Swimming - 2018 Asian Games - Women's 50m Freestyle - GBK Aquatic Center, Jakarta, Indonesia - August 24, 2018 (L - R) China's Liu Xiang, Japan's Rikako Ikee and China's Wu Qingfeng celebrate with their medals after the Women's 50m Freestyle REUTERS/Athit Perawongmetha 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China celebrates after winning the gold medal and breaking the world record. REUTERS/Jeremy Lee TPX IMAGES OF THE DAY 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China celebrates after winning the gold medal and breaking the world record. REUTERS/Jeremy Lee TPX IMAGES OF THE DAY 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China celebrates after winning the gold medal and breaking the world record. REUTERS/Jeremy Lee 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China competes. REUTERS/Jeremy Lee 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China celebrates after winning the gold medal and breaking the world record. REUTERS/Jeremy Lee 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China celebrates after winning the gold medal and breaking the world record. REUTERS/Jeremy Lee 

Swimming - 2018 Asian Games - Women's 50m Backstroke Medal Ceremony - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Gold medalist Liu Xiang of China, silver medalist Fu Yuanhui of China and bronze medalist Natsumi Sakai of Japan on the podium. REUTERS/Athit Perawongmetha 

Swimming - 2018 Asian Games - Women's 50m Backstroke Medal Ceremony - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Gold medalist Liu Xiang of China on the podium. REUTERS/Athit Perawongmetha 

Swimming - 2018 Asian Games - Women's 50m Backstroke Medal Ceremony - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Gold medalist Liu Xiang of China on the podium. REUTERS/Athit Perawongmetha 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China celebrates after winning the gold medal and breaking the world record. REUTERS/Jeremy Lee 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China competes. REUTERS/Athit Perawongmetha 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China competes. REUTERS/Jeremy Lee 

Swimming - 2018 Asian Games - Women's 50m Backstroke Final - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China celebrates after winning the gold medal. REUTERS/Jeremy Lee 

Swimming - 2018 Asian Games - Women's 50m Backstroke heats - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China competes REUTERS/Athit Perawongmetha 

Swimming - 2018 Asian Games - Women's 50m Backstroke heats - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Park Han-byeol of South Korea and Liu Xiang of China compete. REUTERS/Athit Perawongmetha 

Swimming - 2018 Asian Games - Women's 50m Backstroke heats - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China competes REUTERS/Athit Perawongmetha 

Swimming - 2018 Asian Games - Women's 50m Backstroke heats - GBK Aquatics Center - Jakarta, Indonesia - August 21, 2018 - Liu Xiang of China competes REUTERS/Athit Perawongmetha 

(L to R) President of Didi Chuxing Jean Liu, Chairman of China FAW Group Xu Liuping, Chairman of Beijing Automotive Group Xu Heyi, Chairman and President of BYD Company Limited Wang Chuanfu, Pesident of Guangzhou Automotive Group Feng Xingya, founder and Chief Executive Officer of CHJ Automotive Li Xiang, attend a news conference ahead of the Beijing auto show in Beijing, China April 24, 2018. REUTERS/Norihiko Shirouzu 

Basketball - NBA Global Games - Shanghai, China - 09/10/16. Houston Rockets v New Orleans Pelicans - Former Chinese hurdler Liu Xiang (R) and Chinese pole vaulter Wu Sha are seen. REUTERS/Aly Song 

Liu Shiyu (C), chairman of the China Securities Regulatory Commission (CSRC), Xiang Junbo (R), chairman of China Insurance Regulatory Commission (CIRC), and Shang Fulin (L), chairman of the China Banking Regulatory Commission (CBRC), leave a news conference on the sidelines of the National People's Congress (NPC), China's parliament, in Beijing, China, March 12, 2016. REUTERS/Jason Lee 

China's Liu Xiang (L, bronze) and Fu Yuanhui (gold) pose with their medals after the women's 50m backstroke final at the Aquatics World Championships in Kazan, Russia, August 6, 2015. REUTERS/Hannibal Hanschke 

