Marta Kostyuk has achieved notable success on the WTA circuit, particularly in singles and doubles competitions. As of 2026, she has secured three singles titles, including victories in Madrid and Rouen in 2026, and Austin in 2023. She has also been a finalist three times, with her 2026 finals in Brisbane, and 2024 in San Diego and Stuttgart.
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In doubles, Kostyuk has won two titles: Birmingham in 2023 alongside Barbora Krejcikova, and Portoroz in 2022 with Marie Bouzkova. Additionally, she was a finalist in Tenerife in 2021 with Lyudmyla Kichenok. Her performance in the WTA 125 events includes a win at Limoges in 2022 with Ekaterina Kalashnikova.
In 2025, Kostyuk recorded three quarter-final finishes at WTA 1000 events—Doha, Madrid, and Montreal—where she lost to the eventual champions. She reached the fourth round at the US Open, marking her second Grand Slam achievement after previously reaching the quarter-finals at the 2024 Australian Open.
Kostyuk displayed strong performance in 2024, finishing as the runner-up in two WTA 500 finals and earning five Top 10 victories, which helped her break into the Top 20 for the first time on May 6, 2024, ending the year ranked No. 18.
Her breakthrough year in singles came in 2023 when she won her first title in Austin, defeating Anna Gracheva, and captured a doubles title in Birmingham with Krejcikova. Kostyuk achieved quarter-final finishes at WTA 500 events in Adelaide 1 and Washington, and reached a career-high singles ranking of No. 32 on August 7, 2023, and No. 27 in doubles on May 8, 2023.
Kostyuk's best result in 2022 was a semi-final appearance at Granby, along with reaching the third round at the Australian Open and Eastbourne. In the latter half of 2021, she made quarter-finals in Chicago and semi-finals in Cluj-Napoca, enhancing her ranking to the Top 50 by November.
Her clay court performance includes a round of 16 run at the French Open and a semi-final finish in Istanbul. She started 2021 with her first WTA semi-final in Abu Dhabi. Kostyuk broke into the Top 100, achieving a ranking of No. 97 on November 2, 2020, after successful ITF Circuit finals. Her journey in tennis began with her main draw debut at the 2018 Australian Open, where she reached the third round.
In 2017, she won the Australian Open girls' singles title and made significant strides in junior rankings, even after her first professional appearance in 2016.