# Japan at the 2015 World Aquatics Championships

Japan competed at the 2015 World Aquatics Championships in Kazan, Russia from 24 July to 9 August 2015.

## Medalists

| Medal | Name | Sport | Event | Date |
| Gold | Natsumi Hoshi | Swimming | Women's 200 m butterfly | August 6 |
| Gold | Kanako Watanabe | Swimming | Women's 200 m breaststroke | August 7 |
| Gold | Daiya Seto | Swimming | Men's 400 m individual medley | August 9 |
| Silver | Kanako Watanabe | Swimming | Women's 200 m individual medley | August 3 |
| Bronze | Yukiko Inui Risako Mitsui | Synchronized swimming | Duet technical routine | July 26 |
| Bronze | Aika Hakoyama Yukiko Inui Kei Marumo Risako Mitsui Kanami Nakamaki Mai Nakamura Kano Omata Kurumi Yoshida | Synchronized swimming | Team technical routine | July 27 |
| Bronze | Aika Hakoyama Aiko Hayashi Yukiko Inui Kei Marumo Risako Mitsui Kanami Nakamaki Mai Nakamura Kurumi Yoshida | Synchronized swimming | Team free routine | July 31 |
| Bronze | Aika Hakoyama Aiko Hayashi Yukiko Inui Kei Marumo Risako Mitsui Kanami Nakamaki Mai Nakamura Kano Omata Asuka Tasaki Kurumi Yoshida | Synchronized swimming | Free routine combination | August 1 |

## Diving

Japanese divers qualified for the individual spots and the synchronized teams at the World Championships.

### Men

| Athlete | Event | Preliminaries | Preliminaries | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Sho Sakai | 3 m springboard | 411.10 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |
| Ken Terauchi | 3 m springboard | 440.25 | 9 Q | 463.25 | 10 Q | 468.15 | 9 |
| Takuma Hagita | 10 m platform | 290.70 | 44 | Did not advance | Did not advance | Did not advance | Did not advance |
| Yu Okamoto | 10 m platform | 402.10 | 21 | Did not advance | Did not advance | Did not advance | Did not advance |
| Sho Sakai Ken Terauchi | 3 m synchronized springboard | 394.50 | 9 Q | — | — | 389.94 | 11 |

### Women

| Athlete | Event | Preliminaries | Preliminaries | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Minami Itahashi | 3 m springboard | 235.50 | 35 | Did not advance | Did not advance | Did not advance | Did not advance |
| Sayaka Shibusawa | 3 m springboard | 289.75 | 14 Q | 288.45 | 14 | Did not advance | Did not advance |
| Minami Itahashi | 10 m platform | 344.65 | 6 Q | 305.30 | 16 | Did not advance | Did not advance |
| Nana Sasaki | 10 m platform | 255.10 | 31 | Did not advance | Did not advance | Did not advance | Did not advance |

### Mixed

| Athlete | Event | Final | Final |
| Athlete | Event | Points | Rank |
| Yu Okamoto Minami Itahashi | 10 m synchronized platform | 289.92 | 9 |

## Open water swimming

Japan has fielded a team of four swimmers to compete in the open water marathon. Among the official roster are 2012 Olympians Yasunari Hirai and Yumi Kida.
| Athlete | Event | Time | Rank |
| Yasunari Hirai | Men's 10 km | 1:50:28.3 | 11 |
| Yōsuke Miyamoto | Men's 10 km | 1:52:06.7 | 35 |
| Yumi Kida | Women's 10 km | 2:00:01.8 | 28 |

## 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): Swimmers must qualify at the 2015 Japanese Championships (for pool events) to confirm their places at the Worlds.
Twenty-four swimmers have been officially nominated to the Japanese team to compete in the Worlds, including defending champion Daiya Seto in the 400 m individual medley and Olympic medalists Ryosuke Irie, Ryo Tateishi, and Natsumi Hoshi. Japan's rising superstar Kosuke Hagino was set to compete, but later withdrew from the team due to elbow fracture.

