Chisato Fukushima completed a sprint double at the Asian Games on Thursday, powering to a convincing victory in the women's 200 meters.
And Yuki Ebihara gave Japan its second gold of the day in athletics with a winning effort in the women's javelin.
Fukushima got off to a blistering start and was never in danger the rest of the way, coming home in 23.62 seconds to add to the 100-meter gold she won on Monday.
The 22-year-old Hokkaido native became the first Japanese woman ever to win both the 100 and 200 meters at the Asian Games.
"I think I've finally achieved something after winning both of my individual races," Fukushima said. "I felt like my feet weren't really moving late in the (200) race. I guess I was tired, but so was everyone else, fortunately."
Fukushima is bidding to pick up her third gold in the women's 4x100 relay on Friday.
"I didn't think about what had been written, like the first Japanese sprinter to do this and do that. I just wanted to capture gold," she said. "I feel relieved. Now all that's left is to win the gold with my teammates in the relay," she said.
Vietnam's Vu Thi Huong took the silver in 23.74 while Guzel Khubbieva of Uzbekistan won the bronze in 23.87.
Japan's Momoko Takahashi was sixth in 23.97.
Ebihara made a toss of 61.56 meters to set a new national record. Xue Juan and Li Lingwei of China took the sliver and bronze with 58.72 and 57.51, respectively.