Vietnam's Pham Tuan Hai scored in the eighth minute, before Ben Davies equalized 20 minutes later.
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60'
Vietnam made two more substitutions, with Nguyen Quang Hai and Do Duy Manh coming on.
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54'
Hoang Duc dribbled from left to right, passed three players and then made a pass to Tien Linh, who quickly lost the ball. Duc has been a key player for Vietnam in the midfield.
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52'
Peeradon Chamratsamee made a chip pass from the midfield to Gustavsson, who entered the penalty area and was ready to finish with his head. The Swedish-born striker didn't get a good touch on the ball and headed it over the bar.
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Patrik Gustavsson (number 9) enters Vietnam's box. Photo by Hieu Luong
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48'
Like the first half, the second half started at a slow pace, with Vietnam dropping deep to protect their lead.
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46'
Second half underway
Both teams made no substitution after the break.
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Thailand First-half stats Vietnam 5 Shots 6 2 Shots on goal 1 67% Possession 33% 1 Yellow cards 2 0 Corners 2 -
45'+7
End of first half
The score is 1-1 after the first 45 minutes. Vietnam scored first with Pham Tuan Hai's goal but Thailand equalized thanks to Ben Davies.
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45'
The first half has seven additional minutes.
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40'
Thailand are putting immense pressure on Vietnam after scoring the equalizer.
In the first leg of the final, Vietnam beat Thailand 2-1 at Viet Tri Stadium thanks to a brace from naturalized striker Nguyen Xuan Son. The only goal of Thailand was scored by center-back Chalermsak Aukkee near the end of the match.
The away goal rule is not used in ASEAN Cup this year. That means Vietnam will enter the match with a one-goal lead, while Thailand will have the home advantage.
Xuan Son is aiming for the player of the tournament and top scorer awards, having already scored 7 goals in 4 matches. If Vietnam win the title, he is likely to receive both of the awards.