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Sweden showed how limited their potential is even in the OG qualifying tournament in March. Only three goals total against Switzerland, Norway and Netherlands still got them to Rio, and they scored two goals in the group phase here, with one win (1-0 against South Africa) and one defeat (1-5 against Brazil), and a tie against China 0-0. Their statistics are even worse, they had 10 shots on target, only three against China.
When it comes to their duels against USA, who won the gold in London and are the biggest favorite for gold here in Rio, they played many games. Since 2010, they played ten times, USA won four times, Sweden three, and three were ties. The last three games ended under, it was 1-1 for US and 1-0 for Sweden in 2013 and 2014 in the Algarve Cup in Portugal, and 0-0 in the WC in Canada, in the group phase. Sweden had four shots then, not one of them on target, the Americans had five shots, two on target.
Let's also mention that the conditions aren't that great in the Estadio Nacional Mane Garinncha stadium, since this will be the ninth game in nine days there. That would probably suit the Swedish defensive style better. That could be changed if the US score a goal early, but the Americans don't really allow goals even in situations like those. Not counting the last game of the group phase against Colombia (2-2), when the US already secured the first place of the group, in two matches against France and New Zealand, the opponents weren't even close to scoring a goal. The expected result is 1-0 or 2-0 for USA, and them getting placed to the semis.