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The group stage proved that the crowds will come out for the home team at this tournament, so a lot of administrators are doubtless rooting for South Korea to extend its journey at the U-17 Men's U-20 World Cup for another round.
Fortunately for their hopes, this Korean U-20s squad is strong enough to hold its own with the top teams in the world, as it demonstrated with a second-place finish in a tough group. The roster has a potential star of the tournament in Lee Seung-woo: the sort of quick-witted, technically gifted player who can cut through an opposing team on his own - as he did against Argentina.
But Portugal has a talented roster too, just an under-performing one. If the Portuguese can start playing up to their full potential, they have a team that should be able to match any in the tournament. But the evidence for that is increasingly shaky: Portugal stumbled out of the group stage into this round thanks to a late own-goal that gave it a win over Iran.
Count South Korea as the favorite to advance, but if the team many suspect is lurking inside the Portugal roster actually shows up, the home team could be in for a surprise.
In the knockout rounds of the U-20 World Cup, games that are tied after 90 minutes go to extra-time, followed by a penalty shoot-out, if necessary.
Per livesoccertv.com, here's where to find the game if watching from the USA: