She clinched both the women's and junior women's 10m air pistol title at the 20th Kumar Surendra Singh Memorial Shooting event.
In the previous edition of the tournament, the Indian shooting contingent won 16 medals.
Bhaker is the youngest Indian to win a gold medal at the ISSF World Cup.
Earlier, during the New Delhi World Cup in March this year, Jaspal Rana had paraded the Karani Singh shooting ranges with Manu's alleged personal message to him imprinted on the back of his white T-shirt.
While PV Sindhu will now face Japan's 4th seed Akane Yamaguchi in the last 8, Manu Bhaker will play the Rapid Round on Friday.
While many people are thinking that it's the end of road for the young shooter in the Games, it's not actually true as the 19-year-old can still turn the tables in Tokyo.
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