Stosur, who won the U.S. Open in 2011, was looking to win her first WTA title since Strasbourg in 2017. At the Toray Pan Pacific tournament, top-seeded and last year's U.S. Open champion Naomi Osaka beat Elise Mertens 6-4, 6-1 to reach the final. She will play Anastasia Pavlyuchenkova, who defeated Angelique Kerber 6-3, 6-3.
At the Korea Open in Seoul, Yafan Wang beat Karolina Muchova 7-6 (5), 6-4 and will face fourth-seeded Magda Linette of Poland in the final. Linette beat second-seeded Ekaterina Alexandrova 7-6 (5), 7-6 (7).
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