Fifth-ranked Sweden put the pressure on almost immediately with three shots in the first eight minutes, while the Americans showed little sign of the stellar unbeaten run they have enjoyed since 2019.
Blackstenius converted in the 25th minute, rocketing a header past US goalkeeper Alysssa Naeher with an assist from Sofia Jakobsson. The goalie had five saves in the first half as a dominant Swedish forward line thrashed the Americans’ defences.
The addition of veteran midfielder Julie Ertz did little to revive the US in the second half, as Blackstenius again scored in the 54th minute, and midfielder Lina Hurtig heaped on more pain to giver her side a three-goal cushion midway through the second half.
The match was personal for Team USA – The Swedes famously knocked the four-time World Cup winners out of the Olympic tournament on penalties in the quarter-finals in 2016. But their much hoped-for revenge in front of 48,000 empty seats inside the Tokyo Stadium was not to be.
The United States next face New Zealand, while Sweden play Australia in the group stage on Saturday.