2019: Maiden ATP title

At the 2019 Los Cabos Open, Nys won his maiden doubles title with partner Romain Arneodo.^[2]

2021: French Open quarterfinal, two doubles titles, top 50

Nys won his second doubles title at the Estoril Open, with partner Tim Pütz.^[3]

Later in May, Nys won his next doubles title at the Lyon Open, again with Pütz.^[4] As a result, he reached a career-high of No. 53 in doubles on 24 May 2021.

The Nys/Pütz duo reached the quarterfinals of the 2021 French Open, where they were defeated by eventual runner-ups Kazakh duo Bublik/Golubev.

2022: US Open quarterfinal, fourth ATP title

At the US Open, he reached the quarterfinals of a Grand Slam for the second time in his career with partner Jan Zieliński, defeating 10th seeded pair Jamie Murray/Bruno Soares and Ariel Behar/Gonzalo Escobar. The pair won their first title at the 2022 Moselle Open.^[5]

2023: Historic Major final and Masters title, top 15 debut

With Zieliński, Nys reached his first Grand Slam final, defeating second seeds Rajeev Ram and Joe Salisbury on the way.^[6] He became the first Monegasque player to reach a Grand Slam final.^[7] They were defeated by wildcard Australian pair of Jason Kubler and Rinky Hijikata in the championship match.^[8] He reached the top 20 on 13 February 2023.

Following their maiden Masters 1000 title in Rome, Nys reached a new career high ranking of No. 14 on 22 May 2023. He became the first Monegasque player to win an ATP Masters 1000 title.^[9]

Men's doubles

Mixed doubles

Doubles: 12 (6 titles, 6 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Feb 2018	Open Sud de France, France	250 Series	Hard (i)	Ben McLachlan	Ken Skupski Neal Skupski	6–7(2–7), 4–6
Win	1–1	Aug 2019	Los Cabos Open, Mexico	250 Series	Hard	Romain Arneodo	Dominic Inglot Austin Krajicek	7–5, 5–7, [16–14]
Win	2–1	May 2021	Estoril Open, Portugal	250 Series	Clay	Tim Pütz	Luke Bambridge Dominic Inglot	7–5, 3–6, [10–3]
Win	3–1	May 2021	Lyon Open, France	250 Series	Clay	Tim Pütz	Pierre-Hugues Herbert Nicolas Mahut	6–4, 5–7, [10–8]
Loss	3–2	Sep 2021	Moselle Open, France	250 Series	Hard (i)	Arthur Rinderknech	Hubert Hurkacz Jan Zieliński	5–7, 3–6
Loss	3–3	Oct 2021	St. Petersburg Open, Russia	250 Series	Hard (i)	Andrey Golubev	Jamie Murray Bruno Soares	3–6, 4–6
Loss	3–4	Aug 2022	Winston-Salem Open, United States	250 Series	Hard	Jan Zieliński	Matthew Ebden Jamie Murray	4–6, 2–6
Win	4–4	Sep 2022	Moselle Open, France	250 Series	Hard (i)	Jan Zieliński	Lloyd Glasspool Harri Heliövaara	7–6(7–5), 6–4
Loss	4–5	Jan 2023	Australian Open, Australia	Grand Slam	Hard	Jan Zieliński	Rinky Hijikata Jason Kubler	4–6, 6–7(4–7)
Win	5–5	May 2023	Rome Masters, Italy	Masters 1000	Clay	Jan Zieliński	Robin Haase Botic van de Zandschulp	7–5, 6–1
Loss	5–6	Oct 2023	Swiss Indoors, Switzerland	500 Series	Hard (i)	Jan Zieliński	Santiago González Édouard Roger-Vasselin	7–6(10–8), 6–7(3–7), [1–10]
Win	6–6	Nov 2023	Moselle Open, France (2)	250 Series	Hard (i)	Jan Zieliński	Constantin Frantzen Hendrik Jebens	6–4, 6–4

