ISTANBUL, Turkey - Ukraine's Dayana Yastremska earned her first career WTA main draw victory to open play at the TEB BNP Paribas Istanbul Cup on Monday, rallying from a set down to see off Andrea Petkovic, 3-6, 6-0, 6-3.
The 16-year-old, the 2016 girls' singles finalist at Wimbledon, is currently ranked World No.420 and fell in the first round in Istanbul a year ago in her first WTA main draw match.
The 16-year-old blasted 32 winners to upset the No.8 seed, who hit just six, as Yastremska also broke serve seven times. She ran off four straight games from 0-2 in the final set, and secured the decisive break of the Petkovic serve at love in the eighth game.
Though she faced a break point in the decider as she served for the match, the Ukrainian saved it with aplomb and converted her first career victory over a top 100 player on her first match point.
Also in first round main draw action, Greece's Maria Sakkari ousted last year's runner-up Danka Kovinic in straight sets, 7-6(3), 6-3.
The six qualifying spots were also decided on Monday, as all six players to earn their place in the main draw were unseeded in the qualifying draw. Romania's Alexandra Cadantu, Switzerland's Conny Perrin, Russia's Victoria Kamenskaya, France's Fiona Ferro, Russia's Elizaveta Kulichkova and wildcard Basak Eraydin of Turkey.
First round action continues on Tuesday, as No.7 seed Tsvetana Pironkova faces hometown favorite Eraydin and No.4 seed Eugenie Bouchard takes on Jana Cepelova. Also in action are No.3 seed Irina-Camelia Begu and No.5 seed Sorana Cirstea.