# Japan at the 2024 World Aquatics Championships

Japan competed at the 2024 World Aquatics Championships in Doha, Qatar from 2 to 18 February.

## Medalists

| Name | Sport | Event | Date |
| Tomoru Honda | Swimming | Men's 200 metre butterfly | 14 February 2024 |
| Moe Higa Moeka Kijima Uta Kobayashi Tomoka SatoAmi Wada Akane Yanagisawa Mashiro Yasunaga Megumu Yoshida | Artistic swimming | Team free routine | 9 February 2024 |
| Moe Higa Moeka Kijima Uta Kobayashi Tomoka SatoAyano Shimada Ami Wada Mashiro Yasunaga Megumu Yoshida | Artistic swimming | Team technical routine | 4 February 2024 |
| Daiya Seto | Swimming | Men's 400 metre individual medley | 18 February 2024 |

## Competitors

The following is the list of competitors in the Championships.
| Sport | Men | Women | Total |
| Artistic swimming | 0 | 10 | 10 |
| Diving | 5 | 5 | 10 |
| Open water swimming | 2 | 2* | 4* |
| Swimming | 9 | 3* | 12* |
| Water polo | 15 | 0 | 15 |
| Total | 31 | 19* | 50* |
Ichika Kajimoto competed in both open water swimming and pool swimming.

## Artistic swimming
### Women

| Athlete | Event | Preliminaries | Preliminaries | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Moe Higa Mashiro Yasunaga | Duet technical routine | Did not start | Did not start | Did not advance | Did not advance |

### Mixed

| Athlete | Event | Preliminaries | Preliminaries | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Moe Higa Moeka Kijima Uta Kobayashi Tomoka Sato Ayano Shimada Ami Wada Mashiro Yasunaga Megumu Yoshida | Team technical routine | 282.4379 | 2 Q | 275.8787 | |
| Moe Higa Moeka Kijima Uta Kobayashi Tomoka Sato Ami Wada Akane Yanagisawa Mashiro Yasunaga Megumu Yoshida | Team free routine | 319.4124 | 2 Q | 315.2229 | |
| Moka Fujii Moe Higa Tomoka Sato Ayano Shimada Ami Wada Akane Yanagisawa Mashiro Yasunaga Megumu Yoshida | Team acrobatic routine | 209.8801 | 8 Q | 206.7434 | 7 |

## Diving
### Men

| Athlete | Event | Preliminaries | Preliminaries | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Kai Kaneto | 1 m springboard | 290.55 | 23 | — | — | Did not advance | Did not advance |
| Kai Kaneto | 10 m platform | 261.30 | 39 | Did not advance | Did not advance | Did not advance | Did not advance |
| Sho Sakai | 3 m springboard | 383.50 | 12 Q | 393.25 | 8 Q | 414.60 | 9 |
| Haruki Suyama | 3 m springboard | 371.40 | 19 | Did not advance | Did not advance | Did not advance | Did not advance |
| Reo Nishida Shuta Yamada | 10 m synchro platform | — | — | — | — | 319.98 | 16 |

### Women

| Athlete | Event | Preliminaries | Preliminaries | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Matsuri Arai | 10 m platform | 253.20 | 23 | Did not advance | Did not advance | Did not advance | Did not advance |
| Haruka Enomoto | 3 m springboard | 258.50 | 14 Q | 282.40 | 8 Q | 265.20 | 11 |
| Rin Kaneto | 10 m platform | 279.75 | 15 Q | 271.10 | 13 | Did not advance | Did not advance |
| Sayaka Mikami | 3 m springboard | 279.45 | 7 Q | 258.70 | 13 | Did not advance | Did not advance |
| Matsuri Arai Minami Itahashi | 10 m synchro platform | — | — | — | — | 270.90 | 9 |

## Open water swimming
### Men

| Athlete | Event | Time | Rank |
| Kaiki Furuhata | Men's 10 km | 1:53:58.5 | 45 |
| Taishin Minamide | Men's 10 km | 1:49:57.2 | 25 |

### Women

| Athlete | Event | Time | Rank |
| [Airi Ebina]] | Women's 10 km | 1:57:35.5 | 11 |
| Ichika Kajimoto | Women's 10 km | 1:58:17.4 | 21 |

## Swimming

Japan entered 12 swimmers.

