2017: ATP and Grand Slam debut at Wimbledon & third round

Ofner made his ATP main draw debut at the 2017 Wimbledon Championships after going through qualifying, defeating Kimmer Coppejans, Miljan Zekić and Jay Clarke. In the first round, he beat Thomaz Bellucci in straight sets. In the next round, he upset world No. 18 Jack Sock in a five-setter.^[1][7]

In August, Ofner caused another surprise in front of his home crowd at the 2017 Generali Open Kitzbühel by defeating first seed Pablo Cuevas as a wildcard in the second round.^[8] He then won over Renzo Olivo to reach the semifinals where he fell to João Sousa.

2018–2022: Maiden Challenger title, French Open debut

Ofner won his maiden ATP Challenger title at the 2018 President's Cup in Astana.

At the 2022 French Open he qualified to make his Grand Slam main draw debut at this Major.^[9] He lost to World No. 3 Alexander Zverev in the first round.^[10]

2023: Major fourth round, Austrian No. 1, top 50, Masters debut and first win

In the first three months of the season Ofner reached three Challenger Tour finals in Tenerife,^[11][2] Antalya^[12] and in Zadar.^[13][14]

He qualified for his first ATP tournament for the season in Estoril where he lost in the first round to Dominic Thiem.

Ranked No. 118, he qualified for the main draw of the 2023 French Open for a second consecutive year and defeated Maxime Cressy for his first win at this Major. Next he defeated 24th seed Sebastian Korda to reach the third round for a second time at a Major.^[15][16] He went one step further and defeated Fabio Fognini to reach the fourth round of a Major for the first time in his career. He lost to Stefanos Tsitsipas in straight sets. As a result he made his top 100 debut at world No. 81 and became the Austrian No. 1 player on 12 June 2023.^[17] He further reached the top 70 following a Challenger final showing at the 2023 Ilkley Trophy where he lost to Jason Kubler. As a result of his run he received a wildcard for the 2023 Wimbledon Championships, where he had made the third round previously in 2017.^[18] He reached a new career-high ranking of No. 52 on 24 July 2023. He also made the second round at the last Major, the US Open.

At the 2023 Astana Open, he reached the semifinals defeating third seed Alexander Bublik and this time compatriot Dominic Thiem. As a result he moved into the top 50 in the rankings on 2 October 2023. He lost to sixth seed and eventual champion Adrian Mannarino.^[19]

Ofner made his Masters debut at the 2023 Rolex Shanghai Masters where he reached the second round for his first win over Juan Pablo Varillas. He received a wildcard for the 2023 Erste Bank Open.^[20]

He finished the year ranked No. 43 in the world.^[21]

2024: Top 40 debut

Ofner reached the semifinals in Hong Kong defeating Mackenzie McDonald, fifth seed Jan-Lennard Struff and Roberto Bautista Agut. He lost to Emil Ruusuvuori in three sets.^[22] As a result, he reached the top 40 on 8 January 2024.^[23]

