In women's singles, double Olympic medallist PV Sindhu also dropped one place and is now ranked 16th.
Star Indian shuttlers PV Sindhu and Kidambi Srikanth will look to arrest their slump in form when they begin their campaign at the Australia Open badminton tournament in Sydney on Tuesday.
Sindhu now leads 3-0 against the Chinese on head-to-head.
Lakshya Sen progressed to the quarter-finals of the China Masters Super 750 badminton tournament with a straight-games win, but two-time Olympics medallist PV Sindhu's campaign ended in the second round in Shenzhen, China, on Thursday.
PV Sindhu turned 25 on Sunday as wishes poured in for her across the globe.
This is the second time in her career, after April 6 this year that Rio Olympics silver medallist Sindhu has occupied the second spot on the leaderboard.
Being hounded by eager selfie seekers is something that top level sportspersons are used to but Saina Nehwal's father and PV Sindhu's mother had a surprise 'fan' waiting for them outside the World Badminton Championship venue.
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
Young shuttlers PV Sindhu and Kidambi Srikanth scored contrasting victories to win the women's and men's singles titles respectively at the 78th Senior National Badminton Championships in Delhi on Monday.
Sindhu and her Korean coach Park Tae-sang were also felicitated by Singhania at the airport.
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
After a string of disappointing results, PV Sindhu parted ways with coach Park Tae Sang
India's PV Sindhu outclassed World No. 2 Akane Yamaguchi in straight games to storm into the final of the World Championships in Nanjing
Olympic medallists Manu Bhaker and Mirabai Chanu have joined Prime Minister Narendra Modi's initiative to combat obesity, emphasizing the importance of healthy lifestyle choices.
PV Sindhu stormed into the pre-quarterfinals of the Olympic Games' women's singles competition
Kidambi Srikanth made a winning start but PV Sindhu and HS Prannoy were ousted
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.
Sindhu, who had finished runner-up at the last edition in Dubai, dished out a superb game, mixing with patience with aggression, to edging the Japanese 24-22, 21-15.
Sindhu progressed to the quarterfinals with an easy straight-game win over Japan's Aya Ohori
Rankireddy and Shetty, who had arrived in Madrid after winning the Swiss Open Super 300 last week, retired from their first-round match
BAI cancels preparatory camp.
Kidambi Srikanth, Priyanshu Rajawat and Kiran George won their respective men's singles round-of 16 matches to advance to the quarterfinals late on Thursday night.
Rio Olympic silver medallist Sindhu, who made early exits at the China Open and Korea Open, dropped to the 6th spot after five months and the former World No 2 shuttler will look to make amends at the Denmark Open and French Open.
The win ensured Srikanth's dominance over his younger countrymate as he took his head-to-head record to 3-0 over Lakshya.
Former All England champion Prakash Padukone tipped PV Sindhu to be the world number one in the near future, but Saina Nehwal's coach Vimal Kumar was of the view that both the Olympic medallists could dominate world badminton in the next 5-7 years. While Saina became the first Indian shuttler to win an Olympic medal - a bronze - at 2012 London Olympics, Sindhu did one better by winning a historic silver at the Rio Games this year. "Definitely, Sindhu is capable of reaching the number one place," Padukone told reporters at the Olympic Gold Quest workshop for junior athletes in Bengaluru.
Satwiksairaj and Ashwini showed top-notch fighting spirit before going down
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.
India's PV Sindhu, drawn in easy group, faces Israel's Ksenia in opener.
P.V. Sindhu recognises how badminton has changed since she won the women's singles silver at the Rio Games eight years ago and says she needs to be smarter to win a third Olympic medal in Paris
IOA also announced that Sindhu, India's only woman athlete to win back-to-back Olympic medals, will be the flag bearer of the Indian contingent during the opening ceremony on July 26, alongside ace table tennis player Achanta Sharath Kamal.
Returning to action after a break, double Olympic medallist P V Sindhu saw off Turkey's Neslihan Yigit in straight games to join compatriots Kidambi Srikanth and Sameer Verma in the second round of the Denmark Open in Odense on Tuesday.
Indian shuttlers Lakshya Sen, Ayush Shetty, and Tharun Mannepalli progressed to the second round of the men's singles competition at the Macau Open Super 300 badminton tournament after registering fine wins on Wednesday.
India's first world badminton champion P V Sindhu said her next aim is to bag the gold medal at the Tokyo Olympics in 2020.
Mary Kom won the Padma Bhushan in 2013 and Padma Shri in 2006.
P V Sindhu is hoping to become India's first-ever woman Olympic gold medallist across all sporting disciplines when she takes on World champion Carolina Marin of Spain in the final of women's singles badminton event at the 2016 Olympic Games in Rio de Janeiro, on Friday.
Ace Indian shuttlers Saina Nehwal and HS Prannoy crashed out in the second round of the China Open Super Series after suffering straight game defeats in their respective events.
The third seeded Indian will face the winner of the other semi-final, between Japan's Aya Ohori and China's Wang Zhi Yi, on Sunday.
In mixed doubles, Tanisha Crasto and Dhruv Kapila advanced to the second round with a 8-21, 21-19, 21-17 victory over Chinese Taipei's Chen Cheng Kuan and Hsu Yin-Hui.
Rio Olympics and World Championship silver medallist P V Sindhu stood one step away from winning the Korea Open Super Series, in Seoul, on Saturday.
Sindhu yet again struggled to buck the trend of early exits
