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0Since 2004, when the ASEAN Cup started applying the home-and-away format in the semi-finals and finals, no team that lost by two or more goals in the first leg has managed to reverse the outcome in the second leg to progress.
Over more than two decades, the ASEAN Cup has seen plenty of comebacks. However, the key point is that all teams that were trailing after the first leg and later advanced only had to overcome a one-goal deficit. Indonesia once lost 1-2 to Malaysia in the 2004 semi-final first leg but won 4-1 in the return leg. In 2014, Malaysia lost 1-2 at home to Vietnam and then stunned everyone with a 4-2 victory at My Dinh. Most recently, Thailand also overcame the Philippines after losing 1-2 in the 2024 semi-final first leg, thanks to a 3-1 win in the second leg.
Those cases show that a disadvantage after the first leg does not mean the end. But a two-goal deficit is a different boundary, as teams that lost the first leg by that margin have all failed to come back. For example, in the 2024 semi-final, Singapore lost 0-2 to Vietnam in the first leg and ended up with a 1-5 aggregate. In 2021, Vietnam lost 0-2 to Thailand in the semi-final first leg, and that remained the final aggregate. In the 2016 AFF Cup semi-final, Myanmar lost 0-2 to Thailand in Yangon and then lost 0-4 at Rajamangala. In the 2012 final, Thailand itself was helpless against Singapore, losing 1-3 at Jalan Besar, and a 1-0 win in the second leg was insufficient.

The immediate challenge for coach Tan Cheng Hoe is history. Photo: FAM
Both Malaysia and Vietnam have also faced such a scenario. Malaysia lost 0-2 to Thailand in the first leg of the 2014 AFF Cup final, and a 3-2 win in the second leg was not enough to overturn the result. In the semi-finals of 2007 and 2010, Vietnam were eliminated by Thailand and Malaysia respectively, following the pattern of losing 0-2 in the first leg and drawing 0-0 in the second leg.
The first team to be eliminated after losing by two goals in the first leg was Indonesia in the 2004 AFF Cup final. That year, they lost 1-3 to Singapore at Gelora Bung Karno, then lost 1-2 at Kallang Roar.