Olympic champion Carolina Marin knocked out Japanese third seed Nozomi Okuhara on second-round day at the Badminton World Federation Indonesia Masters.
The Spaniard recorded a 21-13, 21-15 victory to reach the quarter-finals at Jakarta's Istora Gelora Bung Karno.
Rio 2016 gold medallist Marin missed eight months of last season with a knee injury and has yet to climb back into the seeded positions, presenting the possibility of heavyweight clashes in the early rounds of tournaments.
She proved too strong for the 2017 world champion, as she continued her resurgence in Tokyo 2020 Olympic Games year.
It was not a good day for Japan's women at the World Tour Super 500 competition, as second seed Akane Yamaguchi was also knocked out.
Nineteen-year-old Wang Zhiyi did the damage, with China's Youth Olympic Games silver medallist coming from behind to pull off a fine 17-21, 21-11, 26-24 victory.
Thailand's fourth seed Ratchanok Intanon, a former world champion, advanced against compatriot Busanan Ongbamrungphan 21-16, 22-20.
Denmark's hero Line Kjærsfeldt was knocked out, however, failing to back-up her surprise first-round win over China's top seed Chen Yufei yesterday.
She went down 21-11, 21-14 to American Beiwen Zheng.
Denmark's fourth seed Anders Antonsen is the top-ranked player left in the men's draw and the World Championship runner-up booked his last eight spot by beating Japan's Kenta Nishimoto 23-21, 4-21, 21-13.
His team mate Viktor Axelsen, the fifth seed and 2017 world champion, also made it through by beating home Indonesian player Shesar Hiren Rhustavito 21-17, 21-14.
There is still Indonesian interest, however, as their sixth and seventh seeds made it through.
Asian Games champion Jonatan Christie, ranked sixth, beat Chinese Taipei's Wang Tzu-wei 21-15, 21-15.
Seventh seed Anthony Sinisuka Ginting saw off compatriot Tommy Sugiarto 21-16, 21-15.
The tournament, the second of the World Tour season, continues tomorrow.