Singles: 12 (6–6)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Win	1–0	Sep 2012	Sweden F4, Uppsala	Futures	Hard (i)	Robin Olin	6–0, 5–7, 6–3
Loss	1–1	May 2013	Turkey F20, Antalya	Futures	Hard	Mate Delić	6–3, 5–7, 4–6
Loss	1–2	Sep 2013	France F14, Bagnères-de-Bigorre	Futures	Hard	Alexandre Penaud	6–1, 4–6, 4–6
Win	2–2	Apr 2014	Turkey F12, Antalya	Futures	Hard	Robin Kern	6–0, 6–2
Win	3–2	Jul 2014	Turkey F23, Istanbul	Futures	Hard	Aldin Šetkić	6–4, 6–3
Win	4–2	Jul 2014	Turkey F24, Istanbul	Futures	Hard	Matija Pecotić	7–6(7–5), 3–6, 7–6(7–4)
Loss	4–3	Jan 2015	Turkey F1, Antalya	Futures	Hard	Shuichi Sekiguchi	7–6(11–9), 4–6, 3–6
Loss	4–4	Apr 2015	Turkey F16, Antalya	Futures	Hard	Yannick Jankovits	7–6(7–4), 0–6, 1–6
Win	5–4	Jun 2015	Egypt F21, Sharm El Sheikh	Futures	Hard	Javier Pulgar-García	6–3, 6–1
Loss	5–5	Jan 2016	France F2, Bressuire	Futures	Hard (i)	Constant Lestienne	7–6(7–4), 1–6, 4–6
Win	6–5	Jan 2016	France F3, Veigy-Foncenex	Futures	Carpet (i)	Antal van der Duim	6–4, 6–3
Loss	6–6	Sep 2016	France F17, Bagnères-de-Bigorre	Futures	Hard	Maxime Authom	6–4, 6–7(9–11), 0–6

