So we can't advance unless the Czechs collapse, and we catch fire? Doesn't seem likely in a 4-team bracket.
The US is playing now for second in the group, with Italy, Ghana. The best case scenario has the Czechs winning the group, beating Italy.
But if Italy wins against Ghana today, and they are up 1-0 at halftime. The US is going to have to beat Italy outright, if they are to have a chance to advance.
And if they do advance, they most likely would have to face Brazil in the round of 16.