Kateryna Baindl

On 27 May 2015, the International Tennis Federation announced that Kozlova has been found to have committed an anti-doping rule violation. She was found positive to a doping substance after taking a stimulant, dimethylbutylamine. Kozlova's suspension was reduced to six months starting from 15 February to 15 August 2015.

In February, Kozlova reached her first WTA Tour final at the Taiwan Open, defeating Sabine Lisicki in the semifinals, before losing the championship match to Timea Babos.

At the French Open in May, she became the second player to defeat a defending champion in the first round of the French Open, after a straight sets victory over 2017 champion Jeļena Ostapenko.

Having lost in qualifying, Baindl gained entry to the Poland Open as a lucky loser where wins over 11th seed Maryna Zanevska, qualifier Sara Errani and eighth seed Petra Martić, saw her reach the semifinals. She lost to Ana Bogdan in the last four.

At the Emilia-Romagna Open in Parma, she qualified into the main draw where she was defeated by world No. 7 and top seed, Maria Sakkari.

At the 2023 Australian Open, Baindl defeated Kamilla Rakhimova and Caty McNally to reach the third round of a Grand Slam tournament for the first time in her career. She lost to 17th seed Jeļena Ostapenko.

Baindl reached her second career singles final at the 2023 Budapest Grand Prix, defeating Claire Liu in the semifinals. She lost to lucky loser Maria Timofeeva in the final.

She used a protected ranking to get into the 2024 Wimbledon Championships and the 2024 US Open, but lost in the first round at both events, in straight sets to Laura Siegemund, and to Elisabetta Cocciaretto, respectively.