Casey Dellacqua has failed to capitalise on her quarter-final opponent's dismal serving to be eliminated from the WTA Tour's Pan Pacific Open in Tokyo.
The Australian lost to Spain's Garbine Muguruza, who served 10 double-faults in a 3-6 7-6 (7-5) 6-3 defeat on Friday.
Muguruza will face US Open finalist Caroline Wozniacki in the semi-finals after the second-seeded Dane beat eighth-seeded Carla Suarez Navarro of Spain 6-3 6-3.
Wozniacki was in control from the start, breaking her opponent three times in the opening set at Ariake Coliseum.
"It was a little like playing chess," said Wozniacki, who won the tournament in 2010. "We opened up the court and tried to outplay each other."
Top-seeded Angelique Kerber of Germany also advanced, beating sixth-seeded Dominika Cibulkova 6-3 6-0.
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