| WTA Hamburg | 07/26 09:00 | 26 | [58] Yulia Putintseva v Jule Niemeier [106] | 7-5,3-6,1-6 | |
| WTA Hamburg | 07/24 13:40 | 25 | [309] Ella Seidel v Jule Niemeier [106] | 6-7,6-1,3-6 | |
| Wimbledon - Kobiety | 07/07 10:00 | 24 | [103] Jule Niemeier v Dalma Galfi [126] | 6-4,6-7,1-6 | |
| Wimbledon - Kobiety | 07/06 10:00 | 23 | [16] Karolina Muchova v Jule Niemeier [103] | 4-6,7-5,1-6 | |
| WTA Berlin | 06/22 10:30 | 26 | [53] Marketa Vondrousova v Jule Niemeier [120] | Retired | |
| WTA Berlin | 06/20 15:00 | 25 | [120] Jule Niemeier v Ons Jabeur [6] | 7-6,6-4 | |
| WTA Berlin | 06/18 13:00 | 19 | [118] Jule Niemeier v Greet Minnen [120] | 7-6,3-6,6-2 | |
| WTA Berlin | 06/17 10:15 | 45 | [118] Jule Niemeier v Noma Noha Akugue [215] | 4-6,6-2,6-3 | |
| WTA Nottingham | 06/12 13:45 | 25 | [118] Jule Niemeier v Heather Watson [195] | 4-6,3-6 | |
| French Open - Kobiety | 05/28 19:20 | 23 | [76] Jule Niemeier v Daria Kasatkina [9] | 3-6,4-6 | |
| WTA Florencja | 05/17 11:30 | 25 | [74] Jule Niemeier v Matilde Paoletti [294] | 3-6,6-3,3-6 | |
| WTA Rzym | 05/09 09:00 | 23 | [74] Jule Niemeier v Nuria Parrizas-Diaz [80] | 6-4,4-6,2-6 | |
| WTA Madryt | 04/29 09:00 | 25 | [29] Elise Mertens v Jule Niemeier [67] | 6-3,6-4 | |
| WTA Madryt | 04/27 09:00 | 24 | [67] Jule Niemeier v Petra Kvitova [10] | 7-6,6-1 | |
| WTA Madryt | 04/25 08:00 | 23 | [67] Jule Niemeier v Xinyu Wang [60] | 6-4,6-2 | |
| WTA Stuttgart | 04/19 15:00 | 25 | [65] Jule Niemeier v Elena Rybakina [7] | 5-7,3-6 | |
| Puchar Billie Jean King | 04/15 11:55 | - | [65] Jule Niemeier v Beatriz Haddad Maia [14] | 7-6,3-6,6-2 | |
| WTA Charleston | 04/04 16:35 | 24 | [71] Caty McNally v Jule Niemeier [65] | 6-4,6-1 | |
| WTA Miami | 03/22 22:20 | 23 | [63] Anna Blinkova v Jule Niemeier [67] | 6-4,6-1 | |
| WTA Indian Wells | 03/09 19:00 | 23 | [45] Katerina Siniakova v Jule Niemeier [72] | 7-5,6-4 | |
| WTA Monterrey | 02/27 18:00 | 25 | [206] Caroline Dolehide v Jule Niemeier [69] | 6-1,6-0 | |
| WTA Merida | 02/21 21:15 | 25 | [69] Jule Niemeier v Panna Udvardy [91] | 6-7,6-7 | |
| WTA Linz | 02/08 19:25 | 26 | [44] Anastasia Potapova v Jule Niemeier [71] | 7-5,3-6,6-3 | |
| WTA Linz | 02/06 18:50 | 25 | [71] Jule Niemeier v Sofia Kenin [209] | 2-6,6-3,6-4 | |
| WTA Lyon | 02/01 17:30 | 26 | [73] Camila Osorio v Jule Niemeier [71] | 7-6,7-5 | |
| WTA Lyon | 01/30 19:00 | 25 | [141] Olga Danilovic v Jule Niemeier [71] | 5-7,6-2,3-6 | |
| Australian Open - Kobiety | 01/16 08:00 | 23 | [1] Iga Świątek v Jule Niemeier [69] | 6-4,7-5 | |
| WTA Adelaide 2 | 01/07 07:45 | 14 | [31] Karolina Pliskova v Jule Niemeier [65] | 6-4,6-3 | |
| United Cup - Kobiety | 01/02 02:20 | - | [11] Madison Keys v Jule Niemeier [65] | 6-2,6-3 | |
| United Cup - Kobiety | 12/31 00:50 | - | [65] Jule Niemeier v Marie Bouzkova [24] | 2-6,5-7 |