### Men

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Riki Abe | 200 metre individual medley | 1:59.48 | 4 Q | 1:59.60 | 10 | Did not advance | Did not advance |
| Ikuru Hiroshima | 200 metre breaststroke | 2:10.73 | 3 Q | 2:09.43 | 4 Q | 2:09.37 | 5 |
| Tomoru Honda | 100 metre butterfly | Did not start | Did not start | Did not advance | Did not advance | Did not advance | Did not advance |
| Tomoru Honda | 200 metre butterfly | 1:56.56 | 9 Q | 1:55.20 | 2 Q | 1:53.88 | |
| Tomoru Honda | 400 metre individual medley | Did not start | Did not start | — | — | Did not advance | Did not advance |
| Nao Horomura | 200 metre butterfly | 1:57.52 1:57.46 | 16 S/off 2 | Did not advance | Did not advance | Did not advance | Did not advance |
| Osamu Kato | 100 metre backstroke | 54.70 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |
| Osamu Kato | 200 metre backstroke | 1:58.82 | 13 Q | 1:58.97 | 15 | Did not advance | Did not advance |
| Katsuhiro Matsumoto | 200 metre freestyle | 1:46.84 | 8 Q | 1:46.53 | 10 | Did not advance | Did not advance |
| Katsuhiro Matsumoto | 100 metre butterfly | 51.60 | 2 Q | 51.85 | 9 | Did not advance | Did not advance |
| Daiya Seto | 200 metre individual medley | 1:58.26 | 2 Q | 1:57.85 | 4 Q | 1:57.54 | 4 |
| Daiya Seto | 400 metre individual medley | 4:13.06 | 3 Q | — | — | 4:12.51 | |
| Shinri Shioura | 50 metre freestyle | 22.22 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |
| Shinri Shioura | 50 metre butterfly | 24.16 | 31 | Did not advance | Did not advance | Did not advance | Did not advance |
| Shogo Takeda | 800 metre freestyle | 7:57.54 | 25 | — | — | Did not advance | Did not advance |
| Shogo Takeda | 1500 metre freestyle | 15:04.50 | 14 | — | — | Did not advance | Did not advance |
| Osamu Kato Ikuru Hiroshima Nao Horomura Riki Abe | 4 × 100 m medley relay | 3:39.91 | 20 | — | — | Did not advance | Did not advance |

### Women

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Chiharu Iitsuka | 50 metre butterfly | 26.85 | 24 | Did not advance | Did not advance | Did not advance | Did not advance |
| Chiharu Iitsuka | 100 metre butterfly | 58.35 | 7 Q | 58.01 | 7 Q | 58.23 | 8 |
| Nagisa Ikemoto | 50 metre freestyle | 25.65 | 28 | Did not advance | Did not advance | Did not advance | Did not advance |
| Nagisa Ikemoto | 100 metre freestyle | 54.70 | 10 Q | 54.76 | 13 | Did not advance | Did not advance |
| Nagisa Ikemoto | 200 metre freestyle | 2:00.11 | 21 | Did not advance | Did not advance | Did not advance | Did not advance |
| Nagisa Ikemoto | 100 metre butterfly | 58.73 | 11 Q | 58.61 | 11 | Did not advance | Did not advance |
| Ichika Kajimoto | 400 metre freestyle | 4:09.65 | 10 | — | — | Did not advance | Did not advance |
| Ichika Kajimoto | 800 metre freestyle | 8:35.25 | 8 Q | — | — | 8:29.24 | 6 |
| Ichika Kajimoto | 1500 metre freestyle | 16:27.96 | 13 | — | — | Did not advance | Did not advance |
| Ichika Kajimoto | 400 metre individual medley | 4:42.85 | 6 Q | — | — | 4:43.61 | 8 |

### Mixed

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Osamu Kato Ikuru Hiroshima Chiharu Iitsuka Nagisa Ikemoto | 4 × 100 m medley relay | 3:46.92 | 6 | — | — | 3:47.60 | 8 |