### Men

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Tsubasa Amai | 200 m freestyle | 1:50.04 | 40 | Did not advance | Did not advance | Did not advance | Did not advance |
| Tsubasa Amai | 400 m freestyle | 3:52.06 | 35 | — | — | Did not advance | Did not advance |
| Takuro Fujii | 100 m butterfly | 51.76 | 6 Q | 51.58 | 9 | Did not advance | Did not advance |
| Ryosuke Irie | 100 m backstroke | 53.37 | 5 Q | 53.13 | 4 Q | 53.10 | 6 |
| Ryosuke Irie | 200 m backstroke | 1:56.68 | 2 Q | 1:55.76 | 5 Q | 1:54.81 | 4 |
| Masaki Kaneko | 50 m backstroke | 25.49 | 23 | Did not advance | Did not advance | Did not advance | Did not advance |
| Masaki Kaneko | 100 m backstroke | 54.19 | 17 | Did not advance | Did not advance | Did not advance | Did not advance |
| Masaki Kaneko | 200 m backstroke | 1:57.63 | 9 Q | 1:57.33 | 10 | Did not advance | Did not advance |
| Takeshi Kawamoto | 50 m butterfly | 23.61 | 13 Q | 23.74 | 16 | Did not advance | Did not advance |
| Takeshi Kawamoto | 100 m butterfly | 52.41 | 21 | Did not advance | Did not advance | Did not advance | Did not advance |
| Yuki Kobori | 200 m freestyle | 1:48.09 | 18 | Did not advance | Did not advance | Did not advance | Did not advance |
| Yasuhiro Koseki | 50 m breaststroke | 28.13 | 30 | Did not advance | Did not advance | Did not advance | Did not advance |
| Yasuhiro Koseki | 100 m breaststroke | 59.93 | 10 Q | 1:00.31 | 14 | Did not advance | Did not advance |
| Yasuhiro Koseki | 200 m breaststroke | 2:10.47 | 13 Q | 2:08.03 | 1 Q | 2:09.12 | 5 |
| Katsumi Nakamura | 50 m freestyle | 22.25 | 10 Q | 22.15 | 13 | Did not advance | Did not advance |
| Katsumi Nakamura | 100 m freestyle | 49.07 | 19 | Did not advance | Did not advance | Did not advance | Did not advance |
| Masato Sakai | 200 m butterfly | 1:55.97 | 7 Q | 1:54.75 | 3 Q | 1:54.24 | 4 |
| Daiya Seto | 200 m butterfly | 1:55.60 | 3 Q | 1:54.95 | 5 Q | 1:55.15 | 6 |
| Daiya Seto | 200 m individual medley | 1:59.11 | 7 Q | 2:00.05 | 14 | Did not advance | Did not advance |
| Daiya Seto | 400 m individual medley | 4:12.17 | 3 Q | — | — | 4:08.50 | |
| Shinri Shioura | 50 m freestyle | 22.34 | 12 Q | 22.08 | 11 | Did not advance | Did not advance |
| Shinri Shioura | 100 m freestyle | 48.84 | 14 Q | 48.96 | 15 | Did not advance | Did not advance |
| Ryo Tateishi | 100 m breaststroke | 1:01.26 | 29 | Did not advance | Did not advance | Did not advance | Did not advance |
| Ryo Tateishi | 200 m breaststroke | 2:13.23 | 25 | Did not advance | Did not advance | Did not advance | Did not advance |
| Katsumi Nakamura Shinri Shioura Yuki Kobori Takuro Fujii | 4×100 m freestyle relay | 3:14.76 | 5 Q | — | — | 3:15.04 | 6 |
| Yuki Kobori Tsubasa Amai Naito Ehara Daiya Seto | 4×200 m freestyle relay | 7:11.59 | 10 | — | — | Did not advance | Did not advance |
| Takuro Fujii Ryosuke Irie Yasuhiro Koseki Shinri Shioura | 4×100 m medley relay | 3:32.82 | 4 Q | — | — | 3:31.10 | 6 |

