Japan competed at the 2025 World Aquatics Championships in Singapore from July 11 to August 3, 2025.
Medalists Medal Name Sport Event Date Ichika Kajimoto Open water swimming Women's 3 km knockout sprints July 19 Kaho AitakaMoka FujiiMoe HigaYuka KawaseUta KobayashiTomoka SatoNao ShirahaseSakurako Uchida Artistic swimming Team free routine July 20 Ippei Watanabe Swimming Men's 200 metre breaststroke August 1 Tomoyuki Matsushita Swimming Men's 400 metre individual medley August 3 Mio Narita Swimming Women's 400 metre individual medley August 3 Ichika Kajimoto Open water swimming Women's 5 km July 18 Reo NishidaSho SakaiRin KanetoSayaka Mikami Diving Team event July 26 Tatsuya Murasa Swimming Men's 200 metre freestyle July 29
Competitors The following is the list of competitors in the Championships. SportMenWomenTotalArtistic swimming 0 9 9Diving 6 2 8Open water swimming 1 2 3Swimming 19 14 33Water polo 15 15 30Total 41 41 82
Artistic swimming
Women AthleteEventPreliminariesFinalPointsRankPointsRank Moe Higa Solo technical routine249.18336 Q251.21846 Moe HigaTomoka Sato Duet technical routine293.49504 Q295.62404 Uta KobayashiTomoka Sato Duet free routine255.90204 Q254.99177 Mixed AthleteEventPreliminariesFinalPointsRankPointsRank Kaho AitakaMoka FujiiMoe HigaYuka KawaseUta KobayashiHinata KumagaiTomoka SatoNao Shirahase Team technical routine 265.7967 6 Q 282.4134 4 Kaho AitakaMoka FujiiMoe HigaYuka KawaseUta KobayashiTomoka SatoNao ShirahaseSakurako Uchida Team free routine 327.9186 3 Q 334.7232 'Kaho AitakaMoka FujiiMoe HigaYuka KawaseUta KobayashiHinata KumagaiTomoka SatoSakurako Uchida Team acrobatic routine 191.0638 9 Q 193.0367 10 Diving
Men AthleteEventPreliminariesSemifinalsFinalPointsRankPointsRankPointsRankSenri Ikuma1 m springboardDid not startcolspan=2 Did not advanceReo Nishida10 m platform335.1034Did not advanceSho Sakai3 m springboard396.8010 Q395.7512 Q406.4511Haruki Suyama3 m springboard343.3039Did not advanceRikuto Tamai10 m platform466.603 Q480.203 Q492.556Senri IkumaHaruki Suyama3 m synchro springboard362.9111colspan=2 Did not advanceShu OhkuboRikuto Tamai10 m synchro platform373.387 Qcolspan=2 369.248 Women AthleteEventPreliminariesSemifinalsFinalPointsRankPointsRankPointsRankRin Kaneto10 m platform306.256 Q305.709 Q306.2010Sayaka Mikami3 m springboard283.7512 Q300.457 Q320.155
Mixed AthleteEventFinalPointsRankReo NishidaSho SakaiRin KanetoSayaka MikamiTeam event409.65 Open water swimming
Men AthleteEventHeatSemi-finalFinalTimeRankTimeRankTimeRank Riku Takaki Men's 3 km knockout sprints 18:46.6 27Did not advance Men's 5 km colspan=4 1:01:26.9 39 Men's 10 km colspan=4 2:09:18.8 34 Kaito Tsujimori Men's 3 km knockout sprints 17:16.6 13Did not advance Men's 5 km colspan=4 1:01:00.2 25 Men's 10 km colspan=4 2:01:47.9 11
Women AthleteEventHeatSemi-finalFinalTimeRankTimeRankTimeRank Ichika Kajimoto Women's 3 km knockout sprints 18:09.9 2 Q 12:09.7 2 Q 6:19.9 Women's 5 km colspan=4 1:02:28.9 Women's 10 km colspan=4 2:09:27.8 8
Swimming
Japan entered 32 swimmers.
