Kong, the world champion, was never seriously extended in scoring a 21-18, 21-9 victory over the 18-year-old Dragutin Surbek.
Italy finished runners-up in Group A to China, edging past Yugoslavia 3-2, thanks to two wins from the former mainland Chinese player Yang Min.
The quarter-final line-up was completed in the women's team event where four places were available following the automatic qualification of the elite group winners - China, South Korea, Germany and Romania. Hong Kong, bronze medallists in 1995, scored a 3-1 victory over Hungary while Sweden, Japan and North Korea also went through.
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