The 19-year-old Bhaker, ranked No. 2, was pegged back by a technical glitch involving her gun after an impressive start saw her take one of the places in the top eight.
Manu's pistol had 'suffered a circuit malfunction'
Bhaker beat a two-time World Cup Finals winner and the host country's Alejandra Zavala, with a 10.8 in the last shot of the 24 shot final, to come out on top with a score of 237.5.
The teenager could be the youngest ever to win senior World Cup gold medals for India though the National Rifle Association of India (NRAI) could not confirm.
Deepak Kumar and Divyansh Singh Panwar finished a lowly 26th and 32nd respectively in the men's 10 metres Air Rifle event of the Tokyo Olympics on Sunday