The 20-year-old, ranked 101st in the world, is expected to soar nearly 50 places in the ATP standings after humbling fifth seed Ramos-Vinolas.
Playing in his third ATP final, Ramos-Vinolas converted his only break point early in the match and looked poised to clinch the first set easily but Khachanov forced a tiebreak before surrendering it 7-4.
However, Khachanov levelled the match against the Spaniard when he bagged a tightly-contested second set 7-3 in the tiebreak.
Khachanov, who had beaten three seeded players en-route to his first ATP final, relied on his strong service game to complete a memorable win.
(Reporting by Nivedita Shankar in Bengaluru, editing by)
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