The Chinese Taipei player defeated India's K. Ajay Kumar 21-9, 21-15 in the first round at the Nguyen Du Stadium.

Hsu is playing at the tournament, a Grand Prix Gold level event, after being part of the mixed team gold medallists at his home Summer Universiade in Taipei last month.

The biggest casualty on day one was Thailand's fourth seed Zulfadli Zulkiffli, who was knocked out by another Taiwanese player in Lin Chia-hsuan.

Lin came through 21-18, 21-12.

Vietnam's top-ranked home player is ninth seed Nguyễn Tiến Minh, who is safely into the next round.

He defeated Wisnu Yuli Prasetyo of Indonesia 21-6, 21-14. 

With second seed Sourabh Verma of India withdrawing before the start of play, Khosit Phetpradab could be the nearest challenger to Hsu.

Thailand's third seed needed three games to reach round two, eventually defeating Lim Chi Wing of Malaysia 23-21,16-21, 21-15.

The women's draw is due to begin in Ho Chi Minh City tomorrow.