Johanna Konta has been beaten in her first tournament since reaching the semi-finals of the Australian Open.
The British number one, 24, lost 4-6 6-2 7-5 to Croatia's Mirjana Lucic-Baroni, 33, in round two of the Abierto Mexicano Telcel in Acapulco.
Fourth seed Konta had two break points in the 11th game of the final set but failed to take them.
Fellow Brit Aljaz Bedene is also out of the men's event after he lost 4-6 7-6 (7-3) 4-6 to Dutchman Robin Haase.