Malaysian top seed Lee Chong Wei beat Dane Peter Gade 21-17 21-14 to make the final of the All England Championships for the second successive year.
Chong Wei faces unseeded Kenichi Tago in Sunday's final as the Japanese beat China's Bao Chunlai 18-21 22-20 21-18.
In the women's singles, 2008 champion Dane Tine Rasmussen edged out Indian seventh seed Saina Nehwal 21-19 21-17.
Rasmussen can avenge last year's final loss against China's Wang Yihan, who beat compatriot Wang Xin 21-17 26-24.
Gade had matched Chong Wei early on in the opening set but the Malaysian eventually stretched into a 17-11 lead which proved too much for the Dane.
In the second, Chong Wei took control at 15-13 in front as Gade had no reply for the world number one's cross-court smashing and neat net work.
Chong Wei, chasing his third Super Series win of the year at the National Indoor Arena in Birmingham, said: "I'm really pleased to make the final. It's very important for Malaysian badminton. We've not had anyone there for a while."
Chong Wei, 33, lost last year's final to world and Olympic champion Lin Dan but the Chinese second seed was knocked out in Friday's quarter-finals by Chunlai.
The men's doubles final, meanwhile, will be an all-Danish affair for the first time since 1967.
Matthias Boe and Carsten Mogensen beat China's Guo Zhendong and Xu Chen 21-16 21-16 to set up a meeting with Lars Paaske and Jonas Rasmussen, who defeated third seeds Markis Kido and Hendra Setiawan of Indonesia 14-21 21-13 23-21.
World and Olympic champion Lin Dan of China lost his All England title on Friday night, downed in a major upset 21-16 18-21 21-17 by sixth-seeded compatriot Bao Chunlai in the quarter-finals.
Lin has contested the last six All England Badminton finals, winning four of them, but had no answer to his fellow left-hander.
Seeded two - behind Lee Chong Wei of Malaysia, who now looks clear favourite to land his first All England title after his rival's exit - Lin looked to be on his way to victory in the decider when he led 11-7 but a losing run of six points in succession turned the tables.
A confident Bao raced to 20-15 with some stunning winners and although Lin saved two match points, a smash down the line that was just out handed victory to his opponent.
Lin had been making his seasonal debut in the tournament after missing the first two Super Series of the year but has looked in good shape.
"Bao was playing really well today but I was okay too. I thought I had a chance," he said.
Doubles specialist Anthony Clark started day two of the All England Open berating his defeat with partner Nathan Robertson in the men's event but, along with partner Heather Olver, ended it by becoming the first English pair through to the quarter-finals in Birmingham.
Such is the strength of this 100th Badminton Championships, experience is telling here but the English pair, playing only their second major tournament, tore up the doubles manual to record a superb 21-18, 22-10 win in 33 minutes over Chinese Taipei’s Sheng Mu Lee and Yu Chin Chien.