# Japan at the 2017 World Aquatics Championships

Japan competed at the 2017 World Aquatics Championships in Budapest, Hungary from 14 July to 30 July.

## Medalists

| Medal | Name | Sport | Event | Date |
| Silver | Yui Ohashi | Swimming | Women's 200 m individual medley | July 24 |
| Silver | Kosuke Hagino | Swimming | Men's 200 m individual medley | July 27 |
| Silver | Yasuhiro Koseki | Swimming | Men's 200 m breaststroke | July 28 |
| Silver | Junya Koga | Swimming | Men's 50 m backstroke | July 30 |
| Bronze | Sakiko Akutsu Juka Fukumura Aiko Hayashi Yukiko Inui Minami Kono Kei Marumo Kanami Nakamaki Mai Nakamura Kano Omata Asuka Tasaki | Synchronized swimming | Women's team technical routine | July 18 |
| Bronze | Sakiko Akutsu Juka Fukumura Aiko Hayashi Yukiko Inui Minami Kono Kei Marumo Kanami Nakamaki Mai Nakamura Kano Omata Yuriko Osawa Asuka Tasaki Maiko Yamazaki | Synchronized swimming | Women's free routine combination | July 22 |
| Bronze | Daiya Seto | Swimming | Men's 200 m butterfly | July 26 |
| Bronze | Ippei Watanabe | Swimming | Men's 200 m breaststroke | July 28 |
| Bronze | Daiya Seto | Swimming | Men's 400 m individual medley | July 30 |

## Diving

Japan has entered 5 divers (two male and three female).

### Men

| Athlete | Event | Preliminaries | Preliminaries | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Sho Sakai | 3 m springboard | 445.65 | 6 Q | 407.80 | 13 | did not advance | did not advance |
| Kazuki Murakami | 10 m platform | 349.70 | 28 | did not advance | did not advance | did not advance | did not advance |

### Women

| Athlete | Event | Preliminaries | Preliminaries | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Minami Itahashi | 10 m platform | 304.00 | 15 Q | 313.70 | 12 Q | 357.85 | 7 |
| Nana Sasaki | 10 m platform | 274.80 | 24 | did not advance | did not advance | did not advance | did not advance |
| Matsuri Arai Nana Sasaki | 10 m synchronized platform | 280.44 | 10 Q | — | — | 283.32 | 10 |

### Mixed

| Athlete | Event | Final | Final |
| Athlete | Event | Points | Rank |
| Minami Itahashi Kazuki Murakami | 10 m synchronized platform | 307.74 | 6 |

## Open water swimming

Japan has entered six open water swimmers
| Athlete | Event | Time | Rank |
| Yasunari Hirai | Men's 5 km | 55:33.3 | 33 |
| Yasunari Hirai | Men's 10 km | 1:54:52.9 | 40 |
| Yohsuke Miyamoto | Men's 5 km | 55:38.0 | 34 |
| Yohsuke Miyamoto | Men's 25 km | 5:11:32.1 | 15 |
| Taiki Nonaka | Men's 10 km | 1:55:14.1 | 44 |
| Taiki Nonaka | Men's 25 km | 5:13:35.5 | 19 |
| Yumi Kida | Women's 10 km | 2:03:06.6 | 23 |
| Yumi Kida | Women's 25 km | 5:39:31.5 | 15 |
| Yukimi Moriyama | Women's 5 km | 1:01:14.5 | 21 |
| Yukimi Moriyama | Women's 10 km | 2:02:13.3 | 20 |
| Minami Niikura | Women's 5 km | 1:00:55.0 | 16 |
| Yukimi Moriyama Minami Niikura Yasunari Hirai Yohsuke Miyamoto | Mixed team | 55:54.0 | 9 |

## Swimming

Japanese swimmers have achieved qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the A-standard entry time, and 1 at the B-standard):

