Two-time world champion Kento Momota suffered a shock first-round defeat in the Asia Championships on Wednesday as his poor run of form hit a new low.
Indonesia's Chico Aura Dwi Wardoyo, ranked 52nd in the world, lost the first game but stormed back to stun the Japanese top seed 17-21, 21-17, 21-7 in just over an hour in Manila.
In the women's singles, top seed and Momota's fellow Japanese Akane Yamaguchi had no such trouble with a 21-15, 21-9 demolition of India's Aakarshi Kashyap in just 26 minutes.
The 27-year-old Momota, the former world number one now ranked second behind Denmark's Viktor Axelsen, has never recovered his scintillating top form after being badly injured in a career-threatening car crash in January 2020.
Momota's only title since the crash came at the Indonesia Masters last November and soon after he pulled out of December's World Championships with a back injury.
Momota lost his opening match at the German Open last month and failed to get past the quarter-finals at the prestigious All England Championships.
The Japanese ace said that his "spirit was almost broken" by the accident which killed his driver on the way to Kuala Lumpur airport just hours after winning the Malaysia Masters.
Momota suffered double vision and needed surgery on an orbital bone near his eye, leaving him fearing his career might be over.
He returned to the circuit at the end of 2020 and had been favourite for Olympic gold on home soil in Tokyo last year, but was eliminated early.
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