In the opening match on October 10, Soeda Go of Japan beat Indonesia’s Christopher Rungkat.
The host country’s Ly Hoang Nam will play against Maxime Tabatruong of France while Nguyen Hoang Thien is to take on Sekiguchi Shuichi of Japan on October 11.
The tournament is seeing the participation of players in the top 55 of the ATP Challenger Rankings.
Prize money at the tournament totals US$50,000 and the winners of both singles and doubles titles will receive 90 bonus points.
Earlier in the qualification round, N. Vijay Sundar Prashanth and Sanan Singh of India, Sekiguchi Shuichi of Japan and Laurent Rochette of France beat 50 other players to qualify for the main round.
Twenty-eight other players received wild cards to the main round.