Daniel Altmaier (; born 12 September 1998) is a German professional tennis player. He has a career-high ATP singles ranking of world No. 44 achieved on 5 January 2026 and a doubles ranking of No. 197 achieved on 27 July 2026. As of June 2026, he is the No. 4 German singles player.
Personal life Altmaier's father Jurij is Ukrainian and his mother Galina is Russian. He speaks German, English, Russian, and Spanish, the last he claims he learned through his Mexican girlfriend.
Career 2017: ATP Tour 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.
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. In the fourth round, he lost to Pablo Carreño Busta.
2021: Two ATP Tour 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.
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 major 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.
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. 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. 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. He lost to Borna Ćorić in straight sets. 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 and the second longest of the season after Kokkinakis against Murray at the Australian Open.
He qualified for the 2023 Halle Open as a lucky loser but had to withdraw last minute due to hip injury.
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.
2026
Performance timelines
Singles Current through the 2026 Davis Cup Qualifiers second round.
Tournament2017201820192020202120222023202420252026SRW–LWin %Grand Slam tournamentsAustralian OpenAAAAA1R1R1R2R1R0 / 51–517%French OpenAAA4RA1R3R2R4R1R0 / 69–660%WimbledonAAANHQ21R1R2R1R1R0 / 51–517%US OpenAAAAA1R2R1R3R1R0 / 53–5Win–loss0–00–00–03–10–00–43–42–46–40–40 / 2114–21National representationDavis CupAAAAAAG1SFAQ20 / 02–340%ATP 1000 tournamentsIndian Wells OpenAAANH2R1RA1RQ11R0 / 41–420%Miami OpenAAANHQ11R1R2R1R1R0 / 51–517%Monte-Carlo MastersAAANHAAA1R3R1R0 / 32–340%Madrid OpenAAANHAAQF3R1R1R0 / 45–456%Italian OpenAAAAAA2R1R1R2R0 / 42–433%Canadian OpenAAANHAQ2AQ11R2R0 / 21–233%Cincinnati OpenAAAAAQ11RQ11R2R0 / 31–325%Shanghai MastersAAANH1RA2R0 / 21–233%Paris MastersAAAAAA3RA3R0 / 23–260%Win–loss0–00–00–00–01–10–25–63–55–83–70 / 2917–29Career statistics2017201820192020202120222023202420252026CareerTournaments301382122222825Career total: 133Hard win–loss0–00–00–00–21–12–113–138–1115–183–110 / 6432–67Clay win–loss0–20–00–13–16–61–611–84–116–78–110 / 5339–53Grass win–loss2–10–00–00–00–12–40–21–11–34–40 / 1610–16Overall win–loss2–30–00–13–37–85–2114–2313–2322–2815–260 / 13381–136Year-end ranking2753702791308494568946
Doubles Current through the 2026 Halle Open. Tournament2017201820192020202120222023202420252026SRW–LGrand Slam tournamentsAustralian OpenAAAAA2R1R2RAA0 / 32–3French OpenAAAAA1RAAAA0 / 10–1WimbledonAAANHA1R1RAAA0 / 20–2US OpenAAAAA1RAAA0 / 10–1Win–loss0–00–00–00–00–01–40–21–10–00–00 / 72–7Career statisticsTournaments1021211331226Titles00000000000Finals00000000011Overall win–loss0–10–00–20–11–22–111–21–30–14–29–25Year-end ranking697–627596406329880568–
ATP Tour finals
Doubles: 1 (runner-up) LegendGrand Slam (–)ATP 1000 (–)ATP 500 (0–1)ATP 250 (–)Finals by surfaceHard (–)Clay (–)Grass (0–1)Finals by settingOutdoor (0–1)Indoor (–)
ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss0–1Halle Open, GermanyATP 500Grass João Fonseca Théo Arribagé Albano Olivetti6–7(2–7), 4–6
ATP Challenger Tour finals
Singles: 13 (7 titles, 6 runner-ups) Finals by surfaceHard (1–3)Clay (6–2)