### Men

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Naito Ehara | 200 m freestyle | 1:47.31 | 15 Q | 1:47.36 | 15 | did not advance | did not advance |
| Kosuke Hagino | 200 m backstroke | 1:57.97 | 12 Q | 1:58.72 | 14 | did not advance | did not advance |
| Kosuke Hagino | 200 m individual medley | 1:56.46 | 1 Q | 1:56.04 | 2 Q | 1:56.01 | |
| Kosuke Hagino | 400 m individual medley | 4:14.15 | 7 Q | — | — | 4:12.65 | 6 |
| Ryosuke Irie | 100 m backstroke | 53.54 | 5 Q | 53.02 | 4 Q | 53.03 | 4 |
| Ryosuke Irie | 200 m backstroke | 1:57.21 | 6 Q | 1:55.79 | 6 Q | 1:56.35 | 7 |
| Yuki Kobori | 100 m butterfly | 52.17 | 20 | did not advance | did not advance | did not advance | did not advance |
| Junya Koga | 50 m backstroke | 24.54 | 1 Q | 24.44 | 2 Q | 24.51 | |
| Yasuhiro Koseki | 50 m breaststroke | 27.21 AS | 10 Q | 27.17 AS | 11 | did not advance | did not advance |
| Yasuhiro Koseki | 100 m breaststroke | 59.76 | 11 Q | 59.18 | 6 Q | 59.10 | 4 |
| Yasuhiro Koseki | 200 m breaststroke | 2:10.38 | 12 Q | 2:07.80 | 4 Q | 2:07.29 | |
| Katsuhiro Matsumoto | 200 m freestyle | 1:47.92 | 27 | did not advance | did not advance | did not advance | did not advance |
| Katsumi Nakamura | 50 m freestyle | 22.32 | 23 | did not advance | did not advance | did not advance | did not advance |
| Katsumi Nakamura | 100 m freestyle | 49.10 | 28 | did not advance | did not advance | did not advance | did not advance |
| Masato Sakai | 200 m butterfly | 1:55.94 | 6 Q | 1:55.57 | 7 Q | 1:55.04 | 6 |
| Daiya Seto | 200 m butterfly | 1:54.89 | 2 Q | 1:54.03 | 1 Q | 1:54.21 | |
| Daiya Seto | 200 m individual medley | 1:57.55 | 4 Q | 1:56.92 | 5 Q | 1:56.97 | 5 |
| Daiya Seto | 400 m individual medley | 4:12.89 | 4 Q | — | — | 4:09.14 | |
| Shinri Shioura | 50 m freestyle | 22.17 | 15 Q | 22.02 | 14 | did not advance | did not advance |
| Shinri Shioura | 100 m freestyle | 48.46 | =5 Q | 48.54 | 11 | did not advance | did not advance |
| Ippei Watanabe | 100 m breaststroke | 1:00.26 | 22 | did not advance | did not advance | did not advance | did not advance |
| Ippei Watanabe | 200 m breaststroke | 2:09.30 | 3 Q | 2:07.44 | 2 Q | 2:07.47 | |
| Junya Koga Katsuhiro Matsumoto Katsumi Nakamura Shinri Shioura | 4×100 m freestyle relay | 3:14.82 | 7 Q | — | — | 3:13.65 | 5 |
| Tsubasa Amai Naito Ehara Kosuke Hagino Katsuhiro Matsumoto | 4×200 m freestyle relay | 7:09.66 | 6 Q | — | — | 7:07.68 | 5 |
| Ryosuke Irie Yuki Kobori Yasuhiro Koseki Shinri Shioura | 4×100 m medley relay | 3:31.63 | 2 Q | — | — | 3:30.19 AS | 4 |

