Gold medalist Jiao Liuyang of China celebrates during the victory ceremony for the women's 200m butterfly final at the Munhak Park Tae-hwan Aquatics Center during the 17th Asian Games in Incheon September 24, 2014. REUTERS/Kim Kyung-hoon (SOUTH KOREA - Tags: SPORT SWIMMING) 

Gold medalist Jiao Liuyang of China poses during the victory ceremony for the women's 200m butterfly final at the Munhak Park Tae-hwan Aquatics Center during the 17th Asian Games in Incheon September 24, 2014. REUTERS/Kim Kyung-hoon (SOUTH KOREA - Tags: SPORT SWIMMING) 

Gold medallist Jiao Liuyang of China (L) celebrates next to silver medalist Natsumi Hoshi of Japan after the women's 200m butterfly final at the Munhak Park Tae-hwan Aquatics Center during the 17th Asian Games in Incheon September 24, 2014. REUTERS/Kim Kyung-hoon (SOUTH KOREA - Tags: SPORT SWIMMING) 

Gold medallist Jiao Liuyang of China celebrates after winning the Women's 200m Butterfly final at the Munhak Park Tae-hwan Aquatics Center during the 17th Asian Games in Incheon September 24, 2014. REUTERS/Kim Kyung-hoon (SOUTH KOREA - Tags: SPORT SWIMMING) 

China's Jiao Liuyang swims in the women's 200m butterfly semi-final during the World Swimming Championships at the Sant Jordi arena in Barcelona July 31, 2013. REUTERS/Albert Gea (SPAIN - Tags: SPORT SWIMMING)

Jiao Liuyang of China competes in women's 200m butterfly heats during the World Swimming Championships at the Sant Jordi arena in Barcelona July 31, 2013. REUTERS/Albert Gea (SPAIN - Tags: SPORT SWIMMING)

Jiao Liuyang of China competes in women's 200m butterfly heats during the World Swimming Championships at the Sant Jordi arena in Barcelona July 31, 2013. REUTERS/Michael Dalder (SPAIN - Tags: SPORT SWIMMING)

Jiao Liuyang of China prepares to compete in women's 200m butterfly heats during the World Swimming Championships at the Sant Jordi arena in Barcelona July 31, 2013. REUTERS/Michael Dalder (SPAIN - Tags: SPORT SWIMMING)

Silver medallist Jiao Liuyang of China waves during the award ceremony for the women's 50m butterfly final during the FINA World Swimming Championships in Istanbul December 14, 2012. REUTERS/Murad Sezer (TURKEY - Tags: SPORT SWIMMING)

Gold medallist Lu Ying (C) of China poses with her compatriot and silver medallist Jiao Liuyang (L) and bronze medallist Jeanette Ottesen Gray of Denmark during the award ceremony for the women's 50m butterfly final during the FINA World Swimming Championships in Istanbul December 14, 2012. REUTERS/Murad Sezer (TURKEY - Tags: SPORT SWIMMING)

Gold medallist Lu Ying (C) of China poses with her compatriot and silver medallist Jiao Liuyang (L) and bronze medallist Jeanette Ottesen Gray of Denmark during the award ceremony for the women's 50m butterfly final during the FINA World Swimming Championships in Istanbul December 14, 2012. REUTERS/Murad Sezer (TURKEY - Tags: SPORT SWIMMING)

First placed Lu Ying (L) of China celebrates with her compatriot and second placed Jiao Liuyang after competing in the women's 50m butterfly final during the FINA World Swimming Championships in Istanbul December 14, 2012. REUTERS/Murad Sezer (TURKEY - Tags: SPORT SWIMMING)

First placed Lu Ying (L) of China celebrates with her compatriot and second placed Jiao Liuyang after competing in the women's 50m butterfly final during the FINA World Swimming Championships in Istanbul December 14, 2012. REUTERS/Murad Sezer (TURKEY - Tags: SPORT SWIMMING)

Silver medalist Jiao Liuyang of China, gold medalist Katinka Hosszu of Hungary and bronze medalist Jemma Lowe of Britain (L to R) display their medals after the women's 200m butterfly final during the FINA World Swimming Championships in Istanbul December 12, 2012. REUTERS/Murad Sezer (TURKEY - Tags: SPORT SWIMMING)

Silver medalist Jiao Liuyang waves from the podium after the women's 200m butterfly final during the FINA World Swimming Championships in Istanbul December 12, 2012. REUTERS/Murad Sezer (TURKEY - Tags: SPORT SWIMMING)

China's Jiao Liuyang stands with her gold medal during the women's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang gestures after she won the women's 200m butterfly final at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

China's Jiao Liuyang (L) hugs second-placed Spain's Mireia Belmonte Garcia after she won the women's 200m butterfly final at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/Tim Wimborne (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

China's Jiao Liuyang poses with her gold medal after winning the women's 200m butterfly final with an Olympic record during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Jiao Liuyang of China bows after she won the women's 200m butterfly final with an Olympic record during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/Toby Melville (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Spain's Mireia Belmonte Garcia, China's Jiao Liuyang and Japan's Natsumi Hoshi (L-R) pose with their silver, gold and bronze medals during the women's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012 REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang waves after she was presented with her gold medal during the women's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang smiles with her gold medal during the women's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang poses with her gold medal during the women's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Spain's Mireia Belmonte Garcia, China's Jiao Liuyang and Japan's Natsumi Hoshi (L-R) pose with their silver, gold and bronze medals during the women's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012 REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Spain's Mireia Belmonte Garcia (L) and China's Jiao Liuyang pose with their silver and gold medals during the women's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang (L) and Spain's Mireia Belmonte Garcia hold their gold and silver medals during the women's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