ResultW–LDateTournamentSurfaceOpponentScoreLoss0–1Burnie International, AustraliaHard Stéphane Robert1–6, 2–6Win1–1Sparkassen Open, GermanyClay Henri Laaksonen6–1, 6–2Win2–1Platzmann-Sauerland Open, GermanyClay Nicolás Jarry7–6(7–1), 4–6, 6–3Loss2–2Knoxville Challenger, USHard (i) Christopher Eubanks3–6, 4–6Win3–2Puerto Vallarta Open, MexicoHard Alejandro Tabilo6–3, 3–6, 6–3Loss3–3Arizona Tennis Classic, USHard Denis Kudla6–2, 2–6, 3–6Win4–3Heilbronner Neckarcup, GermanyClay Andrej Martin3–6, 6–1, 6–4Win5–3Lima Challenger, PeruClay Tomás Martín Etcheverry6–1, 6–7(4–7), 6–4Win6–3Challenger Ciudad de Guayaquil, EcuadorClay Federico Coria6–2, 6–4Win7–3Sarasota Open, USClay Daniel Elahi Galán7–6(7–1), 6–1Loss7–4Emilia-Romagna Open, ItalyClay Jesper de Jong6–7(5–7), 1–6Loss7–5Copa Sevilla, SpainClay Roberto Carballés Baena3–6, 5–7Loss7–6Napoli Tennis Cup, ItalyClay Hamad Medjedovic2–6, 4–6
ITF Tour finals
Singles: 17 (9 titles, 8 runner-ups) Finals by surfaceHard (5–6)Clay (3–2)Carpet (1–0)
ResultW–LDateTournamentSurfaceOpponentScoreLoss0–1F26 Santa Margherita di Pula, ItalyClay Lorenzo Sonego5–7, 4–6Win1–1F2 Havré, BelgiumClay Maxime Authom6–2, 6–2Win2–1F6 Knokke, Belgium Clay Casper Ruud6–7(3–7), 6–1, 7–6(7–3)Loss2–2F33 Santa Margherita di Pula, ItalyClay Stefano Travaglia4–6, 6–2, 1–6Loss2–3F3 Mishref, KuwaitHard Marcus Willis3–6, 6–7(8–10)Win3–3F4 Doha, QatarHard Jonny O'Mara7–5, 6–3Loss3–4F5 Hua Hin, ThailandHard Kwon Soon-woo2–6, 2–6Win4–4F2 Bellevue, SwitzerlandCarpet (i) Tim Pütz7–5, 7–6(7–5)Win5–4F1 Doha, QatarHard Antoine Escoffier6–4, 6–3Loss5–5F2 Doha, QatarHard Antoine Escoffier2–6, 7–6(7–2), 4–6Loss5–6F16 Hamburg, GermanyHard (i) Daniel Masur3–6, 6–3, 3–6Loss5–7F4 Hong Kong (China SAR)Hard Cheong-Eui Kim3–6, 6–3, 5–7Loss5–8M15 Sharm El Sheikh, EgyptHard Viktor Durasovic7–6(7–5), 4–6, 4–6Win6–8M15 Kaltenkirchen, GermanyClay Christian Lindell6–1, 6–3Win7–8M25 Malibu, USHard Alexander Sarkissian6–2, 6–4Win8–8M15 East Lansing, USHard (i) Michael Geerts4–6, 6–3, 6–0Win9–8M15 Santo Domingo, Dominican RepublicHard Jan Choinski6–3, 4–6, 6–4
Doubles: 11 (6 titles, 5 runner-ups) Finals by surfaceHard (3–3)Clay (2–2)Carpet (1–0)
ResultW–LDateTournamentSurfacePartnerOpponentsScoreWin1–0ITF Colombo, Sri LankaClay Tom Schönenberg José Checa Calvo Rui Machado6–7(6–8), 6–3, [11–9]Loss1–1ITF Jablonec, Czech RepublicClay Paul Wörner Mateusz Kowalczyk Adam Majchrowicz3–6, 5–7Win2–1ITF Damme, BelgiumClay Marvin Netuschil Oscar Otte Tom Schönenberg6–2, 6–0Win3–1ITF Pula, ItalyClay Marvin Netuschil Claudio Fortuna Omar Giacalone6–2, 6–0Win4–1ITF Mishref, KuwaitHard Fred Simonsson Sanjar Fayziev Shonigmatjon Shofayziyev7–6(7–3), 6–2Loss4–2ITF Mishref, KuwaitHard Fred Simonsson Jordi Muñoz Abreu David Pérez Sanz4–6, 4–6Win5–2ITF Mishref, KuwaitHard Marcus Willis Roy de Valk Ronan Joncour 6–1, 6–1Win6–2ITF Bellevue, SwitzerlandCarpet (i) Marvin Netuschil Maximilian Neuchrist David Pel7–5, 1–6, [11–9]Loss6–3ITF Doha, QatarHard Lucas Miedler Markus Eriksson Milos Sekulic5–7, 6–3, [7–10]Loss6–4ITF Sharm El Sheikh, EgyptHard Adrian Bodmer Enrico Dalla Valle Francesco Forti6–4, 1–6, [7–10]Loss6–5ITF Bad Salzdetfurth, GermanyClay (i) Jan Choinski Lasse Muscheites Stefan Seifert6–2, 3–6, [9–11]
Wins over top 10 players Altmaier has a 8–13 record against players who were, at the time the match was played, ranked in the top 10.
Season2020202120222023202420252026Total Wins 1 0 0 2 1 2 2 8 #OpponentEventSurfaceRdScore20201. Matteo Berrettini 8French Open, FranceClay3R6–2, 7–6(7–5), 6–418620232. Jannik Sinner 9French Open, FranceClay2R6–7(0–7), 7–6(9–7), 1–6, 7–6(7–4), 7–5793. Andrey Rublev 7Hamburg Open, GermanyClay2R6–2, 6–26120244. Alexander Zverev 6Mexican Open, MexicoHard1R6–3, 3–6, 6–35720255. Taylor Fritz 4French Open, FranceClay1R7–5, 3–6, 6–3, 6–1666. Casper Ruud 9Paris Masters, FranceHard (i)2R6–3, 7–55020267. Ben Shelton 6Hamburg Open, GermanyClay2R4–6, 7–6(7–4), 6–4658. Daniil Medvedev 7Halle Open, GermanyGrassQF6–4, 6–7(6–8), 6–481
References
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