Indian qualifier Sania Mirza edged past Vania King 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.
Sania will fight it out with either fourth seed Marion Bartoli of France 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.
Sania Mirza qualifies for Family Circle Cup
Wozniacki, Bartoli reach Indian Wells final
Top seed Wozniacki clinches Indian Wells title
Ailing Bartoli and Wickmayer reach last four
Sania in main draw of Miami WTA