Lee Zii Jia put on one of the finest performance of his career to demolish Kento Momota 21-16, 21-19 to book a place in the All England Open semi-finals.
The straight game victory, fully deserved in just under an hour, was one of aggression and composure that left the world number one flat-footed and reeling at times.
Fans could be forgiven for not giving the young Malaysian much hope against Momota, who was just returning to competitive action after over a year absence.
Despite that, the Japanese had won his first two All England encounters comfortably and Lee was expected to face a difficult time.
But Lee, who had flattered to deceive in the last few tournaments, came out all guns blazing.
He dictated the tempo from the offset, forcing Momota into some desperate defending and always looking to kill off the rallies with his forehand smashes directed at the pocket corners of the court.
The world number 10 dominated to clinch the first game 21-16. Buoyed with confidence, he continued in the same relentless fashion in the second game.
Momota did well to claw back to 19-19 after trailing by three points, but Lee kept his cool to convert the two remaining point for a priceless victory.
With that, he claimed a maiden victory over the reigning world champion in seven attempts and checked into the semis for a showdown against Dutchman Mark Caljouw.
Chan Peng Soon-Goh Liu Ying joined Lee in the last four after a gritty 17-21, 21-18, 22-20 victory over the in-form French pair Thom Gicquel-Delphine Delrue.
The world number seven were pressed hard in several long rallies, but used their experience to prevail in 66 minutes.
They next face Japan's Yuki Kaneko-Misak Matsutomo for a place in the final.
Tan Kian Meng-Lai Pei Jing meanwhile saw their run end after a 17-21, 9-21 defeat to second seeds Yuta Watanabe-Arisa Higashino.
It was also the end of the road for women's doubles M.Thinaah-Pearly Tan, who went down fighting 21-12, 20-22, 16-21 against Japan's Nami Matsuyama-Chiharu Shida.