Argentina, Mexico, Nigeria and Chile advanced to the quarterfinals of the Under-20 World Cup with victories on Thursday.
Argentina beat Poland, 3-1, with the last two goals coming from Atletico Madrid's Sergio Aguero. Angel Di Maria scored Argentina's first goal after the Poles had taken the lead on a goal by Dawid Janczyk in the 33rd minute.
Mexico beat Congo, 3-0. Star Giovanni Dos Santos scored on a penalty kick in the 23rd minute, and Omar Esparza and Pablo Barrera added insurance goals late in the game.
Arturo Vidal scored to give Chile a 1-0 win over Portugal and will face Nigeria, a 2-1 winner over Zambia on goals by Uwa Echiejile and Chukwuma Akabueze.