Japan coach Mitsuttoshi Suzumura called it "a once-in-a-century-game."
Defeating powerful China 3-0 was thrilling enough. But to do it in the Olympics, in front of a crowd of 8,236 at Golden Park, scoring three runs in the bottom of the sixth made it memorable.
It was Japan's second thrilling victory in less than 24 hours. It scored three runs in the top of the seventh inning to defeat the Netherlands 3-0 Sunday.
Monday's victory over China boosted Japan's hopes of reaching the semifinals. China and Australia now each have one loss, and neither has played the United States.
Still, Suzumura was cautious.
"Since this is the beginning of the Games, I just think we have been fairly lucky things are going very well."
China pitcher Wang Lihong started despite working seven innings the day before against Australia.
In other action Australia blanked Tawain 4-0.