Doubles: 70 (38–32)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Oct 2009	France F18, Saint-Dizier	Futures	Hard (i)	Jérémy Corbière	Baptiste Bayet Grégoire Burquier	3–6, 1–6
Loss	0–2	Jun 2012	Spain F17, Melilla	Futures	Hard	Jules Marie	Iván Arenas-Gualda Jaime Pulgar-García	7–6(8–6), 1–6, [7–10]
Loss	0–3	Jul 2012	France F12, Montauban	Futures	Clay	Pierre-Hugues Herbert	Jonathan Eysseric Nicolas Renavand	7–6(7–3), 4–6, [9–11]
Win	1–3	Aug 2012	Belgium F7, Eupen	Futures	Clay	Teri Groll	Germain Gigounon James Junior Storme	6–4, 6–3
Loss	1–4	Sep 2012	France F18, Sarreguemines	Futures	Carpet (i)	Jean Andersen	Julien Obry Alexandre Penaud	6–2, 1–6, [8–10]
Win	2–4	Oct 2012	France F21, La Roche-sur-Yon	Futures	Hard (i)	Jean Andersen	Moritz Baumann Tim Pütz	7–6(8–6), 7–6(7–3)
Win	3–4	Mar 2013	France F6, Saint-Raphaël	Futures	Hard (i)	Romain Arneodo	Simon Cauvard Alexandre Penaud	6–7(6–8), 6–4, [10–5]
Win	4–4	May 2013	Turkey F20, Antalya	Futures	Hard	Davy Sum	Claudio Fortuna Matthieu Viérin	6–2, 6–0
Loss	4–5	Jun 2013	Serbia F2, Belgrade	Futures	Clay	Romain Arneodo	Patrik Fabian Adrian Partl	4–6, 1–6
Win	5–5	Jun 2013	France F10, Toulon	Futures	Clay	Benjamin Balleret	David Couronne Vincent Verpeaux	7–5, 6–4
Win	6–5	Sep 2013	France F14, Bagnères-de-Bigorre	Futures	Hard	Antoine Benneteau	Riccardo Ghedin Claudio Grassi	6–3, 4–6, [10–2]
Win	7–5	Sep 2013	Sweden F4, Gothenburg	Futures	Hard (i)	Jesper Brunström	Pierre Bonfre Viktor Stjern	6–3, 7–6(7–5)
Win	8–5	Oct 2013	France F19, Saint-Dizier	Futures	Hard (i)	Germain Gigounon	David Rice Sean Thornley	7–6(7–4), 6–4
Win	9–5	Oct 2013	Mouilleron-le-Captif, France	Challenger	Hard (i)	Fabrice Martin	Henri Kontinen Adrián Menéndez Maceiras	3–6, 6–3, [10–8]
Loss	9–6	Feb 2014	Italy F2, Rovereto	Futures	Carpet (i)	Fabrice Martin	Marco Crugnola Luca Vanni	4–6, 4–6
Loss	9–7	Mar 2014	France F7, Saint-Raphaël	Futures	Hard (i)	Fabrice Martin	Romain Arneodo Benjamin Balleret	2–6, 6–7(2–7)
Loss	9–8	Jun 2014	Croatia F13, Bol	Futures	Clay	Tim Nekic	Gastón-Arturo Grimolizzi Giorgio Portaluri	3–6, 4–6
Win	10–8	Jul 2014	Turkey F23, Istanbul	Futures	Hard	Federico Zeballos	Tuna Altuna Michal Schmid	7–6(7–3), 3–6, [10–3]
Win	11–8	Jul 2014	Belgium F7, Middelkerke	Futures	Hard	Élie Rousset	Éric Fomba Florian Lakat	6–3, 6–1
Loss	11–9	Aug 2014	Belarus F1, Minsk	Futures	Hard	Dane Propoggia	Sergey Betov Aliaksandr Bury	6–7(0–7), 6–7(5–7)
Loss	11–10	Aug 2014	Belarus F2, Minsk	Futures	Hard	Dane Propoggia	Sergey Betov Aliaksandr Bury	3–6, 5–7
Loss	11–11	Sep 2014	France F20, Sarreguemines	Futures	Carpet (i)	Élie Rousset	Erik Crepaldi Pirmin Haenle	6–7(5–7), 6–7(3–7)
Win	12–11	Oct 2014	France F21, Nevers	Futures	Hard (i)	Olivier Charroin	Romano Frantzen Darren Walsh	6–4, 6–4
Loss	12–12	Mar 2015	France F5, Balma	Futures	Hard (i)	Alexandre Sidorenko	Romain Bauvy Yanais Laurent	3–6, 6–7(4–7)
Loss	12–13	Mar 2015	Tunisia F10, El Kantaoui	Futures	Hard	Benjamin Balleret	Thomas Fabbiano Giorgio Portaluri	2–6, 6–7(3–7)
Win	13–13	Mar 2015	Tunisia F11, El Kantaoui	Futures	Hard	Benjamin Balleret	Thomas Fabbiano Giorgio Portaluri	7–5, 2–6, [10–4]
Win	14–13	Apr 2015	Turkey F16, Antalya	Futures	Hard	Yannick Jankovits	Marat Deviatiarov Michael Geerts	7–6(8–6), 6–1
Loss	14–14	May 2015	Turkey F17, Antalya	Futures	Hard	Antoine Bellier	Lucas Miedler Maximilian Neuchrist	6–4, 3–6, [7–10]
Loss	14–15	Jun 2015	Egypt F21, Sharm El Sheikh	Futures	Hard	Jaime Pulgar-García	Juan Matías González Carrasco Emiliano Franco Vecchia	6–7(4–7), 7–5, [5–10]
Win	15–15	Jun 2015	France F10, Mont-de-Marsan	Futures	Hard (i)	Romain Arneodo	Théo Fournerie Louis Tessa	6–1, 7–5
Win	16–15	Jul 2015	Turkey F26, Istanbul	Futures	Hard	Yannick Jankovits	Sarp Ağabigün Muhammet Haylaz	2–6, 7–5, [10–6]
Win	17–15	Aug 2015	France F16, Ajaccio	Futures	Hard	Romain Arneodo	Sanchai Ratiwatana Sonchat Ratiwatana	2–6, 6–4, [10–5]
Win	18–15	Aug 2015	Switzerland F4, Sion	Futures	Clay	Tak Khunn Wang	Federico Coria Siméon Rossier	6–2, 6–2
Win	19–15	May 2016	Turkey F18, Antalya	Futures	Hard	Miķelis Lībietis	Sarp Ağabigün Altuğ Çelikbilek	6–2, 6–2
