British number two Aljaz Bedene reached the second round of the Abierto Mexicano Telcel in Acapulco with a 6-4 1-2 victory over Ivo Karlovic.
The world number 54 progressed after big-serving Croatian Karlovic was forced to retire in the second set.
Bedene, 26, has exited in the first round of the last three tournaments in Brazil, Australia and New Zealand
He will face Dutchman Robin Haase - ranked world number 62 - in the next round on Wednesday at 23:00 GMT.