Mexico became the first team at the 2026 World Cup to secure a place in the knockout stage after defeating South Korea 1-0 in Guadalajara.
The match, played at the Estadio Akron, ended with a single goal from Luis Romo in the 50th minute.
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Romo scored his fifth international goal after a defensive mix-up between South Korea goalkeeper Kim Seung-gyu and defender Lee Ki-hyuk.
Manager Javier Aguirre made three changes to the starting lineup but resisted calls to start 17-year-old Gilberto Mora.
Goalkeeper Raúl Rangel made a remarkable double save late in the match to preserve the lead.
He parried a header from Cho Gue-sung and then gathered Yang Hyun-jun's follow-up attempt.
This was the first World Cup match Mexico has ever played in Guadalajara, though the stadium had visible empty seats in the corporate tier.
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Both teams lacked urgency, knowing a draw would practically secure progression after their opening victories.
The quiet atmosphere drew whistles from the crowd just before halftime during an extended spell of South Korean passing.
South Korea's preparations were disrupted when video emerged of two individuals making disparaging comments about Son Heung-min's military service.
The players refused to perform media duties two days before the match.
Son struggled against Mexico's offside trap and was substituted after failing to convert a rare chance.
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South Korea can still progress with a win or draw against South Africa in their final group match.
