Kimberly Birrell has cruised into the quarter-finals of the WTA's Korea Open, thrashing local wildcard Dayeon Back in straight sets.
The 25-year-old Australian recorded a 68-minute 6-0 6-1 demolition to set up a last-eight clash with American Emina Bektas, who earlier on Thursday scored a 6-3 6-4 win over another South Korean in Su Jeong Jang.
After winning her opening-round match in straight sets by defeating American Sachia Vickery, Birrell took little time in claiming the opening eight games of her second-round contest in Seoul.
The current world No.102, who has a career-best ranking of 100, broke again in the fifth and seventh games of the second set to wrap up one of her most convincing victories on tour.
The win matches Birrell's career-best singles result at WTA level, having made her first quarter-final appearance at Merida, Mexico in February.
Back, a 21-year-old ranked No.569, had stunned the tournament's second seed, world No.13 Jelena Ostapenko, in the opening round.
Elsewhere, fourth seed Marie Bouzkova was leading 6-0 1-0 when her German opponent Eva Lys retired with injury. The Czech will now face China's Yue Yuan in the quarters.
In the day's final singles clash, before Birrell teamed up with Bektas in a losing doubles quarter-final match, top seed and world No.4 Jessica Pegula saw off teenager Ashlyn Krueger 6-3 6-1.
Pegula will take on another American in Claire Liu in the last eight.