(From L to R) Japan's Ryosuke Irie, Kosuke Kitajima, Takuro Fujii and Shinri Shioura celebrate with their bronze medals at the men's 4x100m medley relay victory ceremony during the World Swimming Championships at the Sant Jordi arena in Barcelona August 4, 2013. REUTERS/Albert Gea (SPAIN - Tags: SPORT SWIMMING)

(From L to R) Japan's Ryosuke Irie, Kosuke Kitajima, Takuro Fujii and Shinri Shioura pose with their bronze medals at the men's 4x100m medley relay victory ceremony during the World Swimming Championships at the Sant Jordi arena in Barcelona August 4, 2013. REUTERS/Albert Gea (SPAIN - Tags: SPORT SWIMMING)

Japan's Kosuke Kitajima swims in the men's 100m breaststroke semi-final during the World Swimming Championships at the Sant Jordi arena in Barcelona July 28, 2013. REUTERS/Gustau Nacarino (SPAIN - Tags: SPORT SWIMMING)

(L-R) Japan's Takuro Fujii, Takeshi Matsuda, Kosuke Kitajima and Ryosuke Irie pose with their silver medals during the men's 4x100m medley relay victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 4, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

(L-R) Japan's Takuro Fujii, Takeshi Matsuda, Kosuke Kitajima and Ryosuke Irie pose with their silver medals during the men's 4x100m medley relay victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 4, 2012. REUTERS/Toby Melville (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

(L-R) Japan's Ryosuke Irie, Kosuke Kitajima, Takeshi Matsuda and Takuro Fujii pose with their silver medals on the podium during the men's 4x100m medley relay victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 4, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

Kosuke Kitajima of Japan turns as he competes in the men's 200m breaststroke heats swimming event during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Tim Wimborne (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima (L) and Britain's Andrew Willis talk after their men's 200m breaststroke heat during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Toby Melville (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Kosuke Kitajima of Japan competes in the men's 200m breaststroke heats swimming event during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima (L) and Britain's Andrew Willis react after their men's 200m breaststroke heat during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Japan's Kosuke Kitajima reacts after his men's 200m breaststroke heat during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Kosuke Kitajima of Japan prepares to compete in the men's 200m breaststroke heats swimming event during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima is seen underwater as he swims in the men's 200m breaststroke heats during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING OLYMPICS) 

Japan's Kosuke Kitajima (L) and Britain's Andrew Willis smile after their men's 200m breaststroke heat during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Andrew Willis of Britain and Kosuke Kitajima (L) of Japan react after competing in the men's 200m breaststroke heats swimming event during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Toby Melville (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Kosuke Kitajima (L) of Japan and South Africa's Cameron van der Burgh prepare to start their men's 100m breast stroke semi-final during the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

South Africa's Cameron van der Burgh (R) reacts beside Japan's Kosuke Kitajima after setting an Olympic record during the men's 100m breatstroke semi-final
during the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. Van der Burgh set the record with a time of 58.83 seconds. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima makes a turn during the men's 100m breaststroke semi-final at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/Tim Wimborne (BRITAIN - Tags: SPORT SWIMMING SPORT OLYMPICS)

South Africa's Cameron Van Der Burgh (R) celebrates next to Japan's Kosuke Kitajima after finishing first in the men's 100m breaststroke semi-final at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Cameron van der Burgh of South Africa celebrates next to second place finisher Kosuke Kitajima (L) after winning their men's 100m breaststroke semi-final during the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima stares down the pool after his men's 100m breaststroke semi-final during the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Kosuke Kitajima (L) of Japan congratulates South Africa's Cameron van der Burgh after he set an Olympic record in their men's 100m breaststroke semi-final during the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A lane judge watches as Japan's Kosuke Kitajima completes his turn during the men's 100m breaststroke heats at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/Tim Wimborne (BRITAIN - Tags: SPORT SWIMMING SPORT OLYMPICS)

Kosuke Kitajima of Japan swims in heat 6 during the men's 100m breaststroke heats at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING SPORT OLYMPICS)

Kosuke Kitajima of Japan checks his time after swimming in heat 6 during the men's 100m breaststroke heats at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Ryo Tateishi (L) of Japan and compatriot Kosuke Kitajima prepare to start their men's 100m breaststroke heats at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima swims during the men's 100m breaststroke heats at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Australia's Christian Sprenger (front) and Japan's Kosuke Kitajima swim during the men's 100m breaststroke heats at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima reacts after heat 6 during the men's 100m breaststroke heats at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima swims during the men's 100m breaststroke heats at the London 2012 Olympic Games at the Aquatics Centre July 28, 2012. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Japan's Kosuke Kitajima (R) and Ryosuke Irie attend a training session at the Aquatics Centre before the start of the London 2012 Olympic Games July 27, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Japan's Kosuke Kitajima attends a training session at the Aquatics Centre before the start of the London 2012 Olympic Games July 27, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Japan's Kosuke Kitajima attends a training session at the Aquatics Centre before the start of the London 2012 Olympic Games July 27, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Japan's Kosuke Kitajima attends a training session at the Aquatics Centre before the start of the London 2012 Olympic Games July 27, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Japan's swimmer Kosuke Kitajima attends a news conference at the London 2012 Olympic Games village in London July 25, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Japan's swimmer Kosuke Kitajima attends a news conference at the London 2012 Olympic Games village in London July 25, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Japan's swimmer Kosuke Kitajima attends a news conference at the London 2012 Olympic Games village in London July 25, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

