Japan, so the reverse happens too.
Good luck to him.
5AnonymousAug 28, 2026 22:38
If he's from Chiyoda Ward, his family's probably loaded.
24AnonymousAug 28, 2026 22:48
Re: #5
Hmm, not sure about that.
Still a step up from Minato Ward though.
8AnonymousAug 28, 2026 22:39
With Murao and Tajima in his way, he probably just really wanted to make the Olympics no matter what.
14AnonymousAug 28, 2026 22:42
Would Japanese parents really give their kid a name written with those kanji (香補)? (an unusual spelling for 'Kosuke')
15AnonymousAug 28, 2026 22:43
I mean, why not? He should go wherever he's wanted and do his own thing.
16AnonymousAug 28, 2026 22:43
Ah, Mashiyama — the seoi-nage (shoulder throw) guy.
There's not much judo on TV these days so I've lost track of the athletes.
17AnonymousAug 28, 2026 22:43
Judo's a brutal world — miss weight once and you're done as a national team athlete.
19AnonymousAug 28, 2026 22:43
Can't get behind this — it takes an opportunity away from a purebred Mongolian athlete.
If he's going to do it, he needs to be prepared to live as a Mongolian, for Mongolia, for the rest of his life.
20AnonymousAug 28, 2026 22:43
I kind of had the image that Mongolia was strong at judo, though.
21AnonymousAug 28, 2026 22:44
They say making Japan's national team is actually harder than winning an Olympic gold medal…
22AnonymousAug 28, 2026 22:45
There was even a case of a Chinese pro wrestler posing as Mongolian.
72AnonymousAug 28, 2026 23:33
Re: #22
There was that guy from Croatia, Bepo Mongol or something like that.
23AnonymousAug 28, 2026 22:47
It's basically like Chinese players naturalizing elsewhere for table tennis.
25AnonymousAug 28, 2026 22:49
It's basically like Bahrain (recruiting foreign-born athletes), right?
Well, whatever — only second-tier athletes do that kind of thing anyway.
26AnonymousAug 28, 2026 22:49
His Mongolian name is Killer Khan II. (a nod to the famous Mongolian-gimmick wrestler)
53AnonymousAug 28, 2026 23:17
Re: #26
Well, if he's already planning ahead for a pro wrestling debut, maybe that actually makes sense.
28AnonymousAug 28, 2026 22:51
Sounds like the offer came from the Mongolian side, and it probably includes coaching and outreach work for the next generation too.
Doesn't seem like he's just leaving Japan because he wants to make the Olympics.
29AnonymousAug 28, 2026 22:51
Re: #1

Mongolia's actually pretty strong at judo, so I doubt he'll even make their Olympic team.

If you want to be an Olympic representative, you need to pick a weaker judo nation.
Also, he's underestimating what nationality actually means.
If he took Mongolian citizenship prepared to spend the rest of his life there, fine — but if not, he should drop it.
30AnonymousAug 28, 2026 22:51
If Mongolia puts its mind to it, they could get strong at judo too.
31AnonymousAug 28, 2026 22:54
Japan's a powerhouse, so let's start exporting some athletes too.
32AnonymousAug 28, 2026 22:54
Sounds like he's never made an Olympics, so he must want to compete no matter what two years from now. Given his age, that's probably his last shot too — hope he does it without regrets.
34AnonymousAug 28, 2026 22:55
Same pattern as Deguchi, huh.
Well, Deguchi actually had roots there, so that one made a bit more sense.
35AnonymousAug 28, 2026 22:56
Hakuho, Terunofuji, and plenty of others — we've taken plenty from them too, so fair's fair. (referring to Mongolian-born sumo stars who became Japanese)
36AnonymousAug 28, 2026 23:02
The logic doesn't add up.
To win Olympic gold you'd have to beat Japan's team anyway, so the odds are the same whether he competes for Japan or Mongolia.
I get it if he just wants to make the Olympics at all, though.
51AnonymousAug 28, 2026 23:13
Re: #36
At this point he's way behind his rivals in the race for Japan's team spot — probably no way to catch up.
37AnonymousAug 28, 2026 23:05
So he'll end up like those Chinese table tennis players… can't make the Olympics in the sport back home, so they switch citizenship to get in.
38AnonymousAug 28, 2026 23:06
Didn't realize there'd even been a weigh-in failure in Japanese men's judo.
41AnonymousAug 28, 2026 23:08
Well, Mongolians do well in sumo, so the reverse should be fine too.
42AnonymousAug 28, 2026 23:08
Let's just say his grandmother told him she carried the blood of Genghis Khan, so he felt a connection. (a sarcastic jab suggesting he needs a better cover story)
44AnonymousAug 28, 2026 23:09
In Mongolia, if you win an Olympic medal the state takes care of you for life.
Wonder if that applies to naturalized citizens too?
50AnonymousAug 28, 2026 23:12
Why is it that judo guys always end up with faces like Satoshi Ishii or Shohei Ono?

Background and Key Points

Switching nationality to chase an Olympic berth has precedent in sports like table tennis and sumo, and the IJF imposes a waiting period before newly switched athletes can compete, to keep the practice from being abused. That rule is presumably why Mashiyama can’t compete for Mongolia until April next year. Where the thread split was over whether to view this as taking a spot away from Mongolia’s judo community, or as a rational move given the gap in competitive depth between the two countries. Note that Japan does not generally recognize dual citizenship, so a change of nationality effectively amounts to naturalization. Mongolia has produced many sumo wrestlers, but its Olympic medal record in judo isn’t nearly as deep as Japan’s — it isn’t necessarily the “judo powerhouse” some might assume, a nuance the original article doesn’t really convey. Mashiyama has never competed in the Olympics, and given that he’s 27, some see the Games two years from now as effectively his last shot.

*This article is compiled from excerpts and a summary of the 5ch (Geinou/Sports Breaking News+) thread “Former Japan judo national team member Kosuke Mashiyama announces switch to Team Mongolia after citizenship change, “To become Olympic champion,” “I have no roots there, but the Mongolian federation gave me a shot”.”

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