Claire Liu, United States, def. Katerina Siniakova, Czechia, walkover.

Jil Teichmann, Switzerland, def. Zeynep Sonmez (6), Turkey, 4-6, 6-3, 6-1.

Xinran Sun, China, def. Maria Timofeeva (7), Russia, 6-3, 4-6, 7-6 (3).

Kaitlin Quevedo, Spain, def. Anna Bondar, Hungary, 7-5, 6-3.

Lilli Tagger (4), Austria, def. Magda Linette, Poland, 6-2, 6-2.

I-Hsuan Cho and Yi Tsen Cho, Taiwan, def. Fanny Stollar, Hungary, and Fang-Hsien Wu (3), Taiwan, 3-6, 7-6 (2), 10-6.

Maria Timofeeva and Polina Kudermetova, Russia, def. Andreja Klepac, Slovenia, and Eri Hozumi (4), Japan, 7-6 (4), 6-1.