Japan's women shocked an undefeated U.S. team packed with WNBA players on Tuesday as 3x3 basketball wound down to the elimination stage at its Olympics debut.
Mai Yamamoto led with eight points, including a critical two-pointer with about a minute left to put her team ahead. Japan advanced to 5-2 and second place in the pool round.
Japan head coach Torsten Loibl said the victory was significant to show his team was ready for the knock-out stages.
"It's not important to win or lose, but it's a message," he said from the stands moments after the final whistle sounded.
A late penalty gave Team USA 1.1 seconds to tie the game with a two-pointer. But Japan's Stephanie Mawuli blocked an attempt from Las Vegas Aces guard Kelsey Plum, sealing the 20-18 upset.
Light rain fell on the Aomi Urban Sports Park in Tokyo as a typhoon approached Japan's main island, offering some respite from three days of searing heat.
After final pool matches Tuesday afternoon, four teams will move ahead to quarterfinal matches in the evening. The U.S. women and the top-seeded Serbia men have secured their spots in the semifinals on Wednesday, which will also feature the medal matches.
With its Olympic debut, 3x3 is looking to boost its global profile as a faster-paced, more compact alternative to traditional basketball.
Enhancing that atmosphere, DJs play hip-hop music throughout 3x3 games — in keeping with the sport's urban roots.