Daniel Altmaier

2017: ATP debut

Altmaier made his ATP main draw debut as a qualifier at the 2017 Geneva Open, defeating Alexander Ward and Petr Michnev in qualifying. He lost to Sam Querrey in the first round.

He won his first ATP tour-level match as a lucky loser at the 2017 Antalya Open when he beat Víctor Estrella Burgos. In the next round, he defeated wildcard Marsel İlhan to reach the quarterfinals, where he lost to Yūichi Sugita. Both of his victories were decided by a third set tiebreak.^[5]

2020: Major debut and first top-10 win

Shoulder and hip injuries held back Altmaier's progress in his tennis career, but victories in qualifying over Tallon Griekspoor and Ruben Bemelmans led to his Grand Slam debut at the 2020 French Open, where he defeated Feliciano López, 30th seed Jan-Lennard Struff and 7th seed Matteo Berrettini, all of them in straight sets.^[6][7] In the fourth round, he lost to Pablo Carreño Busta.

2021: Two ATP semifinals, Top 100 debut

In October, Altmaier recorded his first win at a Masters 1000 level on his debut at the 2021 BNP Paribas Open defeating Sam Querrey.^[8]

Altmaier made his debut in the top 100 on 15 November 2021 at World No. 98 following the final at the 2021 Knoxville Challenger. He followed this by winning his third Challenger title for the year at the 2021 Puerto Vallarta Open.

2022: Top 60

He made his Grand Slam debut at the 2022 Australian Open and 2022 Wimbledon Championships.

At the 2022 US Open also on his debut, he took Jannik Sinner to five sets in his first round match.^[9]

2023: First Masters quarterfinal, top 50

In April, Altmaier claimed his seventh Challenger title at the 2023 Sarasota Open defeating defending champion Daniel Elahi Galán.^[10] He entered the 2023 Mutua Madrid Open as a lucky loser replacing 18th seed Pablo Carreño Busta directly into the second round, for only his second time at this round at a Masters 1000 level. He defeated compatriots Oscar Otte and Yannick Hanfmann to reach the fourth round for the first time in his career at the Masters level.^[11] He reached the quarterfinals for the first time defeating Jaume Munar in straight sets and moved 30 positions back up in the top 65 in the rankings.^[12][13] He lost to Borna Ćorić in straight sets.^[14][15] He continued his good form at the 2023 French Open where he reached again the third round, defeating eight seed Jannik Sinner in five sets in 5 hours and 26 minutes, the longest match since Lorenzo Giustino against Corentin Moutet six hours, 5 minutes win in 2020, the fifth longest overall of the tournament^[16] and the second longest of the season after Kokkinakis against Murray at the Australian Open.^[17][18]

He qualified for the 2023 Halle Open as a lucky loser but had to withdraw last minute due to hip injury.^[19][20]

At the 2023 US Open, he won his first main draw match at this Major defeating Constant Lestienne. As a result he reached the top 50 in the singles rankings on 11 September 2024. At the 2023 Paris Masters, he reached the third round after a walkover from Taylor Fritz who was injured.^[21]

Singles

Current through the 2026 Indian Wells Open.

Doubles

Singles: 12 (7 titles, 5 runner-ups)

More information Result, W–L ...

Result	W–L	Date	Tournament	Surface	Opponent	Score
Loss	0–1	Jan 2018	Burnie International, Australia	Hard	Stéphane Robert	1–6, 2–6
Win	1–1	Jul 2021	Sparkassen Open, Germany	Clay	Henri Laaksonen	6–1, 6–2
Win	2–1	Aug 2021	Platzmann-Sauerland Open, Germany	Clay	Nicolás Jarry	7–6(7–1), 4–6, 6–3
Loss	2–2	Nov 2021	Knoxville Challenger, United States	Hard (i)	Christopher Eubanks	3–6, 4–6
Win	3–2	Nov 2021	Puerto Vallarta Open, Mexico	Hard	Alejandro Tabilo	6–3, 3–6, 6–3
Loss	3–3	Mar 2022	Arizona Tennis Classic, United States	Hard	Denis Kudla	6–2, 2–6, 3–6
Win	4–3	May 2022	Heilbronner Neckarcup, Germany	Clay	Andrej Martin	3–6, 6–1, 6–4
Win	5–3	Oct 2022	Lima Challenger, Peru	Clay	Tomás Martín Etcheverry	6–1, 6–7(4–7), 6–4
Win	6–3	Nov 2022	Challenger Ciudad de Guayaquil, Ecuador	Clay	Federico Coria	6–2, 6–4
Win	7–3	Apr 2023	Sarasota Open, United States	Clay	Daniel Elahi Galán	7–6(7–1), 6–1
Loss	7–4	Jun 2024	Emilia-Romagna Open, Italy	Clay	Jesper de Jong	6–7(5–7), 1–6
Loss	7–5	Sep 2024	Copa Sevilla, Spain	Clay	Roberto Carballés Baena	3–6, 5–7

Close

Singles: 17 (9 titles, 8 runner-ups)

More information Result, W–L ...

