P V Sindhu took the opening game 21-11 before Akane Yamaguchi, who was wearing a knee brace, decided to pull out of the match.
Paris Olympics gold medallist An Se-young beat Japan's Akane Yamaguchi 21-15, 21-12 in the last four of badminton's World Tour Final in Hangzhou on Saturday to set up a title clash with defending champion Wang Zhiyi.
Sen, who had broken the three-year jinx of first-round exits in the tournament when he defeated Singapore's Jia Heng Jason Teh on Wednesday, succumbed in the pre-quarterfinals against Hong Kong-China's Lee Cheuk Yiu 22-22, 15-21 in 53 minutes.
Rising Indian shuttler Anmol Kharb's impressive run at the Arctic Open Super 500 badminton tournament ended with a straight-game loss to three-time world champion Akane Yamaguchi in Vantaa, Finland, on Saturday.
This was their third semifinal appearance on the BWF Tour this season, having earlier reached the last four at the Singapore Open and India Open.
Satwiksairaj Rankireddy and Chirag Shetty outclassed Ong Yew Sin and Teo Ee Yi of Malaysia in straight games to enter the semi-finals of the China Open Super 100.
This is the first time that Sindhu has lost to a fellow Indian in an international event in seven years.
Sindhu has been off colour this year, struggling for form.
Indian mixed doubles pair of Dhruv Kapila and Tanisha Crasto suffered a straight game loss to Hong Kong's fifth-seeded duo of Tang Chun Man and Tse Ying Suet in the quarterfinals of the Badminton Asia Championships in Ningbo, China, on Friday.
Double Olympic medalist PV Sindhu and promising shuttler Priyanshu Rajawat bowed out of the Badminton Asia Championships in the pre-quarterfinals, while mixed doubles pair of Dhruv Kapila and Tanisha Crasto advanced to the last eight
Shi Yuqi will face Lee Chia-hao in the men's singles final at the All England Open Badminton Championships, while Wang Zhiyi will compete against An Se-young in the women's final, after they won their semi-finals on Saturday.
Lakshya Sen stunned world No 2 Jonatan Christie of Indonesia in straight games
Double Olympic medallist P V Sindhu made a winning start to the Badminton Asia Championships with a straight-game win over Ester Nurumi Wardoyo of Indonesia in the women's singles while Lakshya Sen made an early exit from the men's singles draw in Ningbo, China, on Wednesday.
The other semi-final will feature France's Alex Lanier, who beat Taiwan's Wang Tzu-wei 21-19, 21-13, and Lee Chia-hao of Taiwan who defeated Japan's Kenta Nishimoto 21-9, 21-18.
Top seed and 2018 winner Shi Yu Qi of China dispatched Indonesia's Chico Aura Dwi Wardoyo 21-13, 21-8 while compatriot Li Shi Feng, world number six, came from behind to beat Canadian Brian Yang 21-11, 18-21, 21-16.
The 24-year-old from Amalapuram expressed his gratitude to his partner for being there during this challenging time.
The Nagpur shuttler was no match for Yamaguchi in the opening game as the Japanese took a massive eight-point lead at 12-4 before closing out the game at 21-10.
Malvika Bansod continued her fine form as she cruised to her maiden Super 1000 quarterfinal after eking out a hard-fought victory against higher-ranked Kristy Gilmour in the China Open in Changzhou on Thursday.
Tai, who has played with both knees in braces in Paris, had previously opened up about an issue with her left knee.
Malvika Bansod pulled off a sensational straight-game victory over Paris Olympics bronze medallist Gregoria Mariska Tanjong of Indonesia in the women's singles opening round.
Sindhu stands on the brink of history as she pursues the gold medal in the upcoming Games, having won a silver and bronze in 2016 Rio and 2020 Tokyo edition respectively.
Indian women shuttlers' progressed to their first-ever final at the Badminton Asia Team Championships after edging out two-time former champions Japan 3-2.
Chief national badminton coach Pullela Gopichand on Monday singled out world number one doubles pair of Satwiksairaj Rankireddy and Chirag Shetty as favourites for an Olympic medal and said two-time medallist PV Sindhu too is on the right path and can deliver once again at the Paris Games.
World champion Kunlavut Vitidsarn crashed out of the India Open Super 750 badminton tournament
Srikanth, Prannoy enter pre-quarters; Aakarshi knocked out
Set to return after an injury-induced break, two-time Olympic medallist PV Sindhu is aware the road to Paris will be "challenging" and she needs to be "smarter" in her pursuit of coveted gold medal in the French capital.
As Kidambi Srikanth lost his second round match, India's campaign ended at the Singapore Open.
World No. 1 Yamaguchi, however, had to toil hard to get across three-time world champion and Rio gold medallist Carolina Marin of Spain 21-17, 14-21, 21-19 in the day's first match at the IG stadium in New Delhi.
Lakshya Sen upset World No 4 Loh Kean Yew of Singapore in the round of 32 match at the Malaysia Masters.
Lakshya Sen, returning from a break, suffered a first round exit, while Treesa Jolly and Gayatri Gopichand entered the pre-quarters of the Asia Badminton Championship.
The core of the team remains the same with HS Prannoy, Lakshya Sen and Satwiksairaj Rankireddy and Chirag Shetty in good form and the Indian team would hope the rub of the green also goes their way when it begins campaign on Thursday.
Kidambi Srikanth made a winning start but PV Sindhu and HS Prannoy were ousted
Sindhu, Sen look to regain lost touch in Canada Open
Sen has a 4-2 head-to-head record against his final opponent Li Shi Feng, the reigning All-England champion. Sen had defeated him recently at the Thailand Open.
Thailand's Kunlavut Vitidsarn and Korea's An Seyoung emerged men's and women's singles champions respectively at the India Open Super 750 tournament.
With the main draw of the Asian Badminton Championships set to get underway from Wednesday, the struggling Indian shuttlers face an uphill task.
Fresh from their Korea Open triumph, Satwiksairaj Rankireddy and Chirag Shetty will look to continue their dream run.
India's two-time Olympic medallist P V Sindhu romped into the women's singles semi-finals of the Indonesia Masters Super 750 badminton tournament with an easy victory over Turkey's Neslihan Yigit, in Bali, on Friday.
Sindhu, seeded third, was not at her usual best and trailed her Japanese opponent from the start in both the games.
Sindhu assured herself of a medal in the Double Olympic medallist P V Sindhu eked out a thrilling win over China's He Bing Jiao to enter the singles semi-finals of the Badminton Asia Championships in Manila on Friday.