| ATP Gstaad | 07/19 14:10 | 26 | [46] Yannick Hanfmann v Daniel Altmaier [64] | 4-6,6-2,7-5 | |
| ATP Gstaad | 07/17 08:30 | 25 | [107] Benjamin Bonzi v Daniel Altmaier [64] | 3-6,4-6 | |
| Challenger Braunschweig | 07/13 16:35 | 27 | [66] Daniel Altmaier v Franco Agamenone [175] | 3-6,6-2,3-6 | |
| Challenger Braunschweig | 07/12 11:55 | 26 | [66] Daniel Altmaier v Francesco Passaro [148] | 6-2,6-0 | |
| Challenger Braunschweig | 07/11 14:30 | 25 | [66] Daniel Altmaier v Carlos Taberner [355] | 6-3,6-3 | |
| Challenger Braunschweig | 07/11 08:00 | 25 | Daniel Altmaier v Giulio Zeppieri | Cancelled | |
| Wimbledon | 07/03 16:55 | 23 | [87] Aleksandar Vukic v Daniel Altmaier [66] | 6-3,7-6,3-6,7-5 | |
| ATP Halle | 06/20 10:00 | 25 | Daniel Altmaier v Roberto Bautista Agut | Cancelled | |
| ATP Halle | 06/18 09:00 | 19 | [59] Daniel Altmaier v Christopher Eubanks [75] | Retired | |
| ATP Halle | 06/17 09:00 | 45 | [59] Daniel Altmaier v Borna Gojo [111] | 7-6,6-3 | |
| ATP Stuttgart | 06/13 10:30 | 25 | [74] Christopher O'Connell v Daniel Altmaier [59] | 6-3,6-1 | |
| French Open | 06/03 17:40 | 25 | [79] Daniel Altmaier v Grigor Dimitrov [29] | 4-6,3-6,1-6 | |
| French Open | 06/01 10:40 | 24 | [9] Jannik Sinner v Daniel Altmaier [79] | 7-6,6-7,6-1,6-7,5-7 | |
| French Open | 05/29 15:30 | 23 | [79] Daniel Altmaier v Marc-Andrea Huesler [84] | 6-3,6-4,6-4 | |
| ATP Rome | 05/13 16:10 | 24 | [65] Daniel Altmaier v Frances Tiafoe [12] | 6-3,5-7,3-6 | |
| ATP Rome | 05/11 09:00 | 23 | [120] Giulio Zeppieri v Daniel Altmaier [65] | 6-7,6-4,0-6 | |
| ATP Rome | 05/09 09:00 | 19 | [65] Daniel Altmaier v Elias Ymer [146] | 7-6,6-0 | |
| ATP Rome | 05/08 10:15 | 14 | [92] Daniel Altmaier v Jozef Kovalik [147] | 6-2,6-4 | |
| ATP Madrid | 05/03 19:25 | 27 | [92] Daniel Altmaier v Borna Coric [20] | 3-6,3-6 | |
| ATP Madrid | 05/02 09:00 | 26 | [88] Jaume Munar v Daniel Altmaier [92] | 3-6,0-6 | |
| ATP Madrid | 04/30 19:00 | 25 | [92] Daniel Altmaier v Yannick Hanfmann [108] | 7-6,6-3 | |
| ATP Madrid | 04/28 09:00 | 24 | [92] Daniel Altmaier v Oscar Otte [98] | 6-4,7-5 | |
| ATP Madrid | 04/25 11:55 | 19 | [92] Daniel Altmaier v Jurij Rodionov [119] | 4-6,3-6 | |
| ATP Madrid | 04/24 13:20 | 14 | Daniel Altmaier v Attila Balazs | 6-1,6-1 | |
| ATP Munich | 04/19 09:00 | 25 | [129] Aslan Karatsev v Daniel Altmaier [93] | 4-6,7-6,6-2 | |
| Challenger Sarasota | 04/16 16:00 | 29 | [92] Daniel Elahi Galan v Daniel Altmaier [113] | 6-7,1-6 | |
| Challenger Sarasota | 04/15 20:00 | 28 | [113] Daniel Altmaier v Enzo Couacaud [183] | 6-2,6-2 | |
| Challenger Sarasota | 04/14 18:10 | 27 | [113] Daniel Altmaier v Gabriel Diallo [178] | Retired | |
| Challenger Sarasota | 04/13 17:00 | 26 | [113] Daniel Altmaier v Zizou Bergs [165] | 7-5,6-4 | |
| Challenger Sarasota | 04/12 18:00 | 25 | [113] Daniel Altmaier v Martin Damm [438] | 6-7,6-3,7-5 |
Wikipedia - Daniel Altmaier
Daniel Altmaier (German pronunciation: [ˈdaːni̯eːl ˈaltmaɪ̯ɐ]; born 12 September 1998) is a German professional tennis player. He has a career high ATP singles ranking of world No. 47, achieved on 2 October 2023. He is the current German No. 4.