Result	W–L	Date	Tournament	Surface	Opponent	Score
Loss	0–1	Sep 2015	F26 Santa Margherita di Pula, Italy	Clay	Lorenzo Sonego	5–7, 4–6
Win	1–1	Jun 2016	F2 Havré, Belgium	Clay	Maxime Authom	6–2, 6–2
Win	2–1	Jul 2016	F6 Knokke, Belgium	Clay	Casper Ruud	6–7(3–7), 6–1, 7–6(7–3)
Loss	2–2	Oct 2016	F33 Santa Margherita di Pula, Italy	Clay	Stefano Travaglia	4–6, 6–2, 1–6
Loss	2–3	Nov 2016	F3 Mishref, Kuwait	Hard	Marcus Willis	3–6, 6–7(8–10)
Win	3–3	Dec 2016	F4 Doha, Qatar	Hard	Jonny O'Mara	7–5, 6–3
Loss	3–4	Dec 2016	F5 Hua Hin, Thailand	Hard	Kwon Soon-woo	2–6, 2–6
Win	4–4	Feb 2017	F2 Bellevue, Switzerland	Carpet (i)	Tim Pütz	7–5, 7–6(7–5)
Win	5–4	Apr 2017	F1 Doha, Qatar	Hard	Antoine Escoffier	6–4, 6–3
Loss	5–5	Apr 2017	F2 Doha, Qatar	Hard	Antoine Escoffier	2–6, 7–6(7–2), 4–6
Loss	5–6	Oct 2017	F16 Hamburg, Germany	Hard (i)	Daniel Masur	3–6, 6–3, 3–6
Loss	5–7	Dec 2017	F4 Hong Kong China	Hard	Cheong-Eui Kim	3–6, 6–3, 5–7
Loss	5–8	Mar 2019	M15 Sharm El Sheikh, Egypt	Hard	Viktor Durasovic	7–6(7–5), 4–6, 4–6
Win	6–8	Jun 2019	M15 Kaltenkirchen, Germany	Clay	Christian Lindell	6–1, 6–3
Win	7–8	Nov 2019	M25 Malibu, United States	Hard	Alexander Sarkissian	6–2, 6–4
Win	8–8	Nov 2019	M15 East Lansing, United States	Hard (i)	Michael Geerts	4–6, 6–3, 6–0
Win	9–8	Dec 2019	M15 Santo Domingo, Dominican Republic	Hard	Jan Choinski	6–3, 4–6, 6–4

Close

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

More information Result, W–L ...

Result	W–L	Date	Tournament	Surface	Partner	Opponents	Score
Win	1–0	Feb 2015	ITF Colombo, Sri Lanka	Clay	Tom Schönenberg	José Checa Calvo Rui Machado	6–7(6–8), 6–3, [11–9]
Loss	1–1	May 2015	ITF Jablonec, Czech Republic	Clay	Paul Wörner	Mateusz Kowalczyk Adam Majchrowicz	3–6, 5–7
Win	2–1	Sep 2016	ITF Damme, Belgium	Clay	Marvin Netuschil	Oscar Otte Tom Schönenberg	6–2, 6–0
Win	3–1	Oct 2016	ITF Pula, Italy	Clay	Marvin Netuschil	Claudio Fortuna Omar Giacalone	6–2, 6–0
Win	4–1	Nov 2016	ITF Mishref, Kuwait	Hard	Fred Simonsson	Sanjar Fayziev Shonigmatjon Shofayziyev	7–6(7–3), 6–2
Loss	4–2	Nov 2016	ITF Mishref, Kuwait	Hard	Fred Simonsson	Jordi Muñoz Abreu David Pérez Sanz	4–6, 4–6
Win	5–2	Nov 2016	ITF Mishref, Kuwait	Hard	Marcus Willis	Roy de Valk Ronan Joncour	6–1, 6–1
Win	6–2	Feb 2017	ITF Bellevue, Switzerland	Carpet (i)	Marvin Netuschil	Maximilian Neuchrist David Pel	7–5, 1–6, [11–9]
Loss	6–3	Apr 2017	ITF Doha, Qatar	Hard	Lucas Miedler	Markus Eriksson Milos Sekulic	5–7, 6–3, [7–10]
Loss	6–4	Mar 2019	ITF Sharm El Sheikh, Egypt	Hard	Adrian Bodmer	Enrico Dalla Valle Francesco Forti	6–4, 1–6, [7–10]
Loss	6–5	Oct 2019	ITF Bad Salzdetfurth, Germany	Clay (i)	Jan Choinski	Lasse Muscheites Stefan Seifert	6–2, 3–6, [9–11]

Close