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Kazakhstan's Daniyar Yeleussinov beat American marine Jamel Herring 19-9 in the preliminary bouts of the light-welterweight division boxing.
Yeleussinov, 21, one member of a strong Kazakh boxing team benefiting from unprecedented investment in the sport in his homeland, clubbed Herring around the ring and fully deserved his victory.
Herring was magnanimous in defeat, admitting the better man won and adding: "I'm disappointed to have lost but as captain of the US team it's my duty to stay around and cheer them on. If I am down then my team is down."
Cuba's former world champion Roniel Iglesias Sotolongo also looked strong in the 64kg category, easing past Cesar Villarraga Aldana of Colombia 19-9, and Iran's Mendi Toloutibandpi looked strong dispatching Spain's Jonathan Alonso 16-12.
Another Cuban, Yosbany Veitia Soto, dazzled in the light-flyweight division, scoring the biggest win of the competition so far with a 26-4 triumph over the hopelessly outclassed Billy Ward of Australia.
Filipino teenager Mark Barriga - the shortest boxer in the competition at 5ft 2ins - also looks a real medal contender after a powerful performance earned him a 17-7 win over Italian Manuel Cappai.
Birzhan Zhakypov of Kazakhstan kept his nerve to edge Frenchman Jeremy Beccu 18-17, while India's Devendro Laishram stopped Bayron Molina Figueroa Molina of Honduras with 36 seconds remaining in round one.