Sun Yang of China celebrates after men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Ding Ting)

Sun Yang of China celebrates after men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Li Xiang)

Sun Yang of China celebrates after men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Ding Ting)

Sun Yang of China celebrates after men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Ding Ting)

Sun Yang (L) of China talks with his teammate Ji Xinjie after men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Ding Ting)

Sun Yang of China enters water during men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Ding Ting)

Sun Yang of China competes during men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Ding Ting)

Sun Yang of China celebrates after men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Fei Maohua)

Sun Yang of China celebrates after men's 400m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Sun won the gold medal. (Xinhua/Li Xiang)