Xu Jiayu of China reacts after Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. Xu won the gold medal. (Xinhua/Fei Maohua)

Xu Jiayu of China celebrates after Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. Xu won the gold medal. (Xinhua/Ding Ting)

Xu Jiayu of China reacts after Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. Xu won the gold medal. (Xinhua/Ding Ting)

Xu Jiayu of China celebrates after Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. Xu won the gold medal. (Xinhua/Ding Ting)

Xu Jiayu of China reacts during the awarding ceremony after winning the gold medal of Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. (Xinhua/Fei Maohua)

Xu Jiayu of China reacts during the awarding ceremony after winning the gold medal of Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. (Xinhua/Du Yu)

Xu Jiayu (C) of China reacts during the awarding ceremony after winning the gold medal of Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. (Xinhua/Li Xiang)

Xu Jiayu of China reacts after the awarding ceremony of Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. Xu won the gold medal. (Xinhua/Fei Maohua)

Xu Jiayu of China reacts during the awarding ceremony after winning the gold medal of Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. (Xinhua/Du Yu)

Xu Jiayu (C) of China reacts during the awarding ceremony after winning the gold medal of Men's 50m Backstroke Final in the 18th Asian Games in Jakarta, Indonesia, Aug. 20, 2018. (Xinhua/Li Xiang)