Indian qualifier Sania Mirza [ Images ] edged past Vania King [ Images ] in a three-set battle to book a pre-quarterfinal berth in the WTA Family Circle Cup in Charleston, USA.

Showing nerves of steel, Sania erased a one-set deficit to score a 6-7(6), 6-4, 6-2 win over in-form local player in the second round of the $721,000 hard court event.

King had ousted 16th seed Russian Vera Dushevina in her opening round.

Sania will fight it out with either fourth seed Marion Bartoli [ Images ] of France [ Images ] or German wild card Sabine Lisicki for a spot in the last-eight.

Lisicki and world number 10 Bartoli will clash in their second round on Wednesday.