Doubles pair Chris Langridge and Marcus Ellis became the first Team GB badminton players to reach an Olympic semi-final since Athens 2004 while Rajiv Ouseph became the first British man to reach an Olympic singles quarter-finals in the sport.
Langridge and Ellis were first up as they beat Japan's Hiroyuki Endo and Kenichi Hayakawa in straight sets with an impressive 21-19, 21-17 win.
The duo now face China's Fu Haifeng and Zhang Nan in the semi-final on Tuesday and have a chance to secure Team GB's first Olympic badminton medal since Nathan Robertson and Gail Emms won mixed doubles silver in Athens 12 years ago.
“It’s insane really,” said Langridge. “If you’d have said to me at the start of the Games you’d make the semi-finals I’d have bitten your hand off.
“We’re one of these pairs that are kind of a bit up and down. One match we’ll play well and take out a top ten then next match we’ll probably lose against someone similar to us. But this tournament we’ve shown our ability throughout the whole Games.
“We are so dangerous when we play well.”
In the evening session, Rajiv Ouseph moved into the men's singles quarter-finals as he beat seventh seed Tommy Sugiarto 21-13 14-21 21-16.
The 29 year old will next play European champion Viktor Axelsen after the Danish fourth seed beat Ireland's Scott Evans 21-16 21-12.
“It was very tense but I thought this could be my last match here so I just wanted to give it everything out there and it worked well,” said Ouseph.
“Hopefully I can raise the profile of singles badminton in Britain. Doubles has always been at the forefront of British badminton so if I can get anyone playing singles I would be more than happy with that.”