### Women

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Sayaka Akase | 100 m backstroke | 1:01.62 | =29 | Did not advance | Did not advance | Did not advance | Did not advance |
| Natsumi Hoshi | 100 m butterfly | 58.47 | 15 Q | 58.45 | 14 | Did not advance | Did not advance |
| Natsumi Hoshi | 200 m butterfly | 2:07.97 | 5 Q | 2:06.36 | 1 Q | 2:05.56 | |
| Chihiro Igarashi | 200 m freestyle | 1:58.31 | =13 Q | 1:57.75 | 11 | Did not advance | Did not advance |
| Chihiro Igarashi | 400 m freestyle | 4:13.43 | 20 | — | — | Did not advance | Did not advance |
| Chihiro Igarashi | 400 m individual medley | 4:43.06 | 16 | — | — | Did not advance | Did not advance |
| Rikako Ikee | 50 m butterfly | 26.66 | 19 | Did not advance | Did not advance | Did not advance | Did not advance |
| Rie Kaneto | 50 m breaststroke | 31.99 | 31 | Did not advance | Did not advance | Did not advance | Did not advance |
| Rie Kaneto | 100 m breaststroke | 1:07.71 | 18 | Did not advance | Did not advance | Did not advance | Did not advance |
| Rie Kaneto | 200 m breaststroke | 2:25.75 | 15 Q | 2:22.88 | 6 Q | 2:23.19 | 6 |
| Yayoi Matsumoto | 50 m freestyle | 25.90 | 38 | Did not advance | Did not advance | Did not advance | Did not advance |
| Yayoi Matsumoto | 100 m freestyle | 55.71 | 32 | Did not advance | Did not advance | Did not advance | Did not advance |
| Sachi Mochida | 200 m freestyle | 1:59.35 | 20 | Did not advance | Did not advance | Did not advance | Did not advance |
| Sakiko Shimizu | 200 m individual medley | 2:12.27 | 8 Q | 2:11.53 | 10 | Did not advance | Did not advance |
| Sakiko Shimizu | 400 m individual medley | 4:36.16 | 6 Q | — | — | 4:37.19 | 6 |
| Miki Uchida | 50 m freestyle | 25.33 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |
| Miki Uchida | 100 m freestyle | 54.22 | =10 Q | 54.30 | 12 | Did not advance | Did not advance |
| Kanako Watanabe | 100 m breaststroke | 1:06.81 | 5 Q | 1:06.64 | 5 Q | 1:06.43 | 4 |
| Kanako Watanabe | 200 m breaststroke | 2:23.29 | 1 Q | 2:22.15 | 3 Q | 2:21.15 | |
| Kanako Watanabe | 200 m individual medley | 2:10.37 | 3 Q | 2:09.61 | 3 Q | 2:08.45 | |
| Misaki Yamaguchi | 50 m butterfly | 26.68 | 20 | Did not advance | Did not advance | Did not advance | Did not advance |
| Miki Uchida Rikako Ikee Misaki Yamaguchi Yayoi Matsumoto | 4×100 m freestyle relay | 3:38.47 | 9 | — | — | Did not advance | Did not advance |
| Chihiro Igarashi Rikako Ikee Sachi Mochida Tomomi Aoki | 4×200 m freestyle relay | 7:54.58 | 6 Q | — | — | 7:54.62 | 7 |
| Sayaka Akase Natsumi Hoshi Miki Uchida Kanako Watanabe | 4×100 m medley relay | 4:00.43 | 8 Q | — | — | DSQ | DSQ |

### Mixed

| Athlete | Event | Heat | Heat | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank |
| Yuki Kobori Naito Ehara Rikako Ikee Misaki Yamaguchi | 4×100 m freestyle relay | 3:28.54 | 10 | Did not advance | Did not advance |

## Synchronized swimming

Japan fielded a full squad of twelve synchronized swimmers (one male and eleven female) to compete in each of the following events.

