Olympic and world champion Lin Dan and world number-two Chen Long crashed out of the quarter-finals of the Japan Open Friday, leaving a shocked China out of the men's tournament.
Lin, who has two Olympic, five world and five All-England titles under his belt, lost 19-21, 21-13, 16-21 to Denmark's European champion Jan O Jorgensen in a major setback after returning to competition following a seven-month sabbatical.
Second-seeded Chen lost to Hu Yun 21-18, 19-21, 15-21 in his first defeat by the Hong Kong player in their six encounters.
Top-seed and world number-one Lee Chong Wei of Malaysia struggled against Tommy Sugiarto of Indonesia before winning 21-15, 12-21 and 21-17.
In the other men's quarter-final, Japan's Kenichi Tago outlasted another Dane, Hans-Kristian Vittinghus, 21-16, 16-21, 21-13.
Lee faces Tago and Jorgensen takes on Hu in the semi-finals on Saturday.
In the women's quarter-finals, Olympic champion and top-seed Li Xuerui of China outclassed Spain's Carolina Marin 21-14, 21-12.
In the semi-finals, Li faces South Korea's Sung Ji-Hyun who beat Porntip Buranaprasertsuk of Thailand 13-21, 22-20, 21-11.
Taiwan's Tai Tzu-ying stopped Sayaka Takahashi as the Japanese was injured when she was trailing in the second game 6-11 after losing the first 19-21.
In the other quarter-final, unseeded Chinese Liu Xin beat Hong Kong's Yip Pui-yin 19-21, 21-13, 21-14.