Fifth seed Dominika Cibulkova played solidly to defeat Spain's Carla Carla Suárez Navarro during the first round of the Toray Pan Pacific Open at the Ariake Coliseum in Tokyo on Tuesday.
The 28-year-old Slovak needed 64 minutes to defeat Carla Suárez Navarro 6-3, 6-3 to set up a second-round meeting against Katerina Siniakova after the Czech beat another Slovak, Jana Cepelova 1-6, 6-3, 6-4.
In the opening set, Cibulkova got the early break and served out the first set claiming it 6-3 with her opponent not able to handle her powerful groundstrokes.
The Slovakian finished the next set in style, breaking once more, to secure her place in the second round.
In other results on Tuesday, Frenchwoman Caroline Garcia cruised past Aliaksandra Sasnovich of Belarus 6-4, 6-3 and Russia's Anastasia Pavlyuchenkova came from a set down to beat American Catherine Bellis 4-6, 6-0, 6-4.
Russian Daria Kasatkina beat American qualifier Madison Brengle 3-6, 6-2, 6-4 and will face Angelique Kerber of Germany in round two, while Monica Puig of Puerto Rica faces Spain's world number one Garbiñe Muguruza next up.
Shelby Rogers of the US beat Japan wildcard Risa Ozaki 6-2, 7-6 and will be up against Dane Caroline Wozniacki next, while Poland's Magda Linette got past Daria Gavrilova of Australia 2-6, 6-0, 7-6 to next take on Czech Karolina Pliskova.