Top-seeded Agnieszka Radwanska of Poland began her title defence in comfortable fashion by beating Polona Hercog of Slovenia 6-3 6-3 in the Korea Open.
Playing her second title of the year, Radwanska set up a second-round match against Chanelle Scheepers of South Africa.
Also on Tuesday, second-seeded Karolina Pliskova of the Czech Republic, who lost the Hong Kong final last weekend, coasted past Julia Glushko of Israel 6-1 6-2, and third-seeded Klara Koukalova, also of the Czech Republic, overcame Kiki Bertens of the Netherlands 6-0 4-6 6-4 for the second time in five weeks.
No.4 seed Magdalena Rybarikova of Slovakia and No.6 Kaia Kanepi of Estonia were also winners, alongside 2008 champion Maria Kirilenko of Russia, who received a wild card in her comeback from a knee injury.
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