Singles: 23 (9–14)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Aug 2015	Austria F8, Vogau	Futures	Clay	Dmitry Popko	0–6, 2–6
Loss	0–2	Apr 2016	Turkey F14, Antalya	Futures	Hard	Marc Sieber	7–5, 5–7, 3–6
Win	1–2	Jul 2016	Austria F3, Bad Waltersdorf	Futures	Clay	Corentin Denolly	6–4, 4–6, 6–3
Win	2–2	Aug 2016	Austria F5, Innsbruck	Futures	Clay	Gonçalo Oliveira	6–2, 6–3
Win	3–2	Sep 2016	Austria F5, St. Pölten	Futures	Clay	Riccardo Bellotti	7–5, 6–4
Loss	3–3	Nov 2016	Greece F10, Heraklion	Futures	Hard	Václav Šafránek	6–4, 3–6, 5–7
Win	4–3	Nov 2016	Greece F11, Heraklion	Futures	Hard	Dominik Kellovský	7–6(8–6), 6–4
Loss	4–4	Dec 2016	Qatar F5, Doha	Futures	Hard	Ramkumar Ramanathan	5–7, 3–6
Loss	4–5	Dec 2016	Qatar F6, Doha	Futures	Hard	Ramkumar Ramanathan	5–7, 3–6
Win	5–5	Feb 2017	Turkey F5, Antalya	Futures	Hard	Michal Konečný	3–6, 6–1, 6–2
Loss	5–6	May 2017	Mestre, Italy	Challenger	Clay	João Domingues	6–7(4–7), 4–6
Win	6–6	Jul 2018	Astana, Kazakhstan	Challenger	Hard	Daniel Brands	7–6(7–5), 6–3
Win	7–6	May 2019	Puerto Vallarta, Mexico	Challenger	Hard	John-Patrick Smith	7–6(10–8), 3–6, 6–3
Loss	7–7	Nov 2019	Ortisei, Italy	Challenger	Hard (i)	Jannik Sinner	2–6, 4–6
Loss	7–8	Nov 2020	Hamburg, Germany	Challenger	Hard (i)	Taro Daniel	1–6, 2–6
Loss	7–9	Mar 2021	Nur-Sultan, Kazakhstan	Challenger	Clay	Tomáš Macháč	6–4, 4–6, 4–6
Win	8–9	Apr 2022	Prague, Czech Republic	Challenger	Clay	Dalibor Svrčina	6–0, 6-4
Loss	8–10	Jan 2023	Tenerife, Spain	Challenger	Hard	Alexander Shevchenko	5–7, 2–6
Loss	8–11	Mar 2023	Antalya, Turkey	Challenger	Clay	Fábián Marozsán	5–7, 0–6
Loss	8–12	Mar 2023	Zadar, Croatia	Challenger	Clay	Alessandro Giannessi	4–6, 7–5, 6–7(6–8)
Loss	8–13	May 2023	Prague, Czech Republic	Challenger	Clay	Dominic Stricker	6–7(7–9), 3–6
Loss	8–14	Jun 2023	Ilkley, United Kingdom	Challenger	Grass	Jason Kubler	4–6, 4–6
Win	9–14	Jul 2023	Salzburg, Austria	Challenger	Clay	Lukas Neumayer	6–3, 6–2

Doubles: 10 (3–7)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jul 2013	Austria F5, Bad Waltersdorf	Futures	Clay	Patrick Ofner	Philip Lang Richard Ruckelshausen	6–7(5–7), 3–6
Loss	0–2	Jul 2015	Austria F5, Bad Waltersdorf	Futures	Clay	Philip Lang	Tom Kočevar-Dešman Lucas Miedler	2–6, 2–6
Loss	0–3	Jul 2016	Austria F3, Bad Waltersdorf	Futures	Clay	Sebastian Bader	Bernd Kossler Gregor Ramskogler	4–6, 6–2, [4–10]
Loss	0–4	Aug 2016	Austria F6, Vogau	Futures	Clay	Lenny Hampel	Hugo Dellien Federico Zeballos	5–7, 4–6
Win	1–4	Nov 2016	Greece F11, Heraklion	Futures	Hard	Lenny Hampel	Domagoj Bilješko Antun Vidak	7–5, 6–2
Loss	1–5	Dec 2016	Qatar F4, Doha	Futures	Hard	Lenny Hampel	James Marsalek Jonny O'Mara	4–6, 4–6
Win	2–5	Feb 2017	Turkey F4, Antalya	Futures	Hard	Alexander Erler	Volodymyr Uzhylovskyi Anton Zaitcev	6–2, 3–6, [10–7]
Loss	2–6	Jun 2018	Shymkent, Kazakhstan	Challenger	Clay	Lucas Miedler	Lorenzo Giustino Gonçalo Oliveira	2–6, 6–7(4–7)
Win	3–6	Apr 2019	León, Mexico	Challenger	Hard	Lucas Miedler	Matt Reid John-Patrick Smith	4–6, 6–4, [10–6]
Loss	3–7	Feb 2023	Chennai, India	Challenger	Hard	Nino Serdarušić	Jay Clarke Arjun Kadhe	0–6, 4–6