Argentina took the world Under-20 championship for the sixth time, coming from behind to beat the Czech Republic 2-1 on Sunday.
The Czechs took the lead on the hour through a brilliant strike from Martin Fenin.
Argentina drew level a couple of minutes later through Sergio Aguero - who was also the tournament's top scorer with six goals.
The game looked to be heading for extra-time until Zarate cut in from the left and beat Czech keeper Radek Petr at the near post with a fierce shot from the edge of the area.
The Argeys were worthy winners but they were diving at every chance they got.The south americans are the worst divers in all of soccer.Only when the referees get the guts to card them will it stop.