(R - L) Japan's swimmers Natsumi Hoshi, Ryosuke Irie, Kosuke Kitajima, Aya Terakawa, Takeshi Matsuda and coach Norimasa Hirai pose for photos at a news conference at the London 2012 Olympic Games village in London July 25, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Japan's swimmer Kosuke Kitajima attends a news conference at the London 2012 Olympic Games village in London July 25, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Japan's swimmer Kosuke Kitajima (L) poses with Maldives' swimmers after a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 23, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Japan's swimmer Kosuke Kitajima sits in the stands during a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 23, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Japan's swimmer Kosuke Kitajima (R) sits in the stand with a coach during a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 23, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Japan's swimmer Kosuke Kitajima (R) sits in the stand with a coach during a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 23, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Japan's Kosuke Kitajima swims in the men's 200m breaststroke final at the FINA Swimming World Cup in Tokyo November 12, 2011. Grimacing in pain and gasping hard for breath, Kitajima gave the impression of a man clinging on for dear life at the Japanese Olympic swimming trials. Looks, though, can deceive. Picture taken November 12, 2011. To match story OLY-SWIM-KITAJIMA-PROFILE/ REUTERS/Toru Hanai (JAPAN - Tags: SPORT SWIMMING OLYMPICS) 

Japan's Kosuke Kitajima waits to compete in the men's 200m breaststroke final at the FINA Swimming World Cup in Tokyo November 12, 2011. Grimacing in pain and gasping hard for breath, Kitajima gave the impression of a man clinging on for dear life at the Japanese Olympic swimming trials. Looks, though, can deceive. Picture taken November 12, 2011. To match story OLY-SWIM-KITAJIMA-PROFILE/ REUTERS/Toru Hanai (JAPAN - Tags: SPORT SWIMMING OLYMPICS) 

Kosuke Kitajima of Japan prepares to swim in the men's 100 meter breaststroke during the AT&T Winter National Championships in Atlanta, Georgia December 2, 2011. REUTERS/Chris Keane (UNITED STATES - Tags: SPORT SWIMMING) 

Kosuke Kitajima of Japan swims in the men's 100 meter breaststroke preliminary race during the AT&T Winter National Championships in Atlanta, Georgia December 2, 2011. REUTERS/Chris Keane (UNITED STATES - Tags: SPORT SWIMMING) 

Kosuke Kitajima of Japan swims in the men's 200 meter IM during the AT&T Winter National Championships in Atlanta, Georgia December 1, 2011. REUTERS/Chris Keane (UNITED STATES - Tags: SPORT SWIMMING) 

Kosuke Kitajima of Japan swims in the men's 200 meter IM during the AT&T Winter National Championships in Atlanta, Georgia December 1, 2011. REUTERS/Chris Keane (UNITED STATES - Tags: SPORT SWIMMING) 

Japan's Kosuke Kitajima swims in the men's 100m breaststroke final at the FINA Swimming World Cup in Tokyo November 13, 2011. REUTERS/Toru Hanai (JAPAN - Tags: SPORT SWIMMING) 

Japan's Kosuke Kitajima waits to compete in the men's 200m breaststroke final at the FINA Swimming World Cup in Tokyo November 12, 2011. REUTERS/Toru Hanai (JAPAN - Tags: SPORT SWIMMING) 

Japan's Kosuke Kitajima swims in the men's 200m breaststroke final at the FINA Swimming World Cup in Tokyo November 12, 2011. REUTERS/Toru Hanai (JAPAN - Tags: SPORT SWIMMING) 

Gold medallist Hungary's Daniel Gyurta, silver medallist Japan's Kosuke Kitajima (L) and bronze medallist Germany's Christian Vom Lehn (R) pose together after the men's 200m breaststroke event at the 14th FINA World Championships in Shanghai July 29, 2011. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING IMAGE OF THE DAY AQUATICS) 

Hungary's Daniel Gyurta (L) and Japan's Kosuke Kitajima compete in the men's 200m breaststroke final at the 14th FINA World Championships in Shanghai July 29, 2011. REUTERS/Christinne Muschi (CHINA - Tags: SPORT SWIMMING AQUATICS) 

Britain's Michael Jamieson, Eric Shanteau of the U.S., Hungary's Daniel Gyurta and Japan's Kosuke Kitajima (L-R) compete in the men's 200m breaststroke final at the 14th FINA World Championships in Shanghai July 29, 2011. REUTERS/Carlos Barria (CHINA - Tags: SPORT SWIMMING AQUATICS) 

Japan's Kosuke Kitajima watches the scoreboard after competing in the men's 200m breaststroke final at the 14th FINA World Championships in Shanghai July 29, 2011. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING AQUATICS) 

Hungary's Daniel Gyurta celebrates after winning the men's 200m breaststroke final as Japan's Kosuke Kitajima, who came second, looks on in the background at the 14th FINA World Championships in Shanghai July 29, 2011. REUTERS/Bobby Yip (CHINA - Tags: SPORT SWIMMING AQUATICS) 

Japan's Kosuke Kitajima competes in the men's 200m breaststroke final at the 14th FINA World Championships in Shanghai July 29, 2011. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING AQUATICS) 

Japan's Kosuke Kitajima competes in the men's 200m breaststroke final at the 14th FINA World Championships in Shanghai July 29, 2011. REUTERS/Carlos Barria (CHINA - Tags: SPORT SWIMMING AQUATICS) 

Japan's Kosuke Kitajima is seen after competing in the men's 200m breaststroke heats at the 14th FINA World Championships in Shanghai July 28, 2011. REUTERS/Christinne Muschi (CHINA - Tags: SPORT SWIMMING AQUATICS)