TOKYO—Sweden didn’t have to bunker down on defense against the Americans this time. Stina Blackstenius scored a pair of goals and the Swedes stunned the United States at the Olympics with a 3–0 victory Wednesday in the women’s soccer tournament. The Americans, ranked No. 1 in the world and the favorites to win gold in Tokyo, were riding a 44-match unbeaten streak heading into the match. But Sweden, ranked No. 5, has been the U.S. team’s nemesis of sorts in recent years. The Swedes bounced the Americans from the 2016 Rio de Janeiro Games in the quarterfinals, the earliest U.S. Olympic exit ever, by making a defensive stand. This April, Sweden played the United States to a 1–1 draw in Stockholm, which snapped a winning streak dating back to January 2019 when the Americans lost to France in the run-up to the World Cup. It was the U.S. team’s only …