Lloyd Glasspool and Julian Cash closed in on a slice of Wimbledon history but fellow Briton Joe Salisbury suffered mixed doubles disappointment on Thursday.
Glasspool and Cash reached the final of the men's doubles by beating Spain's Marcel Granollers and Horacio Zeballos of Argentina 6-3 6-4.
The British duo have enjoyed an incredible season on the grass with titles at Queen's Club and Eastbourne, and with their winning run standing at 13 matches.
They become the first all-British team to make the men's doubles final at the Championships for 65 years - and on Saturday will be aiming to be crowned as the first title winners since 1936.
"It was a really good match, really clean, really clinical," said Glasspool after the semi-final.
"Everything went to plan and went our way, but I do think we still have a few more things we can iron out and mistakes we can get rid of. But to replicate that again would be good."
They face Australian Rinky Hijikata and Dutchman David Pel in the final, hoping to go one better than compatriot Salisbury.
Salisbury and Brazilian partner Luisa Stefani lost the mixed doubles final to Dutchman Sem Verbeek and Czech Katerina Siniakova 7-6 (3) 7-6 (3).
The pair only entered at the last minute after Salisbury's original partner, Jodie Burrage, suffered an ankle injury.
Salisbury said: "It's always tough to lose a final, especially one so close as that. Sem and Katerina played amazing, so congratulations to them. They were too good for us in the tie-breaks today.
"I've got to say a big thank you to Luisa. She's been amazing. Thank you for texting me two days before the sign in to ask to play with me. It's been a pleasure to play with you all week and hopefully we can again."
In the juniors competition, 17-year-old Mimi Xu beat French Open girls' champion Lilli Tagger of Austria 7-6 (4) 6-1 to reach the semi-finals.
"It's my last year of juniors and I'd never made it past the third round, it means so much," said Xu, who lost the all-British first-round clash with Emma Raducanu in the main draw.
"I lost to Emma but it was competitive. It's such great preparation for junior Wimbledon by playing senior Wimbledon."
Fellow Briton Hannah Klugman, who was beaten by Tagger in the Roland Garros final, lost in straight sets to American Julieta Pareja.
Alfie Hewett and Gordon Reid, Britain's 22-time Grand Slam winners, are once again through to the men's wheelchair doubles final where they will face Spain's Martin De La Puente and Dutchman Ruben Spaargaren.
