Hantuchova's quarterfinal opponent will be Vania King, who advanced Wednesday with a 6-3, 6-3 win over Julie Coin.
Fourth-seeded Dominika Cibulkova had a more difficult time getting to the quarterfinals, but eventually ousted Sara Errani 3-6, 6-4, 6-1. Cibulkova will next meet No. 5 seed Agnes Szavay, who defeated Anna-Lena Groenefeld 6-1, 6-7 (4-7), 6-1.
Anastasija Sevastova earned her quarterfinal berth with a 6-1, 6-2 decision over Iveta Benesova.
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