Iva Jovic (4), United States, def. Jasmine Paolini, Italy, 6-4, 6-3.

Katarzyna Kawa, Poland, def. Belinda Bencic (5), Switzerland, 7-5, 6-2.

Diana Shnaider (6), Russia, def. Alexandra Eala, Philippines, 7-5, 6-4.

Kristina Mladenovic, France, and Hanyu Guo (3), China, def. Demi Schuurs, Netherlands, and Ellen Perez, Australia, 2-6, 7-5, 10-4.

Nicole Melichar-Martinez, United States, and Cristina Bucsa (1), Spain, def. Marta Kostyuk, Ukraine, and Leylah Fernandez, Canada, walkover.

Desirae Krawczyk, United States, and Fanny Stollar, Hungary, def. Maia Lumsden, Britain, and Maria Kozyreva, Russia, 3-6, 7-6 (5), 10-4.