China's Wang - a two-time winner of the Badminton World Federation tournament in Odense - was too good for Zetchiri 21-12 21-10, to see the third seed safely through to the last 16.
The only seeded casualty in the women's draw was sixth seed Bae Yeon Ju of South Korea, who suffered a 21-14 21-15 loss to Thailand's Busanan Ongbumrungpan.
Top seed Li Xuerui got safely past Thai Porntip Buranaprasertsuk 21-15 21-12, while her fellow Chinese and second seed Wang Shixian was too good for Chinese Taipei's Pai Yu Po 21-15 21-15.
South Korean fourth seed Sung Ji Hyun downed Scotland's Kirsty Gilmour 21-17 21-11, fifth-seeded Thai Ratchanok Intanon eased past Estonia's Kati Tolmoff 21-13 21-12 while Indian seventh seed Saina Nehwal came from behind to beat German Karin Schnaase 12-21 21-10 21-12.
Russia's Ksenia Polikarpova won the day's longest match in the women's event taking 58 minutes to see off local hope Mette Poulsen 13-21 21-10 21-18.
Japanese quartet Eriko Hirose, Minatsu Mitani, Akane Yamaguchi and Sayaka Takahashi all progressed with two-game wins.
Others to progress to the second round included India's Sindhu PV and Taipei's Hsu Ya Ching.
In the men's draw, Chinese second seed Chen Long and Danish third seed Jan O Jorgensen both had straight-games wins.
Chen beat local Viktor Axelsen 21-17 21-10 while Jorgensen beat German Marc Zwiebler 21-11 21-16.
Seventh seed Son Wan Ho of South Korea ran past Hu Yun of Hong Kong 21-17 21-8, while fifth seed Tommy Sugiarto, sixth seed Wang Zhengming and eighth seed Hans-Kristian Vittinghus all lost.
Indonesia's Sugiarto fell to China's Tian Houwei 21-14 21-14, Wang was outmuscled by Indonesia's Dionysius Hayom Rumbaka 17-21 21-18 21-19 and Vittinghus lost a 68-minute thriller to Frenchman Brice Leverdez 24-22 16-21 21-18.
Other first-round winners included India's Kashyap Parupalli and Srikanth K, South Korea's Lee Donk Keun, Thai pair Boonsak Ponsana and Tanongsak Saensomboonsuk, China's Yuekun Chen and Japan's Kento Momota.