The world number three trailed 14-12 to Leung, ranked 278 places below him, but scored the last three hits to progress.
Elsewhere in the early stages, with his Prime Minister Andrus Ansip in the audience Estonia's world number one Nikolai Novosjolov did not make it into the quarter-finals, going down 15-11 to the USA's 20th-ranked Seth Kelsey.
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