Nhat won 30-27 after three rounds, with feverish support from home fans at East Sea Park.
Vietnamese Bui Thi Hai Yen got one more gold for Vietnam when she beat Thailand’s Wankhruea Chenchira in the women’s lightweight (57-60kg) class.
Bui Yen Ly won gold too when she beat Thailand’s Srisalai Nitiyakorn 30-27 in the women’s flyweight (48-51kg).
Thailand’s Pinthong Phitsanu beat Singapore’s Tee Bryan in the men’s Light Flyweight (45-48kg) final, taking the gold for Thailand.
In three-a-side basketball, Vietnam’s women’s team beat Chinese Taipei 20-18 in the women’s preliminary.
Tran Thanh Lam and Nguyen Thanh An defeated Chinese Taipei’s Lin Yi Chao and Liao Po Yu in jujitsu duos with a score of 38.5-34.5 the same day.
After three days of competition at the ABG5, Thailand took the lead in the medal table with fifteen gold, eight silver and eleven bronze medals.
Vietnam followed with nine gold, twelve silver and eighteen bronze while China came in third place with five gold, five silver and eight bronze.