Elena Rybakina of Kazakhstan hits a return during the women's singles quarterfinal match between Elena Rybakina of Kazakhstan and Victoria Mboko of Canada at the Pan Pacific Open tennis tournament in Tokyo on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Ekaterina Alexandrova reacts during the women's singles quarterfinal match between Sofia Kenin of the United States and Ekaterina Alexandrova of Russia at the Pan Pacific Open tennis tournament in Tokyo, Japan, on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Sofia Kenin serves during the women's singles quarterfinal match between Sofia Kenin of the United States and Ekaterina Alexandrova of Russia at the Pan Pacific Open tennis tournament in Tokyo, Japan, on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Victoria Mboko of Canada hits a return during the women's singles quarterfinal match between Elena Rybakina of Kazakhstan and Victoria Mboko of Canada at the Pan Pacific Open tennis tournament in Tokyo on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Elena Rybakina of Kazakhstan reacts during the women's singles quarterfinal match between Elena Rybakina of Kazakhstan and Victoria Mboko of Canada at the Pan Pacific Open tennis tournament in Tokyo on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Elena Rybakina of Kazakhstan serves during the women's singles quarterfinal match between Elena Rybakina of Kazakhstan and Victoria Mboko of Canada at the Pan Pacific Open tennis tournament in Tokyo on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Victoria Mboko of Canada hits a return during the women's singles quarterfinal match between Elena Rybakina of Kazakhstan and Victoria Mboko of Canada at the Pan Pacific Open tennis tournament in Tokyo on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Victoria Mboko of Canada serves during the women's singles quarterfinal match between Elena Rybakina of Kazakhstan and Victoria Mboko of Canada at the Pan Pacific Open tennis tournament in Tokyo on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Elena Rybakina of Kazakhstan hits a return during the women's singles quarterfinal match between Elena Rybakina of Kazakhstan and Victoria Mboko of Canada at the Pan Pacific Open tennis tournament in Tokyo on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Sofia Kenin hits a return during the women's singles quarterfinal match between Sofia Kenin of the United States and Ekaterina Alexandrova of Russia at the Pan Pacific Open tennis tournament in Tokyo, Japan, on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Ekaterina Alexandrova hits a return during the women's singles quarterfinal match between Sofia Kenin of the United States and Ekaterina Alexandrova of Russia at the Pan Pacific Open tennis tournament in Tokyo, Japan, on Oct. 24, 2025. (Xinhua/Jia Haocheng)

Ekaterina Alexandrova serves during the women's singles quarterfinal match between Sofia Kenin of the United States and Ekaterina Alexandrova of Russia at the Pan Pacific Open tennis tournament in Tokyo, Japan, on Oct. 24, 2025. (Xinhua/Jia Haocheng)