Top seed Caroline Wozniacki eased into the second round of the KDB Korea Open as she saw off Arantxa Rus in straight sets in Seoul.
World number 11 Wozniacki needed a little over an hour to beat Rus 6-1 6-2.
Wozniacki will now face French qualifier Caroline Garcia in the second round after the 18-year-old beat Alexandra Cadantu 6-2 6-3 to progress.
Estonian third seed Kaia Kanepi secured a comfortable path into the second round as she inflicted a comfortable win over wildcard Han Sung-hee, losing only one game to the South Korean. It was Kanepi's first match since the French Open in June following an Achilles injury.
Last year's beaten finalist Galina Voskoboeva will be waiting for Kanepi in the next round after also easing past a wildcard, with the Kazakhstani beating Hyun Hui Hong 6-1 6-2.
Julia Goerges was the only seeded player to fall at the first-round stage on Tuesday as she was sent packing by Spain's Silvia Soler-Espinosa after three sets.
Goerges took the first set 6-1 with a commanding display before losing the next two 7-6 (7/5), 6-2.
Soler-Espinosa's reward for her hard-fought comeback is a second-round tie with Kiki Bertens, who beat Vania King in straight sets.
Varvara Lepchencko, Klara Zakopalova and Ekaterina Makarova, the other seeded players in action, all progressed with only Zakopalova dropping a set.
There were also wins for Magdelana Rybarikova, qualifier Jamie Hampton and Anabel Medina Garrigues.
