Ritu, who won an Asian Championship bronze last year, began with a close 5-4 win against Ukraine's Ilona Prokopevniuk but lost the quarterfinal 2-6 to Finland's Petra Maarit Olli.
The Commonwealth Games and Asian Games gold medallist Bajrang eventually had to settle for a silver, which is his second medal at the Worlds.
The Olympic bronze medallist has been battling poor form since the start of the 2018 season, failing to claim a medal in the 2018 Asian Games.
Sindhu, who had finished runners-up at the Glasgow edition last year, notched up a superb 21-16 24-22 win over world number two Yamaguchi.
Saina showed amazing retrieving skills against Inthanon, who is on a comeback trail after recovering from an injury.
With two bronze medals in 2013 and 2014 and a silver last year, Sindhu has an impressive record at the World Championship.
PV Sindhu will be leaving with the Indian team on Saturday for the World Championship in Nanjing, China beginning on July 30.
Lewis Hamilton has won the F1 title in three of the past four seasons with Mercedes, losing out to former teammate Nico Rosberg last year.
Vettel will be seen in action in the next Formula One race of 2017, which will take place on November 12.
Former world number one Saina knocked Olympic champion Carolina Marin out of Denmark Open on Wednesday in the first round to avenge her Japan Open second-round loss to the Spaniard.
Two-time bronze medallist P V Sindhu will open her campaign against either Korea's Kim Hyo Min or Egypt's Hadia Hosny in the second round and is likely to meet China's Sun Yu for a place in the quarterfinals.
For a country which has taken part in every championships since the first one in 1983, legendary long jumper Anju Bobby George's bronze in Paris 2003 has been the lone medal at this global stage.
In the quarterfinal on Thursday, Joshna and Dipika are scheduled to take on the Group A runner up Samantha Cornett and Nikole Todd of Canada.
Dutee's best of 11.30 seconds, which she clocked during the Indian Grand Prix in New Delhi on May 15, during the qualifying period gives her a global ranking of 100.
Manpreet Kaur has been suspended as she was tested 'Positive' twice and found banned substances in her urine sample.
The absence of top stars took some sheen away but India's record-breaking medal haul and a maiden top-of-the-table finish made the just-concluded 22nd Asian Athletics Championship here a memorable one
India creates history as they top the table at the Asian Athletic Championship while booking their place in the World Championship in November, London.
The Olympic silver medallist has previously won bronze medals at the World Championship in 2013 and 2014.
After winning the Indonesia Open Super Series and the Australian Open Super Series titles - Indian shuttler K Srikanth is all set to regain his place in the World top 10.
Giving new hopes to the fans of the sport in the country, World Junior bronze-medallist Sachin Singh (49kg) today became only the third Indian boxer ever to land a gold at the AIBA Youth World
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