| WTA Auckland | 12/30 03:10 | 45 | [215] Elysia Bolton v Jule Niemeier [165] | 3-6,4-6 | |
| Billie Jean King Cup | 11/10 09:00 | - | [61] Clara Burel v Jule Niemeier [162] | 6-4,6-3 | |
| ITF W60 - Bratislava | 11/02 10:00 | 27 | [175] Jule Niemeier v Lea Boskovic [243] | 1-6,7-6,2-6 | |
| ITF W60 - Bratislava | 11/01 09:05 | 26 | [175] Jule Niemeier v Ayla Aksu [439] | 6-1,7-5 | |
| ITF W60 - Bratislava | 10/31 09:00 | 25 | [175] Jule Niemeier v Martyna Kubka [443] | Retired | |
| ITF W60 - Glasgow | 10/25 14:20 | 25 | [175] Jule Niemeier v Valentina Ryser [370] | 3-6,1-6 | |
| WTA Guangzhou | 09/18 09:45 | 25 | [155] Harriet Dart v Jule Niemeier [136] | 6-3,6-2 | |
| WTA Osaka | 09/12 04:40 | 25 | [136] Jule Niemeier v Anna Kalinskaya [92] | 4-6,4-6 | |
| ITF W100 - Tokyo | 09/07 05:10 | 27 | [111] Kimberly Birrell v Jule Niemeier [91] | 6-4,6-3 | |
| ITF W100 - Tokyo | 09/06 02:00 | 26 | [189] Ankita Raina v Jule Niemeier [91] | 2-6,7-5,6-7 | |
| ITF W100 - Tokyo | 09/04 03:45 | 25 | [173] Moyuka Uchijima v Jule Niemeier [91] | 2-6,4-6 | |
| US Open - Damer | 08/23 20:20 | 14 | [89] Jule Niemeier v Despina Papamichail [193] | 3-6,4-6 | |
| WTA Kozerki | 08/08 14:00 | 25 | [94] Jule Niemeier v Maja Chwalinska [420] | 6-4,2-6,3-6 | |
| WTA Prag | 08/02 09:00 | 26 | [101] Jule Niemeier v Kateryna Baindl [98] | Retired | |
| WTA Prag | 08/01 13:55 | 25 | [134] Heather Watson v Jule Niemeier [101] | 2-6,3-6 | |
| WTA Hamburg | 07/27 09:00 | 27 | [106] Jule Niemeier v Daria Saville [225] | 3-6,2-6 | |
| 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 - Damer | 07/07 10:00 | 24 | [103] Jule Niemeier v Dalma Galfi [126] | 6-4,6-7,1-6 | |
| Wimbledon - Damer | 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 | |
| Franska öppna - Damer | 05/28 19:20 | 23 | [76] Jule Niemeier v Daria Kasatkina [9] | 3-6,4-6 | |
| WTA Florence | 05/17 11:30 | 25 | [74] Jule Niemeier v Matilde Paoletti [294] | 3-6,6-3,3-6 | |
| WTA Rom | 05/09 09:00 | 23 | [74] Jule Niemeier v Nuria Parrizas-Diaz [80] | 6-4,4-6,2-6 | |
| WTA Madrid | 04/29 09:00 | 25 | [29] Elise Mertens v Jule Niemeier [67] | 6-3,6-4 | |
| WTA Madrid | 04/27 09:00 | 24 | [67] Jule Niemeier v Petra Kvitova [10] | 7-6,6-1 |