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The organisers cited international travel restrictions as the main reason for the postponement.
Sindhu claimed India's first ever World Championships gold in 2019 but she made early exits from a series of tournaments, including the World Tour Finals last month.
Currently ranked ninth in the world, Saina has been struggling for form throughout this year. She suffered first-round losses six times this year.
Hendra Setiawan and Mohammad Ahsan showed that age is just a number as they never put their foot wrong and finished off a 15-13, 15-10 win in the decider.
Mumbai will hope to be third time lucky in the final on Sunday after losses to the Delhi Acers and the Chennai Smashers in the first two seasons.
Srikanth had accounted for the former World No. 1 Son Wan Ho twice on his way to winning four Super series titles in an incredible 2017 season.
After losing the first match, Bangalore came back strongly as Praneeth beat veteran Parupalli Kashyap 15-11, 15-12.
As for Delhi, this was their first victory in six matches in what has been a forgettable season.
Bengaluru needed a minimum of four points to move into the top 4 and they were successful in their attempt.
World No. 5 Son Wan Ho of Korea defeated England's Rajiv Ouseph in a crucial men's singles match.