Thien crushed Sasongko 3-6, 6-2, 3-6, 6-4, 6-4 in three hours and 35 minutes.
In the other men’s singles matches, Ly Hoang Nam lost to Christopher Rungkat 4-6, 1-6, and then Nam withdrew from the third set due to his fatigue.
Thien and Nam bested Rungkat and Sunu Wahyu Trijati 3-1 in the men’s doubles match on March 5, which lasted 12 hours due to poor weather.
Also on March 4, Pham Minh Tuan lost to Rungkat 0-3, while Nam defeated David Agung Susanto 3-0.
Vietnam defeated Indonesia 3-2 to enter the event’s second round.