The scoreline read 5-5 after two rounds. But the 23-year-old Indian was declared the winner having superior Class points 3-1 at the Carioca Arena 2 - MAT B.
The Rohtak-born grappler was trailing 0-3 initially, but upped her game to mount a successful comeback, clawing to 1-3 and then securing four successive points to lead 5-3.
Sakshi was unable to hold on to the lead as Mariana squared the contest on points.
But securing four consecutive points tilted the balance in her favour.
Sakshi defeated Sweden's Malin Johanna Mattson 5-4 in the qualification match earlier.
She will play against Russia's Valeriia Koblova in the 1/4 round match.
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