Cincinnati - Simona Halep fought back from a set down to defeat Russia's Ekaterina Alexandrova 3-6, 7-5, 6-4 in her Cincinnati WTA opener on Wednesday.
Wimbledon champion Halep, seeded four, earned a late break in the penultimate game of the final set to reach the third round after two hours of action.
Halep has finished runner-up in Cincinnati three times, last reaching the final a year ago against Kiki Bertens.
In the next round, the 27-year-old Romanian, who retired injured from her Toronto quarter-final against Czech qualifier Marie Bouzkova last week, will next face either Madison Keys of the United States or Russia's Daria Kasatkina.
Results on Wednesday in the WTA/ATP Cincinnati Masters (x-denotes seeding):
Richard Gasquet (FRA) bt Federico Delbonis (ARG) 7-5, 7-6 (7/1)
Yoshihito Nishioka (JPN) bt Kei Nishikori (JPN x6) 7-6 (7/2), 6-4
Alex De Minaur (AUS) bt Reilly Opelka (USA) 7-6 (7/3), 6-4
Aryna Sabalenka (BLR x9) bt Zheng Saisai (CHN) 6-4, 6-3
Elina Svitolina (UKR x7) bt Elise Mertens (BEL) 6-4, 6-1