Anett Kontaveit, Sara Sorribes Tormo, Maria Sakkari and Barbora Krejcikova booked their places in the second round of the Ostrava Open.
Runner-up in 2016, Karolina Pliskova made a second-round exit at the US Open.
Japanese star and fourth seed Naomi Osaka rallied past Anett Kontaveit in three sets at the WTA Premier tournament in New York.
While Serena Williams departed, fourth seed Naomi Osaka booked her spot in the quarter-finals of the WTA Premier event.
After being pushed at the Western & Southern Open, Serena Williams and Naomi Osaka reached the last 16.
Fiona Ferro followed up her win over home hope Camila Giorgi by beating Anett Kontaveit in the Palermo Open final.
Anett Kontaveit akan berhitung dengan Fiona Ferro dalam perlawanan akhir Terbuka Palermo, awal pagi esok, bagi Kejohanan Tenis WTA pertama yang dianjurkan sejak Mac lalu.
Top seed Petra Martic fell short against Anett Kontaveit in the Palermo Open semi-finals, while Italian hopes were dashed by a Frenchwoman.
Petra Martic and Anett Kontaveit are the last two seeds standing at the Palermo Ladies Open.
Petra Martic and Anett Kontaveit are into the last eight at the Palermo Ladies Open.