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.
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.
Devika Sihag, who won the Thailand Masters Super 300 title last week, acknowledged the role of PV Sindhu and coach Irwansyah Adi Pratama in her triumph
Olympic medallists Abhinav Bindra and PV Sindhu have praised Lakshya Sen for his performance at the All England Open badminton championship, highlighting his courage and resilience despite his runner-up finish.
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.
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.
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.
Lakshya Sen stunned world No 2 Jonatan Christie of Indonesia in straight games
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.
India's P V Sindhu squandered an 11-6 lead in the second game before going down 18-21, 21-18, 21-8 in 68 minutes to former world number one Akane Yamaguchi.
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.
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.
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.
Saina Nehwal breezed into the quarter-finals of the Denmark Open, scoring a 21-15, 21-17 victory over Japan's world No. 2-ramked Akane Yamaguchi on Thursday.
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.
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
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.
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.
Sindhu has been off colour this year, struggling for form.
Denmark's Viktor Axelsen and Japan's Akane Yamaguchi's dominance continued as they stayed on course for a second successive title.
Tai, who has played with both knees in braces in Paris, had previously opened up about an issue with her left knee.
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 24-year-old from Amalapuram expressed his gratitude to his partner for being there during this challenging time.
This is the first time that Sindhu has lost to a fellow Indian in an international event in seven years.
India's badminton ace P V Sindhu entered the summit clash of BWF World Tour Finals with a hard fought win over Akane Yamaguchi of Japan in the semi-finals, in Bali, on Saturday.
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.
World No. 3 Sindhu thrashed Yamaguchi 21-9, 21-13 in just 36 minutes to top Group A in women's singles at the Sheikh Hamdan Indoor Stadium. This was her last group stage match.
Sindhu battled hard before going down to Akane Yamaguchi 18-21, 15-21.
Sindhu, seeded third, was not at her usual best and trailed her Japanese opponent from the start in both the games.
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.
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.
Srikanth, Prannoy enter pre-quarters; Aakarshi knocked out
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.
The double bronze medallist at claimed a 21-8, 15-21, 21-16 over second seed Yamaguchi in a thrilling semi-final contest
Just like in her campaign opener against Japan's Akane Yamaguchi on Wednesday, Sindhu squandered a game advantage to lose yet again in the year-ending BWF World Tour Final
Srikanth made a good start in the second game, moving to 7-3 advantage but Lee once again turned the tables, jumping to 13-9 and kept his nose ahead to eventually shut the doors on the Indian.
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 will play her opening match on Sunday, while B Sai Praneeth and the men's pair of Chirag Shetty and Satwiksairaj Rankireddy will be in action on Saturday.
Kidambi Srikanth made a winning start but PV Sindhu and HS Prannoy were ousted