Tanvi will take on top seed Beiwen Zhang of the United States in the final.
Ayush Shetty notched up his first BWF World Tour title with a commanding straight-games victory over Canada's Brian Yang in the men's singles final of the US Open Super 300.
Sindhu's disappointing performances have seen her to slip to 17th in the BWF world rankings, her worst slump in a decade. Her previous highest ranking was 2nd in 2016.
Sindhu saw off Sim 21-13, 12-21, 21-14 in a 59-minute women's singles second-round match to register her third win over the Korean world number 34.
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.
Newly-crowned Canada Open champion Lakshya Sen will hope to continue his winning momentum while beginning his campaign at the US Open Super 300 badminton tournament.
PV Sindhu produced another impressive show as she rallied to a three-game win over USA's Beiwen Zhang to advance to the women's singles quarterfinals
India's ace shuttler PV Sindhu breezed into the second round of the French Open after crushing Beiwen Zhang in straight games.
P V Sindhu has made early exits in as many as seven of the 12 BWF World Tour events this year.
Parupalli Kashyap advanced to the men's singles quarter-finals at the Korea Open after a hard-earned victory over Malaysia's Daren Liew, in Incheon, on Thursday. The Indian shuttler prevailed 21-17, 11-21, 21-12 in 56 minutes.
None of the other three quarters boast of such a strong star cast but there would be a few mouth-watering opening round clashes to look forward to.
Srikanth made an attacking start after the change of ends, putting his smashes to good use, to lead 5-1. Two tight smashes on either side helped the Indian to maintain his lead to 8-3 before he entered the break with a healthy seven-point advantage when Axelsen went to the net.
Saina Nehwal and P V Sindhu are on a collision course at next week's World Championships in Basel, Switzerland, as they have been placed in the same half after the world governing body re-conducted the women's singles draw.
Defending champion P V Sindhu stood just one step away from retaining her title after defeating Thailand's Ratchanok Inthanon in a lop-sided semi-final at the $ 350,000 India Open Super 500 tournament in New Delhi on Saturday.
P V Sindhu advanced into the women's singles final
Olympic silver medallist P V Sindhu continued her unbeaten run while debutant Sameer Verma also qualified for the knockout stage with a straight-game win in his last Group B match at the BWF World Tour Finals.
Sixth seed Tanvi Lad finished runners-up at the Swiss International Challenge badminton tournament after suffering a straight-game defeat against USA's Beiwen Zhang in the women's singles competition at Yverdon-Ies-Bains, Switzerland.
Commonwealth Games champion Parupalli Kashyap, Sameer Verma and the mixed doubles pair of Satwiksairaj Rankireddy and Ashwini Ponnappa notched thrilling victories to enter the quarter-finals of the India Open Super 500 World Tour badminton tournament in Delhi on Thursday.
Third seed Sindhu lost 17-21, 21-16, 18-21 to Zhang in another tough opening encounter that lasted 56 minutes.
Making a comeback after a three-month injury lay-off, Saina Nehwal struggled to make an impression as she went down to Thailand's Porntip Buranaprasertsuk in the first round of the China Open Super Series.
Sindhu, Saina advance to 2nd round; Reddy-Ponnappa out
Sindhu lost 7-21, 24-22, 15-21 to Beiwen Zhang of United States in a match that lasted 56 minutes while World Championships bronze-medallst Sai Praneeth was trailing 9-21, 7-11 when he conceded the match to fifth-seeded Anders Antonsen of Denmark due to an unspecified injury.
Sindhu, who had finished runners-up at the last edition in Dubai, will have a tough task at hand as she has been clubbed with defending champion Akane Yamaguchi of Japan, World No 1 Tai Tzu Ying of Chinese Taipei and USAs' Beiwen Zhang in Group A.
Olympic bronze medallist Saina Nehwal started her campaign on a positive note, advancing to the second round of the women's singles competition but it was curtains for Parupalli Kashyap and K Srikanth in the men's singles category of the All England championship in London.
Olympic medallist PV Sindhu yet again finished second-best in a major final but grabbed a historic individual silver medal at the Asian Games after losing the women's singles title clash to world number one Tai Tzu-Ying in Jakarta on Tuesday.
Saina Nehwal was made to sweat by American Beiwen Zhang before making it to the women's singles quarter-finals in the All-England Badminton Championships in Birmingham on Thursday night. The seventh seeded Indian ace needed an hour to quell the challenge of the American qualifier 24-22, 18-21, 21-19 in a second round match.
Olympic bronze medallist Saina Nehwal emerged the lone survivor at the US $400,000 All England Championship, thrashing Scotland's Kirsty Gilmour in straight-games to reach the second round even as compatriot PV Sindhu fell by the wayside in Birmingham.
World champion Chen Long avoided a potential first-round exit at the All-England Championships on Wednesday and blamed an uncomfortable pillow for a sluggish start to his campaign.
Olympic silver-medallist P V Sindhu and Ajay Jayaram advanced to the quarter-finals after registering thrilling three-game wins over their respective opponents in the second round of the China Super Series Premier, in Fuzhou, on Thursday.
Two-time silver medallist P V Sindhu produced yet another commanding performance as she demolished Beiwen Zhang of United States in straight games to advance to the quarter-finals of the BWF Badminton World Championships.
A summary of sports events and sports persons, who made news on Thursday
Sindhu seeks improvement on fitness, defence in se
P V Sindhu hoped to regain peak fitness before the start of individual events and assured India will return with multiple medals.
A summary of sports events and sports persons, who made news on Tuesday
World champion Viktor Axelsen staved off a strong challenge from World No 5 Korean Son Wan Ho as Bengaluru Blasters blanked Mumbai Rockets 6-(-1) in the Premier Badminton League (PBL) in Lucknow on Monday.
Ace Indian shuttler P V Sindhu suffered a three-game defeat to much lower-ranked Nozomi Okuhara of Japan in the second round of $350,000 Hong Kong Super Series, in Kowloon, on Thursday. However, Saina Nehwal and Kidambi Srikanth scored contrasting victories to enter the quarter-finals of the women's and men's singles respectively.
A summary of sports events and sports persons, who made news on Thursday
A summary of sports events and persons who made news on Wednesday.