Japan's reigning world champion Kento Momota needed three games before he reached the quarter-finals of the Badminton World Federation German Open.
The world number one battled past France's Brice Leverdez at the Super 300 World Tour tournament, winning 21-14, 17-21, 21-11 at the Innogy Sporthalle in Mülheim.
China's double Olympic champion Lin Dan was not so lucky as the fourth seed suffered a round two exit.
He lost to Denmark's Hans-Kristian Vittinghus who came from behind to record a 16-21, 21-19, 21-13 victory.
Second seed Chou Tien-chen of Chinese Taipei also competed over three games, beating Hong Kong player Lee Cheuk Yiu 21-17, 16-21, 21-8.
In the women's event, Japan's top seed also made the last eight as Nozomi Okuhara continued her progression.
The 2017 world champion faced a tough battle before ousting Denmark's Mia Blichfeldt 21-17, 23-25, 21-10.
Her biggest rival in Germany could be compatriot Akane Yamaguchi, the second seed who won 21-19, 21-14 today against Hong Kong's Cheung Ngan Yi.
Former world champion and third seed Ratchanok Intanon won an all-Thai clash 21-12, 21-16 against Nitchaon Jindapol.
The competition continues tomorrow.