China's Liu Xiang poses with her bronze medal after the women's 50m backstroke final at the Aquatics World Championships in Kazan, Russia, August 6, 2015. REUTERS/Hannibal Hanschke 

China's Liu Xiang poses with her bronze medal after the women's 50m backstroke final at the Aquatics World Championships in Kazan, Russia, August 6, 2015. REUTERS/Hannibal Hanschke 

China's Liu Xiang starts in the women's 50m backstroke semi-final at the Aquatics World Championships in Kazan, Russia, August 5, 2015. REUTERS/Stefan Wermuth

China's Liu Xiang starts in the women's 50m backstroke semi-final at the Aquatics World Championships in Kazan, Russia, August 5, 2015. REUTERS/Stefan Wermuth

China's Liu Xiang starts in a women's 50m backstroke heat at the Aquatics World Championships in Kazan, Russia, August 5, 2015. REUTERS/Stefan Wermuth

China's Liu Xiang starts in a women's 50m backstroke heat at the Aquatics World Championships in Kazan, Russia, August 5, 2015. REUTERS/Stefan Wermuth

China's Liu Xiang starts in a women's 50m backstroke heat at the Aquatics World Championships in Kazan, Russia, August 5, 2015. REUTERS/Stefan Wermuth

Liu Xiang attends his retirement ceremony in Shanghai May 17, 2015. China offered an emotional farewell to its newly-retired sports hero Liu, the 2004 Olympic sprint hurdles champion, at the Diamond League meeting on Sunday. REUTERS/Aly Song 

Liu Xiang attends his retirement ceremony in Shanghai May 17, 2015. China offered an emotional farewell to its newly-retired sports hero Liu, the 2004 Olympic sprint hurdles champion, at the Diamond League meeting on Sunday. REUTERS/Aly Song TPX IMAGES OF THE DAY

Liu Xiang attends his retirement ceremony in Shanghai May 17, 2015. China offered an emotional farewell to its newly-retired sports hero Liu, the 2004 Olympic sprint hurdles champion, at the Diamond League meeting on Sunday. REUTERS/Aly Song 

Liu Xiang attends his retirement ceremony in Shanghai May 17, 2015. China offered an emotional farewell to its newly-retired sports hero Liu, the 2004 Olympic sprint hurdles champion, at the Diamond League meeting on Sunday. REUTERS/Aly Song TPX IMAGES OF THE DAY

Liu Xiang tears during his retirement ceremony in Shanghai May 17, 2015. China offered an emotional farewell to its newly-retired sports hero Liu, the 2004 Olympic sprint hurdles champion, at the Diamond League meeting on Sunday. REUTERS/Aly Song 

Liu Xiang attends his retirement ceremony in Shanghai May 17, 2015. China offered an emotional farewell to its newly-retired sports hero Liu, the 2004 Olympic sprint hurdles champion, at the Diamond League meeting on Sunday. REUTERS/Aly Song 

Liu Xiang attends his retirement ceremony in Shanghai May 17, 2015. China offered an emotional farewell to its newly-retired sports hero Liu, the 2004 Olympic sprint hurdles champion, at the Diamond League meeting on Sunday. REUTERS/Aly Song 

Former Chinese hurdler Liu Xiang arrives for the Laureus World Sports Awards 2015 in Shanghai April 15, 2015. REUTERS/Aly Song

Former NBA player Yao Ming (R) and Chinese hurdler Liu Xiang, delegates of the Chinese People's Political Consultative Conference (CPPCC), arrive at the Great Hall of the People to attend the third plenary meeting of CPPCC at the Great Hall of the People in Beijing, March 11, 2015. REUTERS/Kim Kyung-Hoon (CHINA - Tags: POLITICS SPORT) 