### Women

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Reona Aoki | 100 m breaststroke | 1:07.48 | 17 q | 1:07.43 | 14 | did not advance | did not advance |
| Reona Aoki | 200 m breaststroke | 2:25.93 | 12 Q | 2:24.42 | 10 | did not advance | did not advance |
| Tomomi Aoki | 100 m freestyle | 1:59.44 | 23 | did not advance | did not advance | did not advance | did not advance |
| Suzuka Hasegawa | 200 m butterfly | 2:09.10 | 12 Q | 2:07.01 | 4 Q | 2:07.43 | 6 |
| Chihiro Igarashi | 200 m freestyle | 1:57.67 | 11 Q | 1:57.96 | 13 | did not advance | did not advance |
| Rikako Ikee | 50 m freestyle | 25.04 | 16 Q | 24.94 | 16 | did not advance | did not advance |
| Rikako Ikee | 100 m freestyle | 54.91 | 21 | did not advance | did not advance | did not advance | did not advance |
| Rikako Ikee | 50 m butterfly | 25.72 | 3 Q | 25.90 | 13 | did not advance | did not advance |
| Rikako Ikee | 100 m butterfly | 57.45 | 4 Q | 56.89 | 4 Q | 57.08 | 6 |
| Runa Imai | 200 m individual medley | 2:11.15 | 5 Q | 2:10.15 | 7 Q | 2:09.99 | 5 |
| Hiroko Makino | 200 m butterfly | 2:09.14 | 15 Q | 2:07.95 | 10 | did not advance | did not advance |
| Yui Ohashi | 200 m individual medley | 2:11.44 | 8 Q | 2:10.45 | 8 Q | 2:07.91 NR | |
| Yui Ohashi | 400 m individual medley | 4:36.97 | 7 Q | — | — | 4:34.50 | 4 |
| Sakiko Shimizu | 400 m individual medley | 4:36.43 | 5 Q | — | — | 4:35.62 | 5 |
| Satomi Suzuki | 50 m breaststroke | 30.95 | 14 Q | 30.95 | 13 | did not advance | did not advance |
| Satomi Suzuki | 100 m breaststroke | 1:07.20 | =10 Q | 1:07.08 | 11 | did not advance | did not advance |
| Satomi Suzuki | 200 m breaststroke | 2:26.78 | 15 Q | 2:25.60 | 12 | did not advance | did not advance |
| Tomomi Aoki Chihiro Igarashi Rikako Ikee Yui Yamane | 4×100 m freestyle relay | 3:37.46 | 7 Q | — | — | 3:38.24 | 7 |
| Tomomi Aoki Chihiro Igarashi Rikako Ikee Aya Takano | 4×200 m freestyle relay | 7:53.67 | 2 Q | — | — | 7:50.43 | 5 |

### Mixed

| Athlete | Event | Heat | Heat | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank |
| Katsuhiro Matsumoto Katsumi Nakamura Tomomi Aoki* Rikako Ikee Shinri Shioura | 4×100 m freestyle relay | 3:26.91 AS | 6 Q | 3:24.78 AS | 4 |
| Runa Imai Sakiko Shimizu Tsubasa Amai Junya Koga | 4×100 m medley relay | 3:53.79 | 10 | did not advance | did not advance |

## Synchronized swimming

Japan's synchronized swimming team consisted of 14 athletes (1 male and 13 female).

### Women

| Athlete | Event | Preliminaries | Preliminaries | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Yukiko Inui | Solo technical routine | 90.8837 | 3 Q | 91.7490 | 4 |
| Yukiko Inui | Solo free routine | 91.9667 | 4 Q | 92.0667 | 4 |
| Yukiko Inui Mai Nakamura Kanami Nakamaki (R) | Duet technical routine | 90.1304 | 4 Q | 92.0572 | 4 |
| Yukiko Inui Kanami Nakamaki Mai Nakamura (R) | Duet free routine | 92.6000 | 4 Q | 93.1333 | 4 |
| Sakiko Akutsu Juka Fukumura Aiko Hayashi (R) Yukiko Inui Minami Kono Kei Marumo Kanami Nakamaki Mai Nakamura Kano Omata Asuka Tasaki (R) | Team technical routine | 91.7484 | 3 Q | 93.1590 | |
| Sakiko Akutsu Juka Fukumura Aiko Hayashi Yukiko Inui Minami Kono (R) Kei Marumo Kanami Nakamaki Mai Nakamura Kano Omata Asuka Tasaki (R) | Team free routine | 92.4667 | 4 Q | 93.1000 | 4 |
| Sakiko Akutsu Juka Fukumura Aiko Hayashi (R) Yukiko Inui Minami Kono Kei Marumo Kanami Nakamaki Mai Nakamura Kano Omata Yuriko Osawa Asuka Tasaki Maiko Yamazaki (R) | Free routine combination | 92.9667 | 3 Q | 93.2000 | |

