Women's singles top seed Nozomi Okuhara of Japan crashed out of the Badminton World Federation Indonesia Masters as she suffered a straight games defeat to China's Chen Xiaoxin in Jakarta.
Chen proved too strong for the 2017 world champion and progressed to the second round with a 21-18, 21-17 victory at the Gelora Bung Karno Sports Complex.
The Chinese player, a junior world mixed team champion in 2014, will face Indonesia's Ruselli Hartawan in round two.
Okuhara was one of the only seeded players to fall in either the men's or women's tournaments as the top seeds in attendance enjoyed a largely dominant day.
Men's third seed Chou Tien Chen was the other high-profile casualty as the Chinese Taipei player was beaten 21-13, 21-13 by Lee Zii Jia of Malaysia.
Kento Momota, the reigning world champion and top seed in the men's singles event, beat Denmark's Jan O Jorgensen 22-20, 21-11 to book his place in the next round.
Momota's reward is a meeting with another Dane as he will play Hans-Kristian Solberg Vittinghus tomorrow.
Reigning Olympic champion and fourth seed Chen Long is also through after he dispatched India's Sai Praneeth Bhamidipati 21-12, 21-16.
Kantaphon Wangcharoen of Thailand awaits for the Chinese star in the next round.
In the women's competition, fourth seed Akane Yamaguchi succeeded where her Japanese team-mate had failed but needed three games to oust China's Han Yue 21-16, 15-21, 21-16.
Olympic gold medallist and world champion Carolina Marin of Spain joined Yamaguchi in the second round after she defeated Zhang Yiman of China 21-14, 21-8.
The World Tour Super 500 event continues tomorrow.