Chinese hurdler Liu Xiang, a delegate of the Chinese People's Political Consultative Conference (CPPCC), is surrounded by journalists as he arrives at the Great Hall of the People to attend the opening of the CPPCC at Tiananmen Square in Beijing, March 3, 2014. REUTERS/Kim Kyung-Hoon (CHINA - Tags: POLITICS SPORT) 

Former NBA basketball player Yao Ming (2nd row, R) and China's hurdler Liu Xiang (front, R), who are delegates of the Chinese People's Political Consultative Conference (CPPCC) arrive for registration ahead of the opening of the CPPCC at Beijing International Hotel, March 2, 2014. REUTERS/Stringer (CHINA - Tags: POLITICS SPORT) 

China's hurdler Liu Xiang attends as a delegate at a session of the Chinese People's Political Consultative Conference (CPPCC) of the Shanghai Municipal Committee, in Shanghai January 18, 2014. REUTERS/Aly Song (CHINA - Tags: POLITICS SPORT ATHLETICS) 

China's hurdler Liu Xiang sits on a wheelchair as he arrives at Shanghai Pudong airport August 14, 2012. Liu crashed out of the heats in the 110 metres hurdles at the London 2012 Olympic Games in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/Aly Song (CHINA - Tags: SPORT ATHLETICS HEALTH) 

China's hurdler Liu Xiang sits on a wheelchair as he arrives at Shanghai Pudong airport August 14, 2012. Liu crashed out of the heats in the 110 metres hurdles at the London 2012 Olympic Games in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/Aly Song (CHINA - Tags: SPORT ATHLETICS HEALTH) 

China's hurdler Liu Xiang sits onto a wheelchair as he arrives at Shanghai Pudong airport August 14, 2012. Liu crashed out of the heats in the 110 metres hurdles at the London 2012 Olympic Games in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/Aly Song (CHINA - Tags: SPORT ATHLETICS HEALTH) 

China's Liu Xiang (R) has his arm held up by Hungary's Balazs Baji after crashing into the first hurdle during their men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu experienced deja vu of the most agonising kind on Tuesday when the Achilles injury that forced him out of the high hurdles heats in Beijing four years ago ended his London Olympics campaign at the same stage. REUTERS/Lucy Nicholson (BRITAIN - Tags: SPORT OLYMPICS ATHLETICS) 

China's Liu Xiang hops down the track after crashing into the first hurdle and failing to finish his men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

China's Liu Xiang sits on the track after suffering an injury in his men's 110m hurdles round 1 heat during the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

China's Liu Xiang falls after hitting a hurdle in his men's 110m hurdles round 1 heat during the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. REUTERS/Mark Blinch (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY) 

China's Liu Xiang (C) is helped off the track by Britain's Andrew Turner (L) and Spain's Jackson Quinonez after crashing into the first hurdle and failing to finish his men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

China's Liu Xiang kisses the last hurdle in his lane after crashing into the first hurdle and failing to finish his men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY) 

China's Liu Xiang kisses the last hurdle in his lane after he crashed and failed to finish his men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles at the London Olympics on Tuesday in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

China's Liu Xiang falls while competing in his men's 110m hurdles round 1 heat during the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. REUTERS/Mark Blinch (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

China's Liu Xiang kisses the last hurdle in his lane after his men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles at the London Olympics on Tuesday in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

China's Liu Xiang hops back to his lane after crashing and failing to finish his men's 110m hurdles round 1 heat during the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

China's Liu Xiang kisses the last hurdle in his lane after his men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles at the London Olympics on Tuesday in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

China's Liu Xiang (C) falls while competing in his men's 110m hurdles round 1 heat during the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. At left is Poland's Artur Noga and at right is Hungary's Balazs Baji. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS)

China's Liu Xiang hops down the track after crashing into the first hurdle and failing to finish his men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

China's Liu Xiang falls after he crashed into the first hurdle near Poland's Artur Noga (L) and Hungary's Balazs Baji in their men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

China's Liu Xiang (R) falls as Poland's Artur Noga pulls up in the men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 meters hurdles at the London Olympics on Tuesday in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)