Mexico became the first team to reach the knockout round of the World Cup on Thursday after a 1-0 victory over South Korea.

A howler from South Korea goalkeeper Kim Seung-gyu gifted a goal to Mexico's Luis Romo and proved decisive as 'El Tri' hung on to win a tense battle in Guadalajara.

The victory means Mexico are guaranteed to finish in top spot in Group A with a game to spare following South Africa's 1-1 draw with the Czech Republic earlier Thursday.

Finishing top keeps Mexico at home in the last 32 with a game against a third-placed team in Mexico City.

South Korea are second on three points, with the Czech Republic and South Africa also still alive on one.