Korea Open: Liu upsets seventh seed Rus to move into last eight

American Claire Liu moved into the last eight of the Hana Bank Korea Open when Dutchwoman Arantxa Rus, the No 7 seed, retired during their second round match on Wednesday.

Liu, ranked No 98 in the world, led 1-6, 6-3, 3-0 when Rus, ranked No 51, pulled out of the match in Seoul. This will be Liu’s first WTA level quarter-final on hard courts in more than a year.

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The American will play the winner of the match between top seed Jessica Pegula and Ashlyn Krueger next.

Claire Liu defeated qualifier Yeonwoo Ku (6-3, 6-3) in her first round match while the Dutchwoman won against wildcard Na-Lae Han (6-1, 6-3).

Korea Open WTA 250, other second-round matches (Hard, USD 259.303):

• Kimberly Birrell vs. Dayeon Back
• Su Jeong Jang vs. Emina Bektas
• Eva Lys vs. Marie Bouzkova
• Jessica Pegula vs. Ashlyn Krueger
• Kaja Juvan vs. Yue Yuan
• Ekaterina Alexandrova vs. Yanina Wickmayer
• Kathinka von Deichmann vs. Polina Kudermetova