Loh Kean Yew defeated Lakshya Sen, who was the tournament's top seed and world no. 25, in 36 minutes to win his sixth international title.
The deadline for sending the entries had been extended twice, from September 10 to 15, and then to September 21.
It was India's second straight defeat after losing the Group A opener to Thailand, and the final match is against Finland on Wednesday.
Rankireddy/Shetty start Group A with a 21-16, 16-21, 27-25 victory over the World Number 3 seed Y. Lee/C.L. Wang.
Misha Zilberman defeated Sai Praneeth 21-17, 21-15 in the Group D match at the Musashino Forest Plaza Court 2.
The badminton events in the Olympics will begin on July 24 with the group stages, while the medal matches are to be held the week after.
The Badminton World Federation (BWF) announced the updated BWF Tournament Calendar for 2021. The changes are made to keep in mind the best time to host badminton tournaments over t...
Sindhu didn't have great results in the run-up to the Olympics with just one final to show at the Swiss Open.
Sindhu will carry a billion hopes as she remains one of the favourites to claim a medal at the delayed Tokyo Games, beginning July 23.
Nehwal and Srikanth finished outside the top 16 of the singles rankings in the Race to Tokyo standings, thereby missing out on Olympic berths.