Malaysia's Chong Wei Feng advanced to the quarter-finals of the Vietnam Open on Thursday after beating Koki Watanabe in straight games.
Having looked rusty against Lee Cheuk Yiu in the second round, Chong was much improved against Japan's Watanabe in the third.
The 11th seed wrapped up a 21-16, 21-12 victory in just 35 minutes to set up a quarter-final clash with another unseeded player, Indonesia's Shesar Hiren Rhustavito, who defeated countryman Wisnu Yuli Prasetyo 21-15, 21-9.
Fellow Malaysian and eighth seed Zulfadli Zulkiffli also moved on, wrapping up a straightforward 21-8, 21-9 victory over Thailand's Mek Narongrit.
He moves on to face fourth seed Wong Wing Ki Vincent of Hong Kong, who beat India's Aditya Joshi 21-11, 21-16.
Elsewhere, seventh seed Wang Tzu Wei of Taipei was knocked out, beaten 21-17, 17-21, 21-15 by Indonesian Evert Sukamta.
Sukamta faces countryman Firman Abdul Kholik next, after he beat Tan Chun Seang 21-14, 21-15.
India's Siril Verma was another winner on the day, 21-19, 21-15 over Loh Kean Yew.