Top-seeded Monica Niculescu of Romania was knocked out in the first round of the Tashkent Open on Tuesday, falling 2-6, 6-3, 7-5 to 135th-ranked Karin Knapp of Italy.
Niculescu, who also lost in the first round of the U.S. Open, looked in control after the first set but was broken in the eighth game of the second. She then lost the final three games of the decider.
Croatian qualifier Donna Vekic upset fourth-seeded Magdalena Rybarikova of Slovakia 7-6 (3), 6-3, and Russian qualifier Anna Chakvetadze defeated Lesia Tsurenko of Ukraine 6-4, 6-3. Eighth-seeded Galina Voskoboeva of Kazakhstan rallied from a set down to beat Vesna Dolonc of Serbia, 3-6, 6-1, 6-0.