| ATP - Roma | 05/11 09:00 | 23 | [120] Giulio Zeppieri v Daniel Altmaier [65] | 6-7,6-4,0-6 | |
| ATP - Roma | 05/09 09:00 | 19 | [65] Daniel Altmaier v Elias Ymer [146] | 7-6,6-0 | |
| ATP - Roma | 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 - Munique | 04/20 08:30 | 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 | |
| ATP - Houston | 04/07 20:00 | 25 | [86] Max Purcell v Daniel Altmaier [108] | 6-4,3-6,6-3 | |
| ATP - Miami | 03/22 20:20 | 23 | [80] Ilya Ivashka v Daniel Altmaier [114] | 6-2,6-1 | |
| ATP - Miami | 03/21 15:00 | 19 | [114] Daniel Altmaier v Geoffrey Blancaneaux [169] | 6-2,6-2 | |
| ATP - Miami | 03/20 16:50 | 14 | [114] Daniel Altmaier v Martin Damm [426] | 7-5,7-6 | |
| Challenger - Puerto Vallarta | 03/10 23:00 | 27 | [98] Daniel Altmaier v Yuta Shimizu [309] | 6-3,4-6,3-6 | |
| Challenger - Puerto Vallarta | 03/10 01:30 | 26 | [98] Daniel Altmaier v Elmar Ejupovic [293] | 6-0,6-1 | |
| Challenger - Puerto Vallarta | 03/08 01:30 | 25 | [98] Daniel Altmaier v Dominik Koepfer [236] | 6-7,7-6,6-1 | |
| ATP - Acapulco | 03/01 01:10 | 25 | [95] Daniel Altmaier v Brandon Nakashima [49] | 3-6,6-3,1-6 | |
| Challenger - Monterrey | 02/24 20:00 | 27 | [103] Nuno Borges v Daniel Altmaier [95] | 7-6,6-4 | |
| Challenger - Monterrey | 02/22 20:00 | 26 | [159] Maximilian Marterer v Daniel Altmaier [95] | 6-7,3-6 | |
| Challenger - Monterrey | 02/20 22:00 | 25 | [198] Brandon Holt v Daniel Altmaier [95] | 6-7,3-6 | |
| ATP - Delray Beach | 02/14 16:00 | 25 | [97] Daniel Altmaier v Adrian Mannarino [59] | 6-4,3-6,4-6 | |
| ATP - Dallas | 02/09 22:30 | 26 | [39] John Isner v Daniel Altmaier [99] | 6-3,7-6 | |
| ATP - Dallas | 02/08 18:45 | 25 | [265] Zachary Svajda v Daniel Altmaier [99] | 2-6,4-6 | |
| Taça Davis | 02/04 17:35 | 45 | [91] Daniel Altmaier v Stanislas Wawrinka [135] | 3-6,7-5,4-6 |
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. 3.