Romania's Ana Bogdan advanced the quarterfinals of the Japan Open with a 6-0, 7-6 (5) victory over No. 4 seed Marie Bouzkova of the Czech Republic on Thursday in Osaka.

Bogdan overcame a 3-1 deficit in the tiebreak to finish in just under 2 hours, setting up a match with unseeded Suzan Lamens of the Netherlands.

It was a day of upsets, as Japan's Sara Saito defeated No. 5 Elina Avensyan of Armenia 7-6 (2), 6-4 and Australia's Kimberly Birrell was leading 3-6, 7-5, 4-1 when No. 3 Elise Mertens of Belgium retired. Seventh-seeded Diane Parry avoided the upset bug with a 6-4, 6-2 defeat of Belgium's Greet Minnen.

Ningbo Open

Fourth-seeded Barbora Krejcikova of the Czech Republic moved into the quarterfinals in China with a 7-6 (5), 6-3 victory against home hopeful Ye-Xin Ma.

Ma had her chances, leading 6-5 in the opening set and 5-3 in the tiebreak. Krejcikova will meet Russia's Mirra Andreeva in the final eight.

No. 6 Beatriz Haddad Maia held off England's Katie Boulter 7-6 (2), 7-5 and No. 7 Anna Kalinskaya of Russia beat China's Yue Yuan 6-3, 6-3. Karolina Muchova of the Czech Republic needed only 77 minutes to complete a 6-2, 6-1 victory over Romania's Jaqueline Cristian.

--Field Level Media