Liu Hong of China celebrates after winning the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45. (Xinhua/Li Gang)

Liu Hong (Front) of China competes during the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45. (Xinhua/Wang Haofei)

Liu Hong (L) of China celebrates with her compatriot Lu Xiuzhi after winning the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal with the same time. (Xinhua/Wang Lili)

Liu Hong of China competes in the women's 20km race walk at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45. (Xinhua/Yue Yuewei)

Liu Hong (L) of China embraces her compatriot Lu Xiuzhi after winning the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal with the same time. (Xinhua/Li Gang)

Liu Hong (R) of China celebrates with her compatriot Lu Xiuzhi after competing in the women's 20km race walk at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal with the same time. (Xinhua/Wang Lili)

Lyudmyla Olyanovska (2nd L) of Ukraine competes during the women's 20km race walk at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Olyanovska took the bronze medal of the event with a time of 1:28:13. (Xinhua/Li Gang)

Liu Hong of China celebrates with her compatriot Lu Xiuzhi after competing in the women's 20km race walk at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal with the same time. (Xinhua/Wang Lili)

Liu Hong (R) and Lu Xiuzhi of China cool themselves down while competing in the women's 20km race walk at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal with the same time. (Xinhua/Yue Yuewei)

Liu Hong (R) of China celebrates with her compatriot Lu Xiuzhi after competing in the women's 20km race walk at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal with the same time. (Xinhua/Wang Lili)

Liu Hong (L) and Lu Xiuzhi of China compete in the women's 20km race walk at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal with the same time. (Xinhua/Yue Yuewei)

Liu Hong (R) and Lu Xiuzhi (C) of China compete in the women's 20km race walk at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal with the same time. (Xinhua/Yue Yuewei)

Liu Hong (R) and Lu Xiuzhi of China compete during the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45 and Lu took the silver medal. (Xinhua/Wang Haofei)

Athletes wait at the start line during the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu Hong of China claimed the title of the event with a time of 1:27:45. (Xinhua/Li Gang)

Liu Hong (R) of China competes during the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu Hong of China claimed the title of the event with a time of 1:27:45. (Xinhua/Wang Haofei)

Lu Xiuzhi of China competes during the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Lu took the silver medal of the event with a time of 1:27:45. (Xinhua/Wang Haofei)

Liu Hong of China competes during the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45. (Xinhua/Wang Haofei)

Liu Hong (C) of China competes during the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45. (Xinhua/Wang Haofei)

Liu Hong of China celebrates before crossing the finish line during the women's 20km walk race at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 28, 2015. Liu claimed the title of the event with a time of 1:27:45. (Xinhua/Wang Lili)