Lee Zii Jia's run at the German Open came to an end in the semi-finals after a 13-21, 12-21 defeat to Kunlavut Vitidsarn on Saturday.
Lee's loss was uncharacteristic as he looked void of any vigour, idea, and firepower against the young Thai.
The Malaysian's best period in the 43-minute defeat came in the opening stages of the first game, as he and Vitidsarn traded points until 7-7.
Surprisingly, Lee faded off dramatically after that, failing to set himself for any attacking opportunities his game usually revolves around.
With his defence also almost non-existent, Vitidsarn was able to stroll to the first game win.
Any notion that Lee might mount a comeback in the second game evaporated within the first few minutes as he trailed 4-11 at the interval, with his opponent not putting a foot wrong to duly sealthe victory.
Lee might have his mind on his All-England defence next week from the body language of the defeat, but take nothing away from his three-time world junior champion opponent who beat him in consecutive times.
Lee next faces Kenta Nishimoto, who was beaten by Vitidsarn in the last eight, at the All-England.