Simona Halep advanced to the third round of the Madrid Open while Dominika Cibulkova was knocked out on Tuesday.
Third seed Halep battled past 2015 US open finalist Roberta Vinci 6-2, 2-6, 7-6(2) on the clay courts of the Spanish city.
It was Vinci who drew first blood, breaking Halep to go 3-2 up but the diminutive Romanian rallied to break back twice and take the opening set.
A tense second set saw Vinci nail a number of winner to earn a double break as she went on to force a deciding set.
The tension continued into the third, where the par swapped breaks on the way to a tiebreaker. Unfortunately, this is where the wheels came off for Vinci, as a series of unforced errors gave Halep a handful of match points.
Battles past Vinci 6-3, 2-6, 7-6(2)! pic.twitter.com/4DtpWModn7
— WTA (@WTA) May 9, 2017
Halep faces 2011 US Open winner Sam Stosur in the third round after the Australian defeated Mariana Duque-Marino 6-3, 7-5.
Later in the day, fourth seed Cibulkova was ousted by Oceane Dodin of France 6-2, 6-4. The Slovakian dropped no less than five service games during the clash as she was bundled out by the world number 63.
Elsewhere, in an all-Chinese clash, Qiang Wang edged compatriot Saisai Zheng 6-2, 3-6, 6-2.