Third seed Daria Gavrilova has fought back to defeat American Madison Brengle 4-6 6-3 6-3 in the opening round of the Mexico Open.
The Australian struggled on her serve, double-faulting four times in the first set and 11 times throughout Monday's match.
But Gavrilova found her rhythm in the second set, winning 6-3 after claiming an early break.
The 23-year-old struggled with her serve again in the third but 76th seed Brengle was unable to take break points and Gavrilova went on to claim the final set 6-3.
The Australian will meet either Kristyna Pliskova or wildcard Renata Zarazua in the second round.
Elsewhere in Acapulco, fifth seed Irina-Camelia Begu came back from a set down against Christina McHale, winning 3-6 6-2 6-4, to set up a second-round match against Veronica Cepede Royg, who beat Belinda Bencic 4-6 7-6 (7/1) 6-3.
Defending champion Lesia Tsurenko eased to a 6-4 6-1 victory against Lauren Davis, while Kateryna Kozlova retired while behind 6-2 1-0 against Arina Rodionova.
Ukraine's Dayana Yastremska also retired at 2-6 6-4 5-0 against Monica Puig.
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