### Mixed

| Athlete | Event | Preliminaries | Preliminaries | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Atsushi Abe Yumi Adachi | Duet technical routine | 84.8153 | 4 Q | 86.2679 | 4 |
| Atsushi Abe Yumi Adachi | Duet free routine | 86.9333 | 4 Q | 88.0000 | 4 |
Legend: (R) = Reserve Athlete

## Water polo

Japan qualified both a men's and women's teams.

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

* Katsuyuki Tanamura
* Seiya Adachi
* Shuma Kawamoto
* Mitsuaki Shiga
* Takuma Yoshida
* Atsuto Iida
* Yusuke Shimizu (C)
* Mitsuru Takata
* Atsushi Arai
* Kohei Inaba
* Keigo Okawa
* Kenya Araki
* Tomoyoshi Fukushima

#### Group play

| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Croatia | 3 | 3 | 0 | 0 | 38 | 21 | +17 | 6 | Quarterfinals |
| 2 | Russia | 3 | 1 | 0 | 2 | 34 | 32 | +2 | 2 | Playoffs |
| 3 | Japan | 3 | 1 | 0 | 2 | 29 | 38 | −9 | 2 | Playoffs |
| 4 | United States | 3 | 1 | 0 | 2 | 28 | 38 | −10 | 2 | |
* 1 2 3 Russia 2 Pts, +4 GD; Japan 2 Pts, +1 GD; United States 2 Pts, −5 GD
| 17 July 2017 21:30 | Report | Japan | 8–15 | Russia | Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Stanko Ivanovski (MNE) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Stanko Ivanovski (MNE) |||
| 17 July 2017 21:30 | Report | three players 2 | Goals | four players 3 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Stanko Ivanovski (MNE) |
| 19 July 2017 17:30 | Report | United States | 7–15 | Japan | Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Benjamin Mercier (FRA) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Benjamin Mercier (FRA) |||
| 19 July 2017 17:30 | Report | Dunstan, Hallock 2 | Goals | Adachi 7 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Benjamin Mercier (FRA) |
| 21 July 2017 13:30 | Report | Japan | 6–16 | Croatia | Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Benjamin Mercier (FRA) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Benjamin Mercier (FRA) |||
| 21 July 2017 13:30 | Report | Arai 2 | Goals | four players 3 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Flahive (AUS), Benjamin Mercier (FRA) |

#### Playoffs

| 23 July 2017 20:30 | Report | Greece | 14–4 | Japan | Alfréd Hajós National Swimming Stadium, Budapest Referees: Frank Ohme (GER), Steven Rotsart (USA) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Frank Ohme (GER), Steven Rotsart (USA) |||
| 23 July 2017 20:30 | Report | Fountoulis 4 | Goals | Adachi 2 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Frank Ohme (GER), Steven Rotsart (USA) |

#### 9th–12th place semifinals

| 25 July 2017 12:10 | Report | Brazil | 7–9 | Japan | Alfréd Hajós National Swimming Stadium, Budapest Referees: Diana Dutilh-Dumas (NED), Radosław Koryzna (POL) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Diana Dutilh-Dumas (NED), Radosław Koryzna (POL) |||
| 25 July 2017 12:10 | Report | Coutinho, Freitas 2 | Goals | Adachi 3 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Diana Dutilh-Dumas (NED), Radosław Koryzna (POL) |

