| US Open Women | 09/01 16:30 | 24 | [38] Yulia Putintseva v Jule Niemeier [108] | 4-6,3-6 | |
| US Open Women | 08/30 23:00 | 23 | [327] Sofia Kenin v Jule Niemeier [108] | 6-7,4-6 | |
| ITF W60 Bronx | 08/17 14:00 | 25 | [100] Jule Niemeier v Lesley Pattinama Kerkhove [199] | 6-0,3-6,2-6 | |
| WTA Hamburg | 07/19 09:00 | 25 | [165] Joanne Zuger v Jule Niemeier [102] | 6-4,0-6,6-4 | |
| WTA Lausanne | 07/15 10:00 | 27 | [79] Anastasia Potapova v Jule Niemeier [109] | 6-4,6-2 | |
| WTA Lausanne | 07/14 12:20 | 26 | [109] Jule Niemeier v Eva Lys [217] | 6-4,6-2 | |
| WTA Lausanne | 07/11 12:10 | 25 | [121] Ylena In-Albon v Jule Niemeier [109] | 5-7,7-6,3-6 | |
| Wimbledon Women | 07/05 12:00 | 27 | [103] Tatjana Maria v Jule Niemeier [97] | 4-6,6-2,7-5 | |
| Wimbledon Women | 07/03 13:25 | 26 | [121] Heather Watson v Jule Niemeier [97] | 2-6,4-6 | |
| Wimbledon Women | 07/01 10:00 | 25 | [101] Lesia Tsurenko v Jule Niemeier [97] | 4-6,6-3,3-6 | |
| Wimbledon Women | 06/29 12:00 | 24 | [97] Jule Niemeier v Anett Kontaveit [3] | 6-4,6-0 | |
| Wimbledon Women | 06/27 15:05 | 23 | [97] Jule Niemeier v Xiyu Wang [105] | 6-1,6-4 | |
| WTA Bad Homburg | 06/21 17:10 | 26 | [13] Daria Kasatkina v Jule Niemeier [97] | 6-1,3-6,6-1 | |
| WTA Bad Homburg | 06/20 16:55 | 25 | [76] Claire Liu v Jule Niemeier [97] | 2-6,2-6 | |
| WTA Berlin | 06/14 10:40 | 25 | [17] Belinda Bencic v Jule Niemeier [96] | 6-4,5-7,6-3 | |
| WTA Makarska | 06/05 15:30 | 29 | [157] Elisabetta Cocciaretto v Jule Niemeier [102] | 5-7,1-6 | |
| WTA Makarska | 06/04 17:35 | 28 | [184] Linda Noskova v Jule Niemeier [102] | 2-6,1-6 | |
| WTA Makarska | 06/03 15:25 | 27 | [102] Jule Niemeier v Anastasia Gasanova [154] | 6-2,7-5 | |
| WTA Makarska | 06/02 13:05 | 26 | [102] Jule Niemeier v Xiyu Wang [110] | 6-