### Women

| Athlete | Event | Preliminaries | Preliminaries | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Yukiko Inui | Solo technical routine | 89.5851 | 5 Q | 90.7603 | 5 |
| Yukiko Inui | Solo free routine | 91.7333 | 5 Q | 92.4333 | 5 |
| Yukiko Inui Risako Mitsui | Duet technical routine | 90.3504 | 3 Q | 92.0079 | |
| Yukiko Inui Risako Mitsui | Duet free routine | 93.5333 | 3 Q | 93.4333 | 4 |
| Aika Hakoyama Yukiko Inui Kei Marumo Risako Mitsui Kanami Nakamaki Mai Nakamura Kano Omata Kurumi Yoshida | Team technical routine | 91.6516 | 4 Q | 92.4133 | |
| Aika Hakoyama Aiko Hayashi Yukiko Inui Kei Marumo Risako Mitsui Kanami Nakamaki Mai Nakamura Kurumi Yoshida | Team free routine | 93.7000 | 3 Q | 93.9000 | |
| Aika Hakoyama Aiko Hayashi Yukiko Inui Kei Marumo Risako Mitsui Kanami Nakamaki Mai Nakamura Kano Omata Asuka Tasaki Kurumi Yoshida | Free routine combination | 92.6000 | 3 Q | 93.8000 | |

### Mixed

| Athlete | Event | Preliminaries | Preliminaries | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Atsushi Abe Yumi Adachi | Duet technical routine | 81.8724 | 5 Q | 82.3509 | 5 |
| Atsushi Abe Yumi Adachi | Duet free routine | 84.9667 | 7 Q | 84.9000 | 7 |

## Water polo
### Men's tournament
#### Team roster

* Katsuyuki Tanamura
* Seiya Adachi
* Atsushi Arai
* Mitsuaki Shiga
* Akira Yanase
* Atsuto Iida
* Yusuke Shimizu
* Yuki Kadono
* Koji Takei
* Kenya Yasuda
* Keigo Okawa
* Shota Hazui
* Tomoyoshi Fukushima

#### Group play

| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Serbia | 3 | 3 | 0 | 0 | 40 | 26 | +14 | 6 | Advanced to quarterfinals |
| 2 | Australia | 3 | 1 | 1 | 1 | 24 | 19 | +5 | 3 | Advanced to playoffs |
| 3 | Montenegro | 3 | 1 | 1 | 1 | 29 | 26 | +3 | 3 | Advanced to playoffs |
| 4 | Japan | 3 | 0 | 0 | 3 | 23 | 45 | −22 | 0 | |
| 27 July 2015 21:30 | Report | Japan | 4–10 | Australia | Kazan Attendance: 2,287 Referees: Massimiliano Caputi (ITA), Hatem Gaber (EGY) |
| Kazan Attendance: 2,287 Referees: Massimiliano Caputi (ITA), Hatem Gaber (EGY) |||
| 27 July 2015 21:30 | Report | four players 1 | Goals | Campbell 3 | Kazan Attendance: 2,287 Referees: Massimiliano Caputi (ITA), Hatem Gaber (EGY) |
| 29 July 2015 17:30 | Report | Serbia | 19–9 | Japan | Kazan Attendance: 1,016 Referees: Masoud Rezvani (IRI), Stephane Roy (CAN) |
| Kazan Attendance: 1,016 Referees: Masoud Rezvani (IRI), Stephane Roy (CAN) |||
| 29 July 2015 17:30 | Report | Nikić 6 | Goals | Okawa, Takei 3 | Kazan Attendance: 1,016 Referees: Masoud Rezvani (IRI), Stephane Roy (CAN) |
| 31 July 2015 13:30 | Report | Japan | 10–16 | Montenegro | Kazan Attendance: 640 Referees: Dion Willis (RSA), Massimiliano Caputi (ITA) |
| Kazan Attendance: 640 Referees: Dion Willis (RSA), Massimiliano Caputi (ITA) |||
| 31 July 2015 13:30 | Report | Takei 4 | Goals | Ivović, Radović 4 | Kazan Attendance: 640 Referees: Dion Willis (RSA), Massimiliano Caputi (ITA) |

#### 13th–16th place semifinals

| 2 August 2015 12:10 | Report | Argentina | 6–14 | Japan | Kazan Attendance: 218 Referees: Viktor Salnichenko (KAZ), Hatem Gaber (EGY) |
| Kazan Attendance: 218 Referees: Viktor Salnichenko (KAZ), Hatem Gaber (EGY) |||
| 2 August 2015 12:10 | Report | Carabantes, Demarchi 3 | Goals | Takei 4 | Kazan Attendance: 218 Referees: Viktor Salnichenko (KAZ), Hatem Gaber (EGY) |

