Darja Vidmanova of the Czech Republic won 23 of her 31 first-service points en route to an upset of No. 7 seed Alycia Parks in the first round of the Guadalajara Open Akron on Monday in Mexico.

Parks had seven aces but hurt herself with 10 double faults. Vidmanova will face countrywoman Nikola Bartunkova in the next round of the WTA 500 event, as Bartunkova defeated Italy's Nicole Fossa Huergo 6-4, 6-2. Victoria Jimenez Kasintseva of Andorra was a 6-4, 6-3 winner over Elena Pridankina of Russia.

Three matches remained in the night session in Guadalajara, including Maria Sakkari of Greece against Elsa Jacquemot of France for the right to face top seed Elise Mertens of Belgium.

SP Open

Janice Tjen of Indonesia sailed past French seventh seed Leolia Jeanjean 6-2, 6-3 in first-round action

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