Willy Blain, the French light welterweight world champion, has been knocked out of the boxing quarter-finals by Thailand's Manus Boonjumnong.
Boonjumnong, who won 20-8, received a motivational phone call from Thai King Bhumibol Adulyadej before the bout.
Oleg Saitov, Russia's two-time gold medal-winning welterweight, fared better with a 22-14 win over Uzbekistan's Sherzod Husanov.
Twelve semi-finalists are now known, with each guaranteed a bronze.
Cuban Yudel Johnson (light welterweight), Lorenzo Aragon (welterweight) and heavyweight Odlanier Solis all won their bouts.
Bulgaria's Boris Georgiev and Romania's Ionut Gheorghe also reached the light welterweight semi-finals.
Aragon, a two-time world champion, barely hung on for a 16-14 victory over Azerbaijan's Ruslan Khairov. He will
meet Korea's Kim Jung Joo in the semi-finals.
Saitov next must face Kazakhstan's Bakhtiyar Artayev, whose powerful victory over Ukraine's Viktor Polyakov was stopped in the third round with a 33-13 lead.
Solis pounded Venezuela's Wilmer Jose Vasquez 24-4 with his usual intimidating power to set up a semifinal match with Syria's Naser Al Shami, whose victory over
Azerbaijan's Vugar Alakbarov, a bronze medalist in Sydney, was stopped late in the fourth round.
Belarus' Viktar Zuyev will face Egypt's Mohamed Elsayed in the other heavyweight semi-final. Zuyev pounded American Devin Vargas 36-27, though Vargas fought on a sprained left knee.
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