Isabella Shinikova of Bulgaria returns a shot against Karolina Pliskova of the Czech Republic during a singles match in the Pan Pacific Open tennis tournament in Tokyo, Tuesday, Sept. 20, 2022. (AP Photo/Hiro Komae)

Karolina Pliskova of the Czech Republic serves against Isabella Shinikova of Bulgaria during a singles match in the Pan Pacific Open tennis tournament in Tokyo, Tuesday, Sept. 20, 2022. (AP Photo/Hiro Komae)

Karolina Pliskova of the Czech Republic returns a shot against Isabella Shinikova of Bulgaria during a singles match in the Pan Pacific Open tennis tournament in Tokyo, Tuesday, Sept. 20, 2022. (AP Photo/Hiro Komae)

Isabella Shinikova of Bulgaria returns a shot against Karolina Pliskova of the Czech Republic during a singles match in the Pan Pacific Open tennis tournament in Tokyo, Tuesday, Sept. 20, 2022. (AP Photo/Hiro Komae)

Isabella Shinikova of Bulgaria returns a shot against Karolina Pliskova of the Czech Republic during a singles match in the Pan Pacific Open tennis tournament in Tokyo, Tuesday, Sept. 20, 2022. (AP Photo/Hiro Komae)

Karolina Pliskova of the Czech Republic returns a shot against Isabella Shinikova of Bulgaria during a singles match in the Pan Pacific Open tennis tournament in Tokyo, Tuesday, Sept. 20, 2022. (AP Photo/Hiro Komae)

Karolina Pliskova of the Czech Republic serves against Isabella Shinikova of Bulgaria during a singles match in the Pan Pacific Open tennis tournament in Tokyo, Tuesday, Sept. 20, 2022. (AP Photo/Hiro Komae)