Tuan claimed victory with a time of 6min 40.18sec, faster than Chen Po Han of Chinese Taipei (6:43.35) and Jun Seonghyun of the Republic of Korea (6:57.65).
On December 11 he won his first title in the 400m bi-fins event.
The juniors from Vietnam also won two silvers for the men’s squad in the 4x100m surface and Pham Thi Kim Thuong in the women’s 800m surface.
Nguyen Tien Dat took a bronze in the men’s 50m apnea and the women’s team came third in the 4x100m surface.
On December 11, Nguyen Thanh Loc completed his hat-trick at the 16th Asian Finswimming Championship with a third gold in the men’s 50m surface with a time of 15.65sec.
Kwon Namho and Lee Dongjin of the Republic of Korea came second and third, respectively.
Pham Duc Toan triumphed in the men’s 400m bi-fins (3:39.51).