## Water polo
### Summary

| Team | Event | Group stage | Group stage | Group stage | Group stage | Playoff | Quarterfinal | Semifinal | Final / BM | Final / BM |
| Team | Event | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Japan | Men's tournament | Serbia L 10–17 | United States L 5–18 | Montenegro L 11–13 | 4 | — | — | Kazakhstan W 17–4 | Brazil W 22–11 | 13 |

### Men's tournament
#### Team roster

The following is the Japanese roster.
Head coach: Yoshinori Shiota
* 1 Katsuyuki Tanamura GK
* 2 Seiya Adachi FP
* 3 Taiyo Watanabe FP
* 4 Daichi Ogihara FP
* 5 Kai Inoue FP
* 6 Toi Suzuki FP
* 7 Kiyomu Date FP
* 8 Mitsuru Takata FP
* 9 Ikkei Nitta FP
* 10 Yusuke Inaba FP
* 11 Keigo Okawa FP
* 12 Kenta Araki FP
* 13 Towa Nishimura GK
* 14 Taiki Katayama FP
* 15 Ren Sasano FP

#### Group play

| Pos | Teamvte | Pld | W | PSW | PSL | L | GF | GA | GD | Pts | Qualification |
| 1 | Serbia | 3 | 3 | 0 | 0 | 0 | 45 | 28 | +17 | 9 | Quarterfinals |
| 2 | Montenegro | 3 | 1 | 1 | 0 | 1 | 30 | 36 | −6 | 5 | Playoffs |
| 3 | United States | 3 | 1 | 0 | 1 | 1 | 41 | 30 | +11 | 4 | Playoffs |
| 4 | Japan | 3 | 0 | 0 | 0 | 3 | 26 | 48 | −22 | 0 | 13–16th place semifinals |
| 5 February 2024 16:00 | Report | Japan | 10–17 | Serbia | Aspire Dome, Doha Referees: Georgios Stavridis (GRE), Andrej Franulović (CRO) |
| Aspire Dome, Doha Referees: Georgios Stavridis (GRE), Andrej Franulović (CRO) |||
| 5 February 2024 16:00 | Report | three players 2 | Goals | Jakšić 4 | Aspire Dome, Doha Referees: Georgios Stavridis (GRE), Andrej Franulović (CRO) |
| 7 February 2024 12:00 | Report | United States | 18–5 | Japan | Aspire Dome, Doha Referees: Xavi Buch (ESP), Sébastien Dervieux (FRA) |
| Aspire Dome, Doha Referees: Xavi Buch (ESP), Sébastien Dervieux (FRA) |||
| 7 February 2024 12:00 | Report | Hooper 6 | Goals | Ogihara 2 | Aspire Dome, Doha Referees: Xavi Buch (ESP), Sébastien Dervieux (FRA) |
| 9 February 2024 09:00 | Report | Montenegro | 13–11 | Japan | Aspire Dome, Doha Referees: Michiel Zwart (NED), Frank Ohme (GER) |
| Aspire Dome, Doha Referees: Michiel Zwart (NED), Frank Ohme (GER) |||
| 9 February 2024 09:00 | Report | Matković 4 | Goals | Watanabe 5 | Aspire Dome, Doha Referees: Michiel Zwart (NED), Frank Ohme (GER) |

#### 13–16th place semifinals

| 11 February 2024 10:30 | Report | Japan | 17–4 | Kazakhstan | Aspire Dome, Doha Referees: Natalia Markopoulou (GRE), Jennifer McCall (USA) |
| Aspire Dome, Doha Referees: Natalia Markopoulou (GRE), Jennifer McCall (USA) |||
| 11 February 2024 10:30 | Report | Inaba 3 | Goals | four players 1 | Aspire Dome, Doha Referees: Natalia Markopoulou (GRE), Jennifer McCall (USA) |

#### 13th place game

| 13 February 2024 10:30 | Report | Brazil | 11–22 | Japan | Aspire Dome, Doha Referees: Zhang Liang (CHN), Nóra Debreceni (HUN) |
| Aspire Dome, Doha Referees: Zhang Liang (CHN), Nóra Debreceni (HUN) |||
| 13 February 2024 10:30 | Report | R. Real 3 | Goals | Inaba 7 | Aspire Dome, Doha Referees: Zhang Liang (CHN), Nóra Debreceni (HUN) |