Mauro Zarate scored in the 86th minute to give Argentina a 2-1 comeback victory over the Czech Republic to win a sixth Under-20 World Cup soccer title on Sunday.
Zarate's low shot through traffic from the edge of the penalty box handcuffed goalkeeper Radek Petr.
Sergio Aguero also scored for Argentina in the 62nd, two minutes after Martin Fenin gave the Czechs a 1-0 lead.
The Argentines have won five of the last seven tournaments and six of the 16 U-20 tournaments overall, taking the title in 1979, 1995, 1997, 2001, 2005 and now this year.
They have made it to the semi-finals eight times in 12 attempts and six times in their last seven appearances.
Reaching the final was the Czechs' best effort.
Aguero was named winner of the Golden Boot as the tournament's top scorer with six goals.
He also won the Golden Ball as the best player in a media vote, ahead of Argentina's Maximiliano Moralez and Mexico's Giovani Dos Santos.
Aguero, who played as a substitute in the final against Nigeria in 2005, became only the second player to play on the winning side in two U-20 finals. Portugal's Jaoa Pinto also did it in 1989 and 1991.
Earlier, Chile defeated Austria 1-0 to finish in third place, ending the tournament on a happier note than the post-game brawl that followed its semi-final loss to Argentina on Thursday.