I dont know why you underestimate Saudi when it comes to tough matches.This is youth football for your knowledge not the professional football.In youth football no 1 is favourite even if its a 3rd tier nation or 1st tier nation.Just take for instance,Guatemala, no body on earth thought that they will be beating Croatia and advance to round of 16. I just had watched some few minutes of repeat telecast of Saudi-Nigeria match.In my sense,the team did not deserve to lose.The players must see to it that all chances created are converted to goal.