|Vietnamese tennis player Tat Thai Nguyen (Photo: VTF)|
Thai Nguyen, Quang Truong, and Khanh Duy all emerged victorious and will progress to the main round taking place on June 24.
Elsewhere, Duy lost out to a Chinese opponent while Minh Duc suffered a defeat by a rival from host-nation Thailand.
Fortunately, Nguyen and Truong were able to enjoy a successful day after recording wins over Huang Boyao of China and Kittin Aeb Iem of Thailand, respectively, with both scores finishing 2-0.
Nguyen will next play against number seven seed Hanchaikul of Thailand while Truong will face off against number 11 seed Inagawa of Japan in the second round.