#### 13th place game

| 4 August 2015 10:50 | Report | Russia | 9–13 | Japan | Kazan Attendance: 821 Referees: György Kun (HUN), Masoud Rezvani (IRI) |
| Kazan Attendance: 821 Referees: György Kun (HUN), Masoud Rezvani (IRI) |||
| 4 August 2015 10:50 | Report | Bychkov 3 | Goals | Okawa 3 | Kazan Attendance: 821 Referees: György Kun (HUN), Masoud Rezvani (IRI) |

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

* Rikako Miura
* Chiaki Sakanoue
* Yuri Kazama
* Shino Magariyama
* Moe Nakata
* Ayaka Takahashi
* Yumi Nakano
* Mitsuki Hashiguchi
* Kana Hosoya
* Tsubasa Mori
* Marina Tokumoto
* Kotori Suzuki
* Yuko Umeda

#### Group play

| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Italy | 3 | 3 | 0 | 0 | 40 | 18 | +22 | 6 | Advanced to quarterfinals |
| 2 | United States | 3 | 2 | 0 | 1 | 39 | 14 | +25 | 4 | Advanced to playoffs |
| 3 | Brazil | 3 | 1 | 0 | 2 | 19 | 36 | −17 | 2 | Advanced to playoffs |
| 4 | Japan | 3 | 0 | 0 | 3 | 13 | 43 | −30 | 0 | |
| 26 July 2015 20:10 | Report | Japan | 3–15 | Italy | Kazan Attendance: 2,286 Referees: Francesc Buch (ESP), Mark Koganov (AZE) |
| Kazan Attendance: 2,286 Referees: Francesc Buch (ESP), Mark Koganov (AZE) |||
| 26 July 2015 20:10 | Report | three players 1 | Goals | Garibotti, Tabani 3 | Kazan Attendance: 2,286 Referees: Francesc Buch (ESP), Mark Koganov (AZE) |
| 28 July 2015 13:30 | Report | Brazil | 11–8 | Japan | Kazan Attendance: 543 Referees: Stephane Roy (CAN), Viktor Salnichenko (KAZ) |
| Kazan Attendance: 543 Referees: Stephane Roy (CAN), Viktor Salnichenko (KAZ) |||
| 28 July 2015 13:30 | Report | Chiappini 5 | Goals | Nakano 3 | Kazan Attendance: 543 Referees: Stephane Roy (CAN), Viktor Salnichenko (KAZ) |
| 30 July 2015 10:50 | Report | Japan | 2–17 | United States | Kazan Attendance: 729 Referees: Dion Willis (RSA), Vojin Putniković (SRB) |
| Kazan Attendance: 729 Referees: Dion Willis (RSA), Vojin Putniković (SRB) |||
| 30 July 2015 10:50 | Report | Nakano 2 | Goals | Steffens 4 | Kazan Attendance: 729 Referees: Dion Willis (RSA), Vojin Putniković (SRB) |

#### 13th–16th place semifinals

| 1 August 2015 12:10 | Report | Japan | 6–9 | France | Kazan Attendance: 1,969 Referees: Fabio Toffoli (BRA), Peter de Jong (NED) |
| Kazan Attendance: 1,969 Referees: Fabio Toffoli (BRA), Peter de Jong (NED) |||
| 1 August 2015 12:10 | Report | Nakano 2 | Goals | Guillet 5 | Kazan Attendance: 1,969 Referees: Fabio Toffoli (BRA), Peter de Jong (NED) |

#### 15th place game

| 3 August 2015 09:30 | Report | South Africa | 7–15 | Japan | Kazan Attendance: 329 Referees: Peter de Jong (NED), German Moller (ARG) |
| Kazan Attendance: 329 Referees: Peter de Jong (NED), German Moller (ARG) |||
| 3 August 2015 09:30 | Report | White 2 | Goals | Nakano 4 | Kazan Attendance: 329 Referees: Peter de Jong (NED), German Moller (ARG) |