2021: First ATP doubles title and top 100 debut

Zieliński made his top 100 doubles debut at No. 99 on 1 November 2021 after winning his first ATP Tour doubles title at the 2021 Moselle Open with his compatriot Hubert Hurkacz.^[1]

2022: First Major quarterfinal, second ATP title and top 35 debut

In January 2022, he made his debut participating as part of the Polish team at the 2022 ATP Cup, where he played doubles with Szymon Walków and won against Georgia and Argentina. After Hurkacz's win over Diego Schwartzman sealed the victory for Poland over Argentina, the Polish team advanced to the semifinals.^[2] The pair won again against Spain in doubles, but the team did not advance to the finals.

He reached the top 50 in doubles at world No. 49 on 18 July 2022. In August, at his debut at a Masters 1000 level, he reached his first semifinal at the 2022 National Bank Open also with Hurkacz, defeating sixth seeds Puetz/Venus in the first round,^[3] Bopanna/Middelkoop in the second and fourth seeds, and French Open champions Arévalo/Rogers in the quarterfinals.^[4][5]

At the US Open, he reached the quarterfinals of a Grand Slam for the first time in his career with partner Hugo Nys, defeating 10th seeded pair Jamie Murray/Bruno Soares and Ariel Behar/Gonzalo Escobar. As a result, he made his top 40 debut in the rankings. The pair won their first title at the 2022 Moselle Open.^[6]

2023: Major final and Masters doubles title, World No. 7

At the 2023 Australian Open, he achieved his career best Grand Slam result by advancing to the semifinals with partner Hugo Nys. The pair defeated Rafael Matos/David Vega Hernández, Max Purcell/Jordan Thompson, second seeds Rajeev Ram/Joe Salisbury and Benjamin Bonzi/Arthur Rinderknech in the quarterfinals. The pair beat the French duo of Jérémy Chardy/Fabrice Martin in the semifinals to advance to their first Grand Slam final, where they lost to Australians Rinky Hijikata and Jason Kubler.^[7]

Following their first Masters 1000 title in Rome, Zielinski reached a career high ranking of No. 12 on 22 May 2023.^[8] Following the 2023 French Open, he made his debut in the top 10 in the rankings at world No. 9 on 12 June 2023.

At the 2023 Moselle Open in Metz the Monegasque/Polish pair defended their crown but came short of qualifying for the year-end 2023 ATP Finals, finishing ninth in the ATP race.^[9]

2024: First Polish mixed doubles champion

At the 2024 Australian Open he reached the quarterfinals with Nys but lost to unseeded pair Dominik Koepfer and Yannick Hanfmann and could not defend their previous year runner-up points. Despite the loss in the doubles event, seeded third, he reached the final in the mixed doubles partnering Hsieh Su-wei, and they won their first Major mixed doubles title, defeating second seeds Desirae Krawczyk and Neal Skupski.^[10] They saved a championship point en route to Zieliński's first Grand Slam title and Hsieh's seventh, and first on hardcourts. Zieliński became the first Polish finalist and champion at a mixed doubles event.^[11][12]

At the 2024 Abierto Mexicano Telcel in Acapulco he won his first ATP 500 title with Nys defeating top pair of Santiago Gonzalez and Neal Skupski.^[13]

Men's doubles

Mixed doubles

Men's Doubles: 1 (1 runner-up)

More information Result, Year ...

Result	Year	Tournament	Surface	Partner	Opponents	Score
Loss	2023	Australian Open	Hard	Hugo Nys	Rinky Hijikata Jason Kubler	4–6, 6–7(4–7)

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Mixed Doubles: 1 (1 title)

More information Result, Year ...

