Egyptian Alaaeldin Abouelkassem, 21, had to settle for silver and not the gold he was really looking for - and looked like he might grab.
That went to China's world number nine Lei, who came from 13-12 down to win 15-13 after a day of shock results which included Britain's medal hope Richard Kruse heavily losing his first contest.
Bronze went to Republic of Korea's Choi Byungchul with a nail-biting 15-14 victory over Andrea Baldini, the 26-year-old Italian.
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