Japan's Women Olympics team went down to a 4-1 defeat at the hands of arch-rival United States in the Tri-nation International Friendly Tournament held at Halmstad, Sweden, reports the AFC official website.
Japan are participating in the tournament as part of the preparation for the London Olympics. Hosts Sweden are the third team in the tournament whom the Nadeshiko will face on Wednesday.
Commenting on the defeat Japan coach Norio Sasaki said: "Since we learned the weak points of our team in today's game, we can work on those parts before going to the Olympics."
Japan travel to London to looking to add Olympic gold to their 2011 FIFA Women's World Cup title and their 2010 Asian Games gold.
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