China's Jiao Liuyang reacts after winning the women's 200m butterfly final with an Olympic record during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang celebrates winning the women's 200m butterfly final during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. Jiao set an Olympic record with a time of 2 minutes 4.06 seconds. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

Jiao Liuyang of China reacts after she won he women's 200m butterfly final with an Olympic record during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/Toby Melville (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang celebrates winning the women's 200m butterfly final during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. Jiao set an Olympic record with a time of 2 minutes 4.06 seconds. REUTERS/Toby Melville (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

Jiao Liuyang of China swims to the win the women's 200m butterfly final with an Olympic record during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang celebrates winning the women's 200m butterfly final with an Olympic record during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang celebrates winning the women's 200m butterfly final during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. Jiao set an Olympic record with a time of 2 minutes 4.06 seconds. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

(From L to R) Spain's Mireia Belmonte Garcia, China's Jiao Liuyang and Kathleen Hersey of the U.S. swim in the women's 200m butterfly final during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. Jiao won the event and set an Olympic record with a time of 2 minutes 4.06 seconds. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

China's Jiao Liuyang (L) embraces Japan's Natsumi Hoshi after their women's 200m butterfly semi-final during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Jiao was first while Hoshi finished second. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT SWIMMING SPORT OLYMPICS)

China's Jiao Liuyang reacts after taking first place in her women's 200m butterfly semi-final during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT SWIMMING SPORT OLYMPICS)

China's Jiao Liuyang reacts after winning her women's 200m butterfly semi-final during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT OLYMPICS SWIMMING TPX IMAGES OF THE DAY) 

China's Jiao Liuyang (L) embraces Japan's Natsumi Hoshi after their women's 200m butterfly semi-final during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Jiao was first while Hoshi finished second. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Cammile Adams of the U.S. (R) hugs China's Jiao Liuyang after their women's 200m butterfly heats during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Britain's Ellen Gandy (L) and China's Jiao Liuyang are seen underwater as they swim in the women's 200m butterfly heats during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING OLYMPICS) 

Jiao Liuyang of China competes in the women's 200m butterfly heats swimming event during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

China's Jiao Liuyang swims in the women's 200m butterfly heat during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)

Silver medallist Ellen Gandy of Britain, gold medallist Jiao Liuyang of China and bronze medallist Liu Zige of China (L-R) pose with their medals for the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING AQUATICS) 

China's Jiao Liuyang poses with her gold medal for the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING AQUATICS) 

China's Jiao Liuyang (L) gestures while speaking to her compatriot Liu Zige after the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. Jiao won the event and Liu took third place. REUTERS/Christinne Muschi (CHINA - Tags: SPORT SWIMMING) 

China's Jiao Liuyang reacts after winning the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. REUTERS/Christinne Muschi (CHINA - Tags: SPORT SWIMMING AQUATICS) 

China's Jiao Liuyang and Liu Zige (facing camera) hug after the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. Jiao won the event and Liu took third place. REUTERS/Christinne Muschi (CHINA - Tags: SPORT SWIMMING AQUATICS) 

China's Jiao Liuyang competes in the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. REUTERS/Bobby Yip (CHINA - Tags: SPORT SWIMMING AQUATICS) 

China's Jiao Liuyang (L) and Liu Zige celebrate after the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. Jiao won the event and Liu took third place. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING AQUATICS) 

China's Jiao Liuyang and Liu Zige celebrate after the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. Jiao won the event and Liu took third place. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING AQUATICS) 

China's Jiao Liuyang celebrates after winning the women's 200m butterfly final at the 14th FINA World Championships in Shanghai July 28, 2011. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING AQUATICS) 

China's Jiao Liuyang competes in the women's 200m butterfly heats at the 14th FINA World Championships in Shanghai July 27, 2011. REUTERS/Carlos Barria (CHINA - Tags: SPORT SWIMMING AQUATICS) 

Australia's Stephanie Rice, Australia's Jessicah Schipper, China's Jiao Liuyang and Japan's Natsumi Hoshi (top-bottom) compete in the women's 200m butterfly heats at the 14th FINA World Championships in Shanghai July 27, 2011. REUTERS/Bobby Yip (CHINA - Tags: SPORT SWIMMING AQUATICS) 

Gold medal winner Jiao Liuyang (C) of China stands with silver medal winner Natsumi Hoshi (L) of Japan and bronze medal winner Choi Hye Ra of South Korea during the medal ceremony for the women's 200m butterfly swimming event at the 16th Asian Games in Guangzhou, Guangdong province, November 15, 2010. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING) 

Jiao Liuyang of China salutes after reciving her gold medal in the women's 200m butterfly swimming event at the 16th Asian Games in Guangzhou, Guangdong province, November 15, 2010. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING) 

Jiao Liuyang of China competes in the women's 200m butterfly swimming final at the 16th Asian Games in Guangzhou, Guangdong province, November 15, 2010. REUTERS/David Gray (CHINA - Tags: SPORT SWIMMING) 

Jiao Liuyang of China swims her women's 200m butterfly heat at the 16th Asian Games in Guangzhou, Guangdong province, November 15, 2010. REUTERS/Michael Dalder (CHINA - Tags: SPORT SWIMMING) 

Jiao Liuyang of China swims her women's 200m butterfly heat at the 16th Asian Games in Guangzhou, Guangdong province, November 15, 2010. REUTERS/Michael Dalder (CHINA - Tags: SPORT SWIMMING) 

Jiao Liuyang of China swims her women's 200m butterfly heat at the 16th Asian Games in Guangzhou, Guangdong province, November 15, 2010. REUTERS/Michael Dalder (CHINA - Tags: SPORT SWIMMING IMAGES OF THE DAY)