Nigeria have qualified for the U-20 World Cup quarter-finals with a crucial 1-0 victory over South Korea. A goal from Olarenwaju Kayode gave the Flying Eagles their sixth point to join leaders Portugal to the knockouts after the latter thrashed Cuba 5-0. Korea, on four points, are also likely to be through as one of four third-placed teams. In Group A, Ghana grabbed a massive 4-1 victory over USA, courtesy of a brace from African Youth Championship star Ebenezer Assifuah. As Spain and France qualified, the Ghanaians finished third on three points and a zero goal difference. African champions Egypt still have a slender chance to go through if they managed to beat England by two goals. Nigeria 1-0 Korea Ghana 4-1 USA