The SAR player, ranked 30th in the world, needed one hour and 19 minutes to prevail 17-21, 21-16, 21-18 at Indira Gandhi Indoor Stadium.
The hard-fought victory sets up a meeting with ninth-seeded Alex Lainer of France, with a spot in the quarter-finals on the line.
Ng, who won the German Open three years ago, is the only Hong Kong player remaining in the men’s singles competition, with Lee Cheuk-yiu having bowed out in his last 32 encounter on Wednesday.
The Badminton World Championships run until this Sunday.






