Mongolia's Tutstsogt Nyambayar produced a shock win over world champion Misha Aloian to reach tomorrow's Olympic flyweight final, while Britain's Freddie Evans and Anthony Joshua will also be boxing for gold.
Welterweight Evans and super heavyweight Joshua won semi-final bouts yesterday to make it three Britons in the weekend's 10 Olympic finals.
Bantamweight Luke Campbell is in Saturday's final and after Nicola Adams won women's flyweight gold on Thursday, the Brits are enjoying success in the ring.
Meanwhile Nyambayar is earning a reputation as a giant killer at the ExCel Arena with victories over three seeded boxers en route to his final. That included a 15-11 victory over Aloian.
"Mongolians have a big heart and I intend to fight with a big heart," he said ahead of Sunday's flyweight (52kg) final against Cuba's 19-year-old Robeisy Ramirez after the Cuban's 20-10 win over Ireland's Michael Conlan.
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Mongolian athletes have won four medals so far in London -- one silver and three bronze -- and Nyambayar says he wants to complete the colours for his country.
In the 60kg lightweight division, world champion Vasyl Lomachenko of Ukraine who reached Sunday's final with a tough 14-11 semi-final win against Cuba's Yasnier Toledo.
He will face South Korea's Han Soon-Chul who beat Lithuania's 20-year-old Evaldas Petrauskas in the other semi-final.
Welsh welterweight (69kg) Evans booked his place in the gold-medal bout when he enjoyed a nervy 11-10 win over Ukraine's world champion Taras Shelestyuk.