Germany and USA, having four points each, are facing each other and both sides need a point to be mathematically certain of progressing to the knockout stage. Ghana meet Portugal, both sides having one point so far, and Portugal are in a situation that they not only have to win but have to do so with a substantial goal difference. Depending on the other match, they might need to win by four goals.
Germany have been impressive in the opener against Portugal, winning 4-0, and then underperformed in the second round, at least according to those who are unaware Germany always fail to perform in the second round. The Germans have now won only one of their last eight second-round matches. with the third round they do not have a problem.
USA coul have already qualified if they kept the 2-1 lead against Portugal, as they'd have six points, but now they're in a situation where they again need to overperform and at least take a point off huge favorite.
Portugal have kept themselves in the tournament with a 95th minute strike which tied the score to 2-2 against USA inthe second round. If Portugal lost that match they'd get eliminated, and now they got a slim chance of progressing. Ghana have been impressive against Germany in the second round and won a point. since they were unlucky to lose the opening match against USA, they now have to beat Portugal and if they do they're very likely to qualify. The Black Stars would be the second African team in the round of 16 as Nigeria have already qualified and Ivory Coast suffered a heart breaking loss to Greece.