Result	Year	Tournament	Surface	Partner	Opponents	Score
Win	2024	Australian Open	Hard	Hsieh Su-wei	Desirae Krawczyk Neal Skupski	6–7(5–7), 6–4, [11–9]

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Doubles: 11 (5 titles, 6 runner-ups)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jul 2021	Swiss Open Gstaad, Switzerland	250 Series	Clay	Szymon Walków	Marc-Andrea Hüsler Dominic Stricker	1–6, 6–7(7–9)
Win	1–1	Sep 2021	Moselle Open, France	250 Series	Hard (i)	Hubert Hurkacz	Hugo Nys Arthur Rinderknech	7–5, 6–3
Loss	1–2	Apr 2022	Grand Prix Hassan II, Morocco	250 Series	Clay	Andrea Vavassori	Rafael Matos David Vega Hernández	1–6, 5–7
Loss	1–3	Aug 2022	Winston-Salem Open, United States	250 Series	Hard	Hugo Nys	Matthew Ebden Jamie Murray	4–6, 2–6
Win	2–3	Sep 2022	Moselle Open, France (2)	250 Series	Hard (i)	Hugo Nys	Lloyd Glasspool Harri Heliövaara	7–6(7–5), 6–4
Loss	2–4	Jan 2023	Australian Open, Australia	Grand Slam	Hard	Hugo Nys	Rinky Hijikata Jason Kubler	4–6, 6–7(4–7)
Win	3–4	May 2023	Rome Masters, Italy	Masters 1000	Clay	Hugo Nys	Robin Haase Botic van de Zandschulp	7–5, 6–1
Loss	3–5	Oct 2023	Swiss Indoors, Switzerland	500 Series	Hard (i)	Hugo Nys	Santiago González Édouard Roger-Vasselin	7–6(10–8), 6–7(3–7), [1–10]
Win	4–5	Nov 2023	Moselle Open, France (3)	250 Series	Hard (i)	Hugo Nys	Constantin Frantzen Hendrik Jebens	6–4, 6–4
Win	5–5	Mar 2024	Mexican Open, Mexico	500 Series	Hard	Hugo Nys	Santiago González Neal Skupski	6–3, 6–2
Loss	5–6	Apr 2024	Barcelona Open, Spain	500 Series	Clay	Hugo Nys	Máximo González Andrés Molteni	6–4, 4–6, [9–11]

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Singles: 1 (0–1)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Nov 2019	M15 Heraklion, Greece	Futures	Hard	Alexander Erler	5–7, 1–6

