Kateryna Kozlova
Kateryna Ihorivna Kozlova is a Ukrainian tennis player. On 19 February 2018, she achieved her career-high singles ranking of world No. 62. On 22 October 2012, she peaked at No. 139 in the doubles rankings. To date, Kozlova has won one doubles title on the WTA Challenger series as well as five singles and 13 doubles titles on the ITF Women's Circuit.
Career
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 since 15 February to 15 August 2015.At the 2018 French Open, Kozlova became the second player to defeat a defending champion in the first round of Roland-Garros, after a straight sets victory over 2017 champion Jeļena Ostapenko.
Performance timelines
- Sourced from WTA
Singles
This table is current through the 2019 China Open.
WTA career finals
Singles: 1 (1 runner-up)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | 2018 Taiwan Open – Singles| | Taiwan Open, Taiwan | International | Hard |  Timea Babos | 5–7, 1–6 |
WTA 125K series finals
Singles: 1 (1 title)
ITF Circuit finals
Singles: 9 (5 titles, 4 runner–ups)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Jul 2012 | ITF Vaihingen, Germany | 25,000 | Clay |  Florencia Molinero | 3–6, 7–5, 6–4 |
| Win | 2–0 | Aug 2012 | ITF Kazan, Russia | 50,000 | Hard |  Tara Moore | 6–3, 6–3 |
| Win | 3–0 | Sep 2012 | ITF Shymkent, Kazakhstan | 25,000 | Hard |  Anna Danilina | 6–3, 4–6, 6–4 |
| Loss | 3–1 | Jul 2013 | ITF Istanbul, Turkey | 25,000 | Hard |  Elizaveta Kulichkova | 3–6, 6–4, 0–6 |
| Loss | 3–2 | Sep 2013 | ITF Batumi, Georgia | 25,000 | Hard | Alexandra Panova | 4–6, 6–0, 5–7 |
| Loss | 3–3 | Jun 2014 | ITF Grado, Italy | 25,000 | Clay |  Gioia Barbieri | 4–6, 6–4, 4–6 |
| Win | 4–3 | Jul 2014 | ITF Versmold, Germany | 50,000 | Clay |  Richèl Hogenkamp | 6–4, 6–7, 6–1 |
| Win | 5–3 | Jul 2017 | ITF Rome, Italy | 60,000 | Clay |  Mariana Duque-Marino | 7–6, 6–4 |
| Loss | 5–4 | Nov 2018 | ITF Toronto, Canada | 60,000 | Hard | Quirine Lemoine | 2–6, 3–6 |
Doubles: 22 (13 titles, 9 runner–ups)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | May 2009 | ITF Kharkiv, Ukraine | 10,000 | Clay |  Elina Svitolina | Kateryna Avdiyenko Maria Zharkova | 7–6, 3–6, |
| Loss | 0–2 | Oct 2009 | ITF Belek, Turkey | 10,000 | Clay | Sofiya Kovalets |  Anna Orlik  Kateřina Vaňková | 3–6, 0–6 |
| Loss | 0–3 | May 2010 | ITF Kharkiv, Ukraine | 25,000 | Clay | Elina Svitolina | Lyudmyla Kichenok Nadiia Kichenok | 4–6, 2–6 |
| Loss | 0–4 | Jul 2010 | ITF Pozoblanco, Spain | 50,000 | Clay | Valentyna Ivakhnenko |  Akiko Yonemura Tomoko Yonemura | 4–6, 6–3, 2–6 |
| Win | 1–4 | Jul 2010 | ITF Kharkiv, Ukraine | 25,000 | Clay | Elina Svitolina | Valentyna Ivakhnenko Alyona Sotnikova | 6–3, 7–5 |
| Win | 2–4 | Jun 2011 | ITF Kharkiv, Ukraine | 25,000 | Clay | Valentyna Ivakhnenko |  Melanie Klaffner  Lina Stančiūtė | 6–4, 6–3 |
| Win | 3–4 | Jul 2011 | ITF Contrexéville, France | 50,000 | Clay | Valentyna Ivakhnenko | Erika Sema  Roxane Vaisemberg | 2–6, 7–5, |
| Win | 4–4 | Aug 2011 | ITF Moscow, Russia | 25,000 | Clay | Valentyna Ivakhnenko | Vaszilisza Bulgakova Anna Rapoport | 6–3, 6–0 |
| Loss | 4–5 | Mar 2012 | ITF Moscow, Russia | 25,000 | Carpet | Valentyna Ivakhnenko | Margarita Gasparyan Anna Arina Marenko | 6–3, 6–7, |
| Win | 5–5 | May 2012 | ITF Moscow, Russia | 25,000 | Clay | Valentyna Ivakhnenko | Darya Lebesheva Julia Valetova | 6–1, 6–3 |
| Win | 6–5 | May 2012 | ITF Astana, Kazakhstan | 25,000 | Hard | Valentyna Ivakhnenko | Diana Isaeva Ksenia Kirillova | 6–2, 6–0 |
| Win | 7–5 | Jun 2012 | ITF Qarshi, Uzbekistan | 25,000 | Hard | Valentyna Ivakhnenko | Veronika Kapshay  Teodora Mirčić | 7–5, 6–3 |
| Loss | 7–6 | Jun 2012 | ITF Bukhara, Uzbekistan | 25,000 | Hard | Valentyna Ivakhnenko | Lyudmyla Kichenok Nadiia Kichenok | 5–7, 5–7 |
| Loss | 7–7 | Jul 2012 | ITF Donetsk, Ukraine | 50,000 | Hard | Valentyna Ivakhnenko | Lyudmyla Kichenok Nadiia Kichenok | 2–6, 5–7 |
| Win | 8–7 | Aug 2012 | ITF Kazan, Russia | 50,000 | Clay | Valentyna Ivakhnenko | Lyudmyla Kichenok Nadiia Kichenok | 6–4, 6–7, |
| Win | 9–7 | Sep 2012 | ITF Shymkent, Kazakhstan | 25,000 | Hard | Valentyna Ivakhnenko |  Nigina Abduraimova  Ksenia Palkina | 6–2, 6–4 |
| Win | 10–7 | Aug 2013 | ITF Kazan, Russia | 50,000 | Clay | Valentyna Ivakhnenko |  Başak Eraydın Veronika Kapshay | 6–4, 6–1 |
| Win | 11–7 | Sep 2013 | ITF Batumi, Georgia | 25,000 | Clay | Valentyna Ivakhnenko |  Christina Shakovets Alona Fomina | 6–0, 6–4 |
| Win | 12–7 | Jan 2014 | ITF Andrézieux-Bouthéon, France | 25,000 | Hard | Yuliya Beygelzimer |  Timea Bacsinszky Kristina Barrois | 6–3, 3–6, |
| Loss | 12–8 | Feb 2014 | ITF Grenoble, France | 25,000 | Hard | Margarita Gasparyan |  Sofia Shapatava Anastasiya Vasylyeva | 1–6, 4–6 |
| Win | 13–8 | Feb 2014 | ITF Moscow, Russia | 25,000 | Hard | Valentyna Ivakhnenko | Veronika Kudermetova Sviatlana Pirazhenka | 7–6, 6–4 |
| Loss | 13–9 | Aug 2018 | ITF Vancouver, Canada | 100,000 | Hard | Arantxa Rus |  Desirae Krawczyk  Giuliana Olmos | 2–6, 5–7 |