Unseeded Bojana Jovanovski beat seventh seed Jelena Ostapenko in the first round of the Tashkent Open on Tuesday.
The Serb needed three sets against Latvia's Ostapenko, eventually winning 4-6, 6-2, 7-5 in a match that lasted 109 minutes.
In other matches, Aleksandra Krunic of Serbia was too good for Estonia's Anett Kontaveit, winning 6-2, 6-4 and Nigina Abduraimova of Uzbekistan beat Croatia's Petra Martic 6-4, 6-0.
Ukraine's Kateryna Kozlova was a comfortable winner against Klara Koukalova of the Czech Republic coming through 6-4, 6-0 and Kazakhstan's Yaroslava Shvedova caused a slight upset when beating eighth-seeded Andreea Mitu of Romania 7-5, 6-3.
Russia's Evgeniya Rodina had little trouble beating Urszula Radwanska of Poland 6-2, 6-4 and fifth-seeded Katerina Siniakova of Czech Republic beat Polish qualifier Paula Kania 6-2, 7-6(5).
Top seed Annika Beck of Germany had little trouble beating Russia's Elizaveta Kulichkova 6-3, 6-1 and Croatia's Donna Vekic beat Kiki Bertens of Netherlands in three sets, winning 6-3, 1-6, 6-3.
Sweden's fourth seed Johanna Larsson easily got past Stefanie Voegele of Switzerland) 6-3, 6-3 and Jana Cepelova of Slovakia easily beat Sabina Sharipova of Uzbekistan 6-2, 6-1.
In an upset, Aliaksandra Sasnovich of Belarus beat third seed Polona Hercog from Slovenia 4-6, 6-3, 6-3.