The Malaysian did that with a 14-21, 21-19, 21-15 win over Son Wan Ho, the in-form world number 11 from Korea, after being close to the exit at a game down and 15-17 and 17-18 down in the second.
In those difficult moments, Lee played his most controlled badminton, either deep to the back-line or tight to the net, and picked his moments perceptively to apply the sudden moments of pressure which took him to his sixth successive All-England Open final.
"Son played very well," admitted Lee. "I saw his match yesterday (when he beat the fifth-seeded Kenichi Tago) and I saw how well he was playing.
"But I am also playing well - playing well for myself, playing for my country, and also enjoying being at the All-England."
Lee was asked if his late-night match with Kento Momota of Japan, followed by a 1pm start today had affected his performance in the first half. When he lost 15 out of 20 points at one stage to relinquish the first game.