| 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 | |
| Davis Cup | 02/04 17:35 | 45 | [91] Daniel Altmaier v Stanislas Wawrinka [135] | 3-6,7-5,4-6 | |
| Australian Open | 01/16 03:20 | 23 | [92] Daniel Altmaier v Frances Tiafoe [17] | 3-6,3-6,7-6,6-7 | |
| ATP Auckland | 01/07 01:45 | 14 | [71] Thiago Monteiro v Daniel Altmaier [94] | 3-6,7-5,7-6 | |
| Challenger Montevideo | 11/13 00:00 | 28 | [80] Daniel Altmaier v Tomas Martin Etcheverry [85] | 7-6,3-6,6-7 | |
| Challenger Montevideo | 11/11 23:45 | 27 | [209] Nicolas Kicker v Daniel Altmaier [80] | 4-6,6-1,3-6 | |
| Challenger Montevideo | 11/09 20:00 | 26 | [164] Felipe M R Alves v Daniel Altmaier [80] | 6-7,3-6 | |
| Challenger Montevideo | 11/08 21:05 | 25 | [235] Juan Bautista Torres v Daniel Altmaier [80] | 2-6,2-6 | |
| Challenger Guayaquil | 11/06 17:55 | 29 | [71] Federico Coria v Daniel Altmaier [91] | 2-6,4-6 | |
| Challenger Guayaquil | 11/05 21:20 | 28 | [91] Daniel Altmaier v Marco Cecchinato [109] | 7-6,6-4 | |
| Challenger Guayaquil | 11/04 18:00 | 27 | [249] Jesper De Jong v Daniel Altmaier [91] | 2-6,6-3,3-6 | |
| Challenger Guayaquil | 11/03 17:50 | 26 | [234] Juan Bautista Torres v Daniel Altmaier [91] | 4-6,3-6 | |
| Challenger Guayaquil | 11/02 18:30 | 25 | [348] Thiago Seyboth Wild v Daniel Altmaier [91] | 6-1,6-7,2-6 | |
| Challenger Lima | 10/30 18:00 | 29 | [106] Daniel Altmaier v Tomas Martin Etcheverry [89] | 6-1,6-7,6-4 | |
| Challenger Lima | 10/29 19:55 | 28 | [73] Federico Coria v Daniel Altmaier [106] | 3-6,3-6 | |
| Challenger Lima | 10/28 21:25 | 27 | [106] Daniel Altmaier v Santiago R Taverna [162] | 3-6,7-5,6-2 | |
| Challenger Lima | 10/27 18:00 | 26 | [106] Daniel Altmaier v Franco Agamenone [159] | 7-5,3-6,6-3 |
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.