Win	20–15	May 2016	Turkey F19, Antalya	Futures	Hard	Miķelis Lībietis	Katsuki Nagao Hiromasa Oku	4–6, 6–2, [10–3]
Win	21–15	Jun 2016	Zimbabwe F1, Harare	Futures	Hard	Andrea Vavassori	Benjamin Lock Courtney John Lock	6–3, 6–3
Win	22–15	Jul 2016	Zimbabwe F2, Harare	Futures	Hard	Vishnu Vardhan	Nicolaas Scholtz Tucker Vorster	6–4, 6–2
Win	23–15	Jul 2016	Zimbabwe F3, Harare	Futures	Hard	Vishnu Vardhan	Benjamin Lock Courtney John Lock	6–7(5–7), 6–4, [10–5]
Win	24–15	Jul 2016	France F16, Ajaccio	Futures	Hard	Romain Arneodo	Romain Jouan Joan Soler	7–5, 6–2
Win	25–15	Aug 2016	Spain F24, Béjar	Futures	Hard	Yannick Mertens	Alexander Centenari Sami Reinwein	6–4, 7–6(7–3)
Loss	25–16	Aug 2016	Switzerland F3, Collonge-Bellerive	Futures	Clay	Antoine Bellier	Gonçalo Oliveira Fabien Reboul	3–6, 5–7
Loss	25–17	Sep 2016	France F18, Mulhouse	Futures	Hard (i)	Maxime Authom	Andreas Beck Grégoire Jacq	4–6, 3–6
Win	26–17	Oct 2016	France F22, Saint-Dizier	Futures	Hard (i)	Mick Lescure	Geoffrey Blancaneaux Evan Furness	6–2, 6–3
Loss	26–18	Oct 2016	Pune, India	Challenger	Hard	Luca Margaroli	Purav Raja Divij Sharan	6–3, 3–6, [9–11]
Loss	26–19	Jan 2017	France F1, Bagnoles-de-l'Orne	Futures	Clay (i)	Grégoire Jacq	Constant Lestienne Alexis Musialek	6–3, 5–7, [8–10]
Win	27–19	Jan 2017	France F2, Bressuire	Futures	Hard (i)	Corentin Denolly	Ante Pavić Ruan Roelofse	6–4, 6–2
Win	28–19	Mar 2017	Canada F1, Gatineau	Futures	Hard (i)	Miķelis Lībietis	Grégoire Barrère Laurent Lokoli	7–6(7–4), 6–3
Loss	28–20	Mar 2017	Canada F2, Sherbrooke	Futures	Hard (i)	Miķelis Lībietis	Isak Arvidsson Frederik Nielsen	0–6, 4–6
Loss	28–21	May 2017	France F10, Grasse	Futures	Clay	Grégoire Jacq	Maxime Chazal Louis Tessa	2–6, 6–1, [7–10]
Win	29–21	Aug 2017	Manerbio, Italy	Challenger	Clay	Romain Arneodo	Mikhail Elgin Roman Jebavý	4–6, 7–6(7–3), [10–5]
Loss	29–22	Sep 2017	Istanbul, Turkey	Challenger	Hard	Romain Arneodo	Andre Begemann Jonathan Eysseric	3–6, 7–5, [4–10]
Win	30–22	Jan 2018	Nouméa, New Caledonia	Challenger	Hard	Tim Pütz	Alejandro González Jaume Munar	6–2, 6–2
Win	31–22	Mar 2018	Lille, France	Challenger	Hard	Tim Pütz	Jeevan Nedunchezhiyan Purav Raja	7–6(7–3), 1–6, [10–7]
Loss	31–23	Sep 2018	Cary, USA	Challenger	Hard	Fabrice Martin	Evan King Hunter Reese	4–6, 6–7(6–8)
Loss	31–24	Nov 2018	Eckental, Germany	Challenger	Carpet (i)	Jonny O'Mara	Kevin Krawietz Andreas Mies	1–6, 4–6
Win	32–24	Jan 2019	Canberra, Australia	Challenger	Hard	Marcelo Demoliner	André Göransson Sem Verbeek	3–6, 6–4, [10–3]
Win	33–24	Feb 2019	Quimper, France	Challenger	Hard (i)	Fabrice Martin	David Pel Antonio Šančić	6–4, 6–2
Win	34–24	Mar 2019	Lille, France	Challenger	Hard	Romain Arneodo	Jonathan Erlich Fabrice Martin	7–5, 5–7, [10–8]
Loss	34–25	Apr 2019	Bordeaux, France	Challenger	Clay	Romain Arneodo	Quentin Halys Grégoire Barrère	4–6, 1–6
Loss	34–26	Jul 2019	Granby, Canada	Challenger	Hard	Li Zhe	André Göransson Sem Verbeek	2–6, 4–6
Win	35–26	Sep 2019	Orleans, France	Challenger	Hard (i)	Romain Arneodo	Hans Podlipnik Castillo Tristan-Samuel Weissborn	6–7(5–7), 6–3, [10–1]
Loss	35–27	Sep 2020	Cordenons, Italy	Challenger	Clay	Andrés Molteni	Ariel Behar Andrey Golubev	5–7, 4–6
Win	36–27	Sep 2020	Aix-en-Provence, France	Challenger	Clay	Andrés Molteni	Ariel Behar Gonzalo Escobar	6–4, 7–6(7–4)
Win	37–27	Feb 2021	Biella, Italy	Challenger	Hard (i)	Tim Pütz	Lloyd Glasspool Harri Heliövaara	7–6(7–4), 6–3
Loss	37–28	Apr 2021	Marbella, Spain	Challenger	Clay	Romain Arneodo	Dominic Inglot Matt Reid	6–1, 3–6, [6–10]
Win	38–28	Mar 2022	Roseto degli Abruzzi, Italy	Challenger	Clay	Jan Zieliński	Roman Jebavý Philipp Oswald	7–6(7–2), 4–6, [10–3]
Loss	38–29	Mar 2022	Marbella, Spain	Challenger	Clay	Jan Zieliński	Roman Jebavý Philipp Oswald	6–7(6–8), 6–3, [3–10]
Loss	38–30	May 2022	Bordeaux, France	Challenger	Clay	Jan Zieliński	Rafael Matos David Vega Hernández	4-6, 0-6
Loss	38–31	Aug 2022	Grodzisk Mazowiecki, Poland	Challenger	Hard	Fabien Reboul	Robin Haase Philipp Oswald	3–6, 4–6
Loss	38–32	Mar 2023	Phoenix, USA	Challenger	Hard	Jan Zieliński	Nathaniel Lammons Jackson Withrow	7–6(7–1), 4–6, [8–10]