By Retta Race on SwimSwam
101st JAPAN SWIM
Thursday, March 19th – Sunday, March 22nd Tokyo Aquatics Center LCM (50m) Meet Central SwimSwam Preview Day 1 Recap/Day 2 Recap Live ResultsWe already saw one World Junior Record fall on day three of the 2026 Japan Swim, with 17-year-old Shin Ohashi crushing a time of 2:06.59 in the men’s 200m breaststroke, but Yumeki Kojima also wanted to join the history-making party.
Racing in tonight’s 200m IM final, 17-year-old Kojima ripped a monster time of 1:56.53 to snag the silver behind Olympic medalist Tomoyuki Matsushita‘s gold medal-winning result of 1:56.71.
In doing so, Kojima overtook Hungarian Olympic champion Hubert Kos‘ longstanding WJR of 1:56.99 established at the 2021 European Championships.
Comparing the splits, Kojima was quicker on the backhalf, including a final 50m of 27.65.
Kos’ Old WJR – 1:56.99 Kojima’s New WJR – 1:56.53 24.74 25.37 29.16 29.03 35.05 34.48 28.04 27.65Entering this competition, Kojima’s lifetime best in this event rested at the 1:57.32 he produced for silver at the 2025 World Junior Championships. That performance rendered him Japan’s 9th-fastest man in history. His new 1:56.53 WJR, however, bumps him up significantly on that list to now rank 5th as he hacked nearly a second off that prior outing.
Top 5 Japanese LCM 200 IM Performers All-Time
Kosuke Hagino – 1:55.07, 2016 Daiya Seto – 1:55.55, 2020 Tomoyuki Matsushita – 1:55.60, 2025 Kosuke Makino – 1:55.85, 2025 Yumeki Kojima – 1:56.53, 2026Kojima already owns the 400m IM World Junior Record, courtesy of the 4:09.38 logged at a domestic meet last year.
The teen’s feat here checks him in as the #5 performer in the world at the moment. It also cleared the Japanese Swimming Federation (JASF) mandated selection standard of 1:57.23 needed to qualify for this year’s Pan Pacific Championships and Asian Games.
2025-2026 LCM Men 200 IM
HubertHUNKOS12/041:55.502Tomoyuki MatsushitaJPN1:55.6011/303Kosuke MakinoJPN1:55.8509/134Wang ShunCHN1:56.2011/145WilliamPetricAUS1:57.1812/16View Top 26»
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