| WTA Karlsruhe | 05/11 15:30 | 25 | [258] Mandy Minella v Jule Niemeier [94] | 4-6,3-6 | |
| WTA Karlsruhe | 05/11 09:00 | 25 | Kathinka Von Deichmann v Jule Niemeier | Cancelled | |
| ITF W100 Wiesbaden | 05/07 15:05 | 28 | [228] Nastasja Schunk v Jule Niemeier [110] | 7-5,7-5 | |
| ITF W100 Wiesbaden | 05/06 15:00 | 27 | [110] Jule Niemeier v Rebecca Peterson [76] | 6-4,6-2 | |
| ITF W100 Wiesbaden | 05/05 15:00 | 26 | [110] Jule Niemeier v Polona Hercog [164] | 6-2,6-2 | |
| ITF W100 Wiesbaden | 05/04 13:00 | 25 | [110] Jule Niemeier v Ekaterina Vl. Makarova [341] | 6-2,6-2 | |
| ITF W60 Zagreb | 04/30 12:10 | 29 | [139] Reka-Luca Jani v Jule Niemeier [110] | 2-6,2-6 | |
| ITF W60 Zagreb | 04/29 08:00 | 28 | [388] Petra Marcinko v Jule Niemeier [110] | 6-7,1-6 | |
| ITF W60 Zagreb | 04/28 08:00 | 27 | [270] Iryna Shymanovich v Jule Niemeier [110] | 4-6,6-7 | |
| ITF W60 Zagreb | 04/27 10:50 | 26 | [283] Eva Lys v Jule Niemeier [110] | Retired | |
| ITF W60 Zagreb | 04/26 12:25 | 25 | [498] Ziva Falkner v Jule Niemeier [110] | 2-6,4-6 | |
| WTA Stuttgart | 04/19 18:10 | 25 | [108] Jule Niemeier v Bianca Andreescu [121] | 6-7,3-6 | |
| WTA Miami | 03/21 14:00 | 14 | [156] Storm Sanders v Jule Niemeier [111] | 6-1,5-7,6-4 | |
| WTA Indian Wells | 03/07 23:30 | 14 | [168] Christina McHale v Jule Niemeier [109] | 3-6,7-5,6-4 | |
| WTA Monterrey | 02/28 22:20 | 25 | [120] Heather Watson v Jule Niemeier [110] | 6-3,2-6,7-6 | |
| WTA Monterrey | 02/27 17:00 | 19 | [265] Catherine Harrison v Jule Niemeier [114] | 3-6,3-6 | |
| WTA Monterrey | 02/26 21:40 | 14 | Bianca J Fernandez v Jule Niemeier | 3-6,2-6 | |
| ITF W60 Altenkirchen | 02/15 17:50 | 25 | [115] Jule Niemeier v Urszula Radwanska [244] | 2-6,6-7 | |
| WTA St. Petersburg | 02/08 08:00 | 25 | [118] Jule Niemeier v Petra Kvitova [23] | 2-6,1-6 | |
| WTA St. Petersburg | 02/07 08:00 | - | [118] Jule Niemeier v Erika Andreeva [304] | 4-6,6-1,6-1 | |
| WTA St. Petersburg | 02/06 08:00 | 19 | [120] Jule Niemeier v Natalia Vikhlyantseva [243] | 6-2,6-1 | |
| WTA St. Petersburg | 02/05 11:15 | 45 | [84] Anna Bondar v Jule Niemeier [120] | 4-6,3-6 | |
| Australian Open Women | 01/14 06:20 | 19 | [191] Arianne Hartono v Jule Niemeier [130] | 6-1,1-6,6-3 | |
| Australian Open Women | 01/13 03:35 | 15 | [227] Simona Waltert v Jule Niemeier [130] | 1-6,1-6 | |
| Australian Open Women | 01/11 05:35 | 14 | Yuriko Lily Miyazaki v Jule Niemeier | 5-7,1-6 | |
| Australian Open Women | 01/11 03:30 | - | Yumi Miyazaki v Jule Niemeier | 5-7,1-6 | |
| WTA Melbourne 1 | 01/03 02:00 | 14 | [133] Jule Niemeier v Qinwen Zheng [126] | 4-6,0-6 | |
| WTA Nur-Sultan | 09/28 10:00 | 25 | [408] Vera Lapko v Jule Niemeier [132] | 7-5,4-6,6-4 | |
| WTA Luxembourg | 09/14 19:40 | 25 | [30] Jelena Ostapenko v Jule Niemeier [133] | 6-2,6-2 | |
| WTA Luxembourg | 09/12 11:40 | 19 | [146] Jule Niemeier v Tereza Smitkova [336] | 6-7,6-3,6-4 |