United States forward Megan Rapinoe said they "got bopped" and did "dumb stuff" as they lost their opening match to Sweden at the Olympic Games.
The world champions were stunned 3-0 in Tokyo with striker Stina Blackstenius scoring twice, before substitute Lina Hurtig added a third for Sweden.
It ended a run of 44 games unbeaten for the USA coming into the Olympics.
"I thought we were a little bit nervous, a bit tight, doing dumb stuff," Rapinoe said.
Sweden were without Chelsea captain Magdalena Eriksson, while the USA started with key players Rose Lavelle, Sam Mewis, Alex Morgan, Tobin Heath and Lindsey Horan.
The USA were knocked out by Sweden, who went on to win silver, on penalties in the quarter-finals five years ago.
US coach Vlatko Andonovski added: "It's obvious we put ourselves in a big hole, but we're the only ones who can get ourselves out of it.
"It's not going to be easy. We've got to get positive results in the next two games, but the fact there is still a chance [means] I know this team is not going to give up."
Elsewhere, veteran striker Marta scored twice as Brazil thrashed China 5-0.
Marta became the first player to score in five consecutive Olympics, taking her total tally to 12, while 43-year-old defender Formiga extended her record of competing in all seven women's Olympic tournaments since women's football was introduced in 1996.
Team GB got off to a winning start thanks to a double from Ellen White as they comfortably beat Chile 2-0 in their Group E opener.
Latest Stories
-
Ghanaian students gear up for Robotics World Championship
12 mins -
Political interference makes public sector managers appear incompetent – Dr Manteaw
18 mins -
Police arrest truck driver alleged to have caused train crash
23 mins -
CAF Confederation Cup: Dreams FC depart to Cairo ahead of semis first leg against Zamalek
26 mins -
Liverpool exit Europa League despite 1-0 win over Atalanta
32 mins -
Roma beat Milan to set up Bayer Leverkusen clash in Europa League semis
36 mins -
Mohammed Kudus’ West Ham suffer Europa League elimination
40 mins -
Madam Joyce Oparebea Mintah Addae
55 mins -
Fiscal deficits and debts to remain high over medium term – IMF
1 hour -
Kenyan military chief among 10 people killed in helicopter crash
2 hours -
Insinuating Bagbin is not heeding calls for recall because he is NDC unfounded and unfortunate – Parliament
3 hours -
Ashanti, Nelly are engaged and expecting a baby
4 hours -
New Ghana train on test run involved in accident
4 hours -
World Bank, AfDB partner to provide 300m African’s with electricity access
4 hours -
Ghana wins preliminary ruling in Cassius Mining’s $300m international arbitration
4 hours