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Doubles: 31 (19–12)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Oct 2014	Egypt F29, Sharm El Sheikh	Futures	Hard	Libor Salaba	Matwe Middelkoop Mohamed Safwat	6–7(1–7), 3–6
Loss	0–2	Jun 2015	Georgia F5, Pantiani	Futures	Clay	Karol Drzewiecki	Marco Bortolotti Francesco Moncagatto	3–6, 2–6
Win	1–2	Aug 2015	Poland F3, Poznań	Futures	Clay	Adam Majchrowicz	Markus Eriksson Daniel Windahl	6–0, 5–7, [10–2]
Loss	1–3	Jul 2016	Lithuania F1, Vilnius	Futures	Clay	Michał Dembek	Laurynas Grigelis Lukas Mugevicius	5–7, 4–6
Win	2–3	Jul 2016	Estonia F1, Parnu	Futures	Clay	Michał Dembek	Vladimir Polyakov Evgenii Tiurnev	7–5, 7–5
Win	3–3	Aug 2018	Poland F3, Koszalin	Futures	Clay	Kacper Żuk	Paweł Ciaś Michał Dembek	6–2, 6–2
Win	4–3	Jul 2019	M15 Wrocław, Poland	World Tennis Tour	Clay	Kacper Żuk	Jan Galka Piotr Galus	6–4, 6–3
Win	5–3	Sep 2019	M15 Antalya, Turkey	World Tennis Tour	Clay	Kacper Żuk	Adil Kalyanpur Kelsey Stevenson	3–6, 6–1, [10–8]
Loss	5–4	Sep 2019	M25 Stockholm, Sweden	World Tennis Tour	Hard	Kacper Żuk	Filip Bergevi Florian Lakat	3–6, 6–7(3–7)
Win	6–4	Oct 2019	M25 Falun, Sweden	World Tennis Tour	Hard	Florian Lakat	Janis Podzus Martins Podzus	7–6(7–5), 6–1
Win	7–4	Oct 2019	M15 Sharm El Sheikh, Egypt	World Tennis Tour	Hard	Julian Cash	Piotr Matuszewski Daniel Michalski	7–6(7–2), 7–6(7–3)
Win	8–4	Oct 2019	M15 Sharm El Sheikh, Egypt	World Tennis Tour	Hard	Kacper Żuk	Pablo Vivero Gonzalez Ching-Mou Yu	6–3, 6–1
Win	9–4	Nov 2019	M15 Heraklion, Greece	World Tennis Tour	Hard	Luke Johnson	Adrian Bodmer Jonas Trinker	1–6, 6–2, [12–10]
Loss	9–5	Nov 2019	M15 Heraklion, Greece	World Tennis Tour	Hard	Luke Johnson	Alexander Erler Neil Oberleitner	4–6, 0–6
Win	10–5	Jan 2020	M25 Nussloch, Germany	World Tennis Tour	Carpet	Kacper Żuk	Johannes Haerteis Peter Heller	6–3, 6–4
Win	11–5	Feb 2020	M25 Barnstaple, United Kingdom	World Tennis Tour	Hard	Kacper Żuk	Evan Hoyt Luke Johnson	6–3, 7–6(7–5)
Win	12–5	Feb 2020	M25 Glasgow, United Kingdom	World Tennis Tour	Hard	Szymon Walków	Simon Freund Evan Hoyt	6–1, 6–1
Win	13–5	Feb 2020	M25 Sunderland, United Kingdom	World Tennis Tour	Hard	Szymon Walków	Jesper De Jong Bart Stevens	6–4, 6–4
Win	14–5	Aug 2020	M25 Poznań, Poland	World Tennis Tour	Clay	Kacper Żuk	Mikolaj Lorens Wojciech Marek	7–5, 6–2
Loss	14–6	Sep 2020	M25 Prague, Czech Republic	World Tennis Tour	Clay	Lucas Miedler	Sebastián Báez Pedro Cachin	6–7(4–7), 1–6
Win	15–6	Sep 2020	Sibiu, Romania	Challenger	Clay	Hunter Reese	Robert Galloway Hans Hach	6–4, 6–2
Loss	15–7	Feb 2021	Biella, Italy	Challenger	Hard	Szymon Walków	Luis David Martínez David Vega Hernández	3–6, 6–3, [8–10]
Loss	15–8	Apr 2021	Split, Croatia	Challenger	Clay	Szymon Walków	Andrey Golubev Aleksandr Nedovyesov	5–7, 7–6(7–5), [5–10]
Win	16–8	Apr 2021	Split, Croatia	Challenger	Clay	Szymon Walków	Grégoire Barrère Albano Olivetti	6–2, 7–5
Win	17–8	Jul 2021	Braunschweig, Germany	Challenger	Clay	Szymon Walków	Ivan Sabanov Matej Sabanov	6–4, 4–6, [10–4]
Win	18–8	Aug 2021	Meerbusch, Germany	Challenger	Clay	Szymon Walków	Dustin Brown Robin Haase	6–3, 6–1
Loss	18–9	Aug 2021	Mallorca, Spain	Challenger	Hard	Fernando Romboli	Karol Drzewiecki Sergio Martos Gornés	4–6, 6–4, [3–10]
Win	19–9	Mar 2022	Roseto degli Abruzzi, Italy	Challenger	Clay	Hugo Nys	Roman Jebavý Philipp Oswald	7–6(7–2), 4–6, [10–3]
Loss	19–10	Mar 2022	Marbella, Spain	Challenger	Clay	Hugo Nys	Roman Jebavý Philipp Oswald	6–7(6–8), 6–3, [3–10]
Loss	19–11	May 2022	Bordeaux, France	Challenger	Clay	Hugo Nys	Rafael Matos David Vega Hernández	4-6, 0-6
Loss	19–12	Mar 2023	Phoenix, USA	Challenger	Hard	Hugo Nys	Nathaniel Lammons Jackson Withrow	7–6(7–1), 4–6, [8–10]

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