#### Ninth place game

| 27 July 2017 12:00 | Report | Japan | 11–13 | Spain | Alfréd Hajós National Swimming Stadium, Budapest Referees: Stanko Ivanovski (MNE), Viktor Salnichenko (KAZ) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Stanko Ivanovski (MNE), Viktor Salnichenko (KAZ) |||
| 27 July 2017 12:00 | Report | Adachi, Okawa 3 | Goals | Español 5 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Stanko Ivanovski (MNE), Viktor Salnichenko (KAZ) |

### Women's tournament
#### Team roster

* Miyuu Aoki
* Yumi Arima
* Yuri Kazama
* Shino Magariyama
* Chiaki Sakanoue
* Minori Yamamoto
* Akari Inaba
* Yuki Niizawa
* Kana Hosoya
* Misaki Noro
* Marina Tokumoto
* Kotori Suzuki (C)
* Minami Shioya

#### Group play

| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Hungary (H) | 3 | 3 | 0 | 0 | 54 | 24 | +30 | 6 | Quarterfinals |
| 2 | Netherlands | 3 | 2 | 0 | 1 | 45 | 20 | +25 | 4 | Playoffs |
| 3 | France | 3 | 1 | 0 | 2 | 16 | 49 | −33 | 2 | Playoffs |
| 4 | Japan | 3 | 0 | 0 | 3 | 27 | 49 | −22 | 0 | |
| 16 July 2017 20:10 | Report | Japan | 11–20 | Hungary | Alfréd Hajós National Swimming Stadium, Budapest Referees: Steven Rotsart (USA), Alessandro Severo (ITA) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Steven Rotsart (USA), Alessandro Severo (ITA) |||
| 16 July 2017 20:10 | Report | Arima, Yamamoto 4 | Goals | Bujka 5 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Steven Rotsart (USA), Alessandro Severo (ITA) |
| 18 July 2017 12:10 | Report | Japan | 8–20 | Netherlands | Alfréd Hajós National Swimming Stadium, Budapest Referees: Mikhail Dykman (CAN), Michael Brooks (NZL) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Mikhail Dykman (CAN), Michael Brooks (NZL) |||
| 18 July 2017 12:10 | Report | Arima 3 | Goals | Van der Sloot 6 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Mikhail Dykman (CAN), Michael Brooks (NZL) |
| 20 July 2017 09:30 | Report | Japan | 8–9 | France | Alfréd Hajós National Swimming Stadium, Budapest Referees: Radoslaw Koryzna (POL), Francesc Buch (ESP) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Radoslaw Koryzna (POL), Francesc Buch (ESP) |||
| 20 July 2017 09:30 | Report | Inaba 3 | Goals | Millot 4 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Radoslaw Koryzna (POL), Francesc Buch (ESP) |

#### 13th–16th place semifinals

| 22 July 2017 12:00 | Report | Japan | 17–8 | Kazakhstan | Alfréd Hajós National Swimming Stadium, Budapest Referees: Diego Garibaldi (ARG), Michael Brooks (NZL) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Diego Garibaldi (ARG), Michael Brooks (NZL) |||
| 22 July 2017 12:00 | Report | Arima, Sakanoue 4 | Goals | Mirshina 4 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Diego Garibaldi (ARG), Michael Brooks (NZL) |

#### 13th place game

| 24 July 2017 10:50 | Report | Brazil | 9–11 | Japan | Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Daners (URU), Dion Willis (RSA) |
| Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Daners (URU), Dion Willis (RSA) |||
| 24 July 2017 10:50 | Report | Abla 4 | Goals | Sakanoue 4 | Alfréd Hajós National Swimming Stadium, Budapest Referees: Daniel Daners (URU), Dion Willis (RSA) |