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Lakshya, seeded eighth, needed 59 minutes to overcome Weng 17-21 21-18 21-16 in the summit clash for his third successive singles title of the season.
World No. 5 Son Wan Ho of Korea defeated England's Rajiv Ouseph in a crucial men's singles match.
The Aces' fate depends on the outcome of the Warriors and the Raptors matches.
As for Delhi, this was their first victory in six matches in what has been a forgettable season.
With Sai Praneeth's exit, Indian challenge has ended in the men's singles event.
Satwiksairaj Rankireddy and Chirag Shetty stunned third seeds Li Jun Hui and Liu Yu Chen of China 21-19, 18-21, 21-18 in the summit clash to become the first Indian pair to win a BWF Super 500 event.
Indian shuttler H S Prannoy stunned London Olympics gold medallist and multiple-time world champion Lin Dan in a hard-fought match to enter the pre-quarterfinals of the World Championships here on Tuesday.
Prakash Padukone was the first Indian to win a men's singles World Championships medal - a bronze - in the 1983 edition.
India also got a favourable result in the women's doubles with Meghana Jakkampudi and S Poorvisha Ram getting past the Guatemala pairing of Diana Corleto Soto and Nikte Alejandra Sotomayor to enter the second round.
The other Indians in fray, seventh seed Kidambi Srikanth and 10th seed Sameer Verma, play their first round on Monday.
Results 591-600 of 609