Vietnam's Under-23 squad scored a 3-1 upset against Baharain in their Group B opener at the 16th Asian Games at Guangdong People's Stadium, on Monday.
The Vietnamese youths scored one goal in the first half and another two goals in the second before Bahrain pulled one back in the final minutes.
Before the event began, coach Phan Thanh Hung and the Vietnamese U23s said they believed they could advance to the second round.
The impressive win over Bahrain certainly made for a good start.
The two top squads, in each of the tournament's six groups will advance to the second round along with the four third-place teams with the best results.
The Vietnamese U23s will clash with Turkmenistan in their next game on Wednesday before facing off against Iran on Friday.
In the other Group B match on Monday, Iran thrashed Turkmenistan 4-1 to come out on top of the group.
In Group A, Malaysia defeated Kyrgyzstan 2-1 while hosts China lost 0-3 to Japan.
In Group C, North Korea beat South Korea 1-0 while Palestine and Jordan fought to a scoreless tie.
On Sunday, Kuwait beat India 2-0 while Qatar drew 0-0 with Singapore in Group D; and in Group E, Uzbekistan hammered Bangladesh 3-0. The U.A.E drew 1-1 with Hong Kong.
In Group F, Oman defeated Maldives 3-0 while Thailand crushed Pakistan 6-0 with Thong Lao and Teerasil Dangda each scoring a double.