Petra Marčinko

Petra Marčinko (born 4 December 2005) is a Croatian tennis player. Marčinko has a career-high WTA singles ranking of world No. 45, achieved on 13 July 2026, and a best doubles ranking of No. 372, attained on 20 July 2026.

She has won one WTA Tour singles title at the 2026 Morocco Open. Marčinko has also won one WTA 125 singles title as well as 11 titles in singles and four in doubles on the ITF Women's Circuit.

She achieved the No. 1 junior ranking on 13 December 2021.

Career overview 2021–2022: Junior No. 1 & professional debut On the ITF Junior Circuit, Marčinko had won nine singles and seven doubles titles. In December 2021, she completed a remarkable late-season surge as singles and doubles wins at the Orange Bowl championship saw her climb nine places to finish as the year-end junior world No. 1 on 13 December 2021.

At the beginning of 2022, she won her first junior Grand Slam title at the Australian Open, defeating Sofia Costoulas in the final, in straight sets.

As a 16-year-old, Marčinko made her WTA Tour debut at the 2022 Morocco Open in Rabat as a wildcard player defeating Rebecca Peterson, before losing to Astra Sharma in the second round.

2023–2025: First WTA 125 title She won her sixth consecutive ITF Women's Circuit title at the 2023 Caldas da Rainha Ladies Open, defeating Léolia Jeanjean in the final in straight sets, and set the new Croatian record for the youngest women's player to win six professional singles titles before turning 18.

Having been given a wildcard entry, Marčinko finished runner-up at the 2024 WTA 125 Montreux Ladies Open, losing to seventh seed Irina-Camelia Begu in the final, in three sets.

In July 2025, she won her first WTA 125 title at the ATV Tennis Open in Rome, defeating Oksana Selekhmeteva in the final.

2026: Major & top 50 debuts, WTA Tour title Marčinko made her major debut at the Australian Open where she directly entered the main-draw and recorded her first win over Tatjana Maria, before losing to Peyton Stearns in the second round.

Seeded sixth, Marčinko won her maiden tour title at the Rabat Grand Prix, defeating qualifier Vera Zvonareva, wildcard entrant Yelyzaveta Kotliar, second seed Jéssica Bouzas Maneiro and Jil Teichmann en-route to the final, which she won when her opponent, Anhelina Kalinina, retired due to injury in the second set. As a result of claiming the trophy, Marčinko reached a new career-high ranking of world No. 51 on 25 May 2026 and the top 50 on 8 June 2026.

Entering the main draw as a lucky loser at the Eastbourne Open, she recorded wins over fellow Croatian Antonia Ružić, qualifier Kimberly Birrell and Caty McNally to reach her first WTA grass court semifinal. Marčinko retired due to injury after losing the first set of her last four match against second seed Madison Keys.

Seeded second at the Iași Open, Marčinko defeated wildcard entrant Nadia Podoroska and qualifier Elina Avanesyan.before losing to Tamara Zidanšek in the quarterfinals.

Grand Slam singles performance timeline

WTA Tour finals Singles: 1 (title) LegendWTA 250 (1–0)Finals by surfaceClay (1–0)

WTA 125 finals Singles: 2 (1 title, 1 runner-up) ResultW–LDateTournamentSurfaceOpponentScoreLoss 0–1 Montreux Ladies Open, Switzerland Clay Irina-Camelia Begu 6–1, 3–6, 0–6Win 1–1 ATV Rome Open, Italy Clay Oksana Selekhmeteva 6–3, 4–6, 6–3

ITF Circuit finals

Singles: 12 (11 titles, 1 runner-up) LegendW100 tournaments (3–0)W80 tournaments (1–0)W60/75 tournaments (4–1)W25 tournaments (3–0)

Doubles: 5 (4 titles, 1 runner-up) LegendW75 tournaments (2–0)W15 tournaments (2–1)

Junior finals

Grand Slam tournaments

Singles: 1 (title)

Fed Cup participation Singles (12–3)

Doubles (4–3)

United Cup (0–2) Group membershipUnited Cup (0–2)Matches by surfaceHard (0–2)Matches by typeDoubles (0–2)Matches by settingOutdoors (0–2)