Johanna Konta got through a hard-fought first round at the WTA Abierto Mexicano Telcel on Monday as she overcame Anett Kontaveit 6-3 3-6 6-4.
The world number 26 lost a service game in the first set, but managed to break the unseeded Kontaveit twice in reply, before being broke twice herself in the second set.
The decider was equally well-fought, as both players continued to struggle on their serve.
Despite winning the final set 6-4, Konta was broken twice but managed to break Kontaveit three times on the way to victory and the next round.
Yanina Wickmayer survived a real scare against Mexican Victoria Rodriguez, as the eighth seed needed a tie-break in the third set to win through.
Wickmayer won 6-7 (5-7) 6-0 7-6 (7-2) as Rodriguez battled hard in front of her home crowd.
The unseeded Mexican was even serving for the match as she led 5-3 in the third, but failed to capitalise as Wickmayer cranked up the pressure and took the set to a tie-break before sealing the win.
Fifth seed Alison Van Uytvanck was not so lucky as she crashed out against Mariana Duque-Marino 4-6 6-4 6-4.
It was plain sailing for world number 59 Johanna Larsson, who cruised past qualifier Maria Sakkari 6-2 6-3, while third seed Anastasia Pavlyuchenkova advanced when Urszula Radwanska retired hurt with the Russian leading 6-0 2-3.
Japanese wildcard Naomi Osaka defeated Kiki Bertens 6-4 6-2 to progress to the second round.