Rio Olympic bronze medalist Nozomi Okuhara defeated Akane Yamaguchi 2-1 in an all-Japanese women's singles final at the World Super Series Australian Open on Sunday, when both Japanese doubles pairs also triumphed.

It was the first time Japanese had won three of the five draws in a super series event.

Okuhara, who has been struggling with a right shoulder injury after the Olympics, prevailed 21-12, 21-23, 21-17 over the third-seeded Yamaguchi at Sydney Olympic Park to capture her fourth Super Series title.

"I am delighted," said Okuhara, whose win came on the same day her hometown of Nagano in central Japan was rattled by an earthquake. "There was an earthquake in Nagano Prefecture so I wanted to deliver some good news. We were able to show a high quality game between Japanese players."

Yamaguchi couldn't play her high-tempo game with Okuhara returning high and deep into her court, and admitted mistakes also had led to her downfall.

"I made a lot of them but played quite well in the third game. I want to make sure I don't lose focus in events like the world championships," she said.

In the women's doubles, Japan's Rio gold medalists Misaki Matsutomo and Ayaka Takahashi were victorious over Denmark's Kamilla Rytter Juhl and Christina Pedersen 21-10, 21-13 in a repeat of last summer's games final in Brazil.

"I'm pleased to win a Super Series title. We want to step up a level toward the world championships (in August)," said Matsutomo.

Matsutomo and Takahashi lost against the second-ranked Danes in October's Japan Open final.

"We were clearly making them move (with our combinations today)," said Matsutomo.

The Japanese pair bounced back from an early exit at last week's Indonesian Open to secure their eighth Super Series title.

"We sorted ourselves out after the first-round loss in Indonesia," said Takahashi, who in Saturday's semifinals defeated China's fourth-ranked Chen Quigchan and Jia Yifan who had beaten them in a tournament in May. "I wanted to beat the Chinese pair. It's really great to be able to come through the semis yesterday and the final today."

Third ranked Takeshi Kamura and Keigo Sonoda wrapped things up for Japan by defeating Hendra Setiawan of Indonesia and Boon Heong Tan of Malaysia 21-17, 21-19 in men's doubles.

"We played a game that we can build on ahead of the worlds," Kamura said. "The two of us want to work so we can secure a medal (there)."