Men AthleteEventHeatSemi-finalFinalTimeRankTimeRankTimeRank Yamato Fukasawa100 m breaststroke1:00.2318Did not advance200 m breaststroke2:10.839 Q2:08.454 Q2:09.216 Kazushi Imafuku400 m freestyle3:48.6919colspan=2 rowspan=2 Did not advance1500 m freestyle15:24.9815Did not advance Kosuke Makino200 m individual medley1:57.742 Q1:57.519 Q1:59.258 Katsuhiro Matsumoto50 m butterfly23.3419Did not advance100 m butterfly51.308 Q51.2011Did not advance Tomoyuki Matsushita200 m individual medley1:58.2810 Q1:57.114 Q1:57.526400 m individual medley4:10.391 Qcolspan=2 4:08.32 Riku Matsuyama50 m backstroke25.1129Did not advance100 m backstroke53.9421Did not advance Naoki Mizunuma100 m butterfly51.4414 Q50.969Did not advance Tatsuya Murasa200 m freestyle1:45.925 Q1:45.396 Q1:44.54 NR Akira Namba50 m freestyle22.4138Did not advanceAsaki Nishikawa400 m individual medley4:10.412 Qcolspan=2 4:10.214Kodai Nishiono200 m backstroke1:56.556 Q1:56.0411Did not advance So Ogata200 m butterfly1:55.379 Q1:55.4212Did not advance Hidekazu Takehara200 m backstroke1:57.2519Did not advance Taikan Tanaka50 m butterfly23.5831Did not advance Taku Taniguchi50 m breaststroke26.65 NR2 Q27.0716Did not advance100 m breaststroke59.7512 Q59.5914Did not advance Genki Terakado200 m butterfly1:54.646 Q1:55.3011Did not advance Ippei Watanabe200 m breaststroke2:08.412 Q2:08.011 Q2:07.70 Toshinari Yanagisawa50 m breaststroke27.2318Did not advance Masaki Yura50 m backstroke25.3538Did not advanceTatsuya Murasa Tomoyuki Matsushita So Ogata Asaki Nishikawa freestyle relay 7:09.17 10 colspan="2" Did not advanceRiku Matsuyama Taku TaniguchiNaoki Mizunuma Katsuhiro Matsumoto medley relay 3:34.36 13 colspan=2 Did not advance
Women AthleteEventHeatSemi-finalFinalTimeRankTimeRankTimeRank Reona Aoki100 m breaststroke1:07.1920Did not advance Yasuki Fujimoto200 m butterfly2:09.7012 Q2:10.2013Did not advance Mizuki Hirai50 m butterfly25.649 Q25.639Did not advance100 m butterfly56.814 Q56.867 Q56.837 Rikako Ikee50 m butterfly25.637 Q25.6711Did not advance100 m butterfly57.7513 Q57.8914Did not advance Nagisa Ikemoto100 m freestyle54.9025Did not advance200 m freestyle1:58.6118Did not advance Ichika Kajimoto400 m freestyle4:08.7912 colspan="2" rowspan=3 Did not advance800 m freestyle8:27.518 Q8:26.8581500 m freestyle16:09.6510Did not advance Kotomi Kato200 m breaststroke2:27.9122Did not advance Waka Kobori200 m freestyle1:59.0622Did not advance400 m individual medley4:36.624 Q colspan="2" 4:38.057 Shiho Matsumoto200 m individual medley2:10.948 Q2:11.6914Did not advance Miyu Namba400 m freestyle4:08.7211 colspan="2" Did not advance Mio Narita200 m backstroke2:11.5820Did not advance200 m individual medley2:10.877 Q2:09.163 Q2:09.565400 m individual medley4:37.126 Q colspan="2" 4:33.26Satomi Suzuki50 m breaststroke30.9121Did not advance100 m breaststroke1:06.133 Q1:06.126 Q1:05.784200 m breaststroke2:25.269 Q2:26.4414Did not advance Miki Takahashi50 m backstroke28.1220Did not advance Chiaki Yamamoto200 m backstroke2:12.6325Did not advanceNagisa Ikemoto Miyu Namba Waka Kobori Ichika Kajimoto freestyle relay 7:58.80 8 Q colspan="2" 7:58.13 8Miki Takahashi Satomi SuzukiMizuki Hirai Nagisa Ikemoto medley relay 3:56.85 5 Q colspan="2" 3:57.63 7
Mixed AthleteEventHeatFinalTimeRankTimeRankTatsuya Murasa Taikan Tanaka Nagisa Ikemoto Mizuki Hirai 4 × 100 m freestyle relay3:26.7714Did not advance Riku Matsuyama Taku TaniguchiiMizuki HiraiNagisa Ikemoto medley relay3:43.576 Q3:44.157 Water polo
Summary TeamEventGroup stagePlayoffQuarterfinalSemi-finalFinal / OppositionScoreOppositionScoreOppositionScoreRankOppositionScoreOppositionScoreOppositionScoreOppositionScoreRankMen's tournament L 16–22 L 18–23 W 12–11 3 P/Off L 14–21 W 22–11 W 20–19 9Women's tournament W 25–12 L 13–33 L 15–25 3 P/Off W 23–10 L 8–26 L 17–21 L 15–20 8 Men's tournament
Team roster
Group play
Playoffs
9th–12th place semifinals
Ninth place game
Women's tournament
Team roster
Group play
Playoffs
Quarterfinals
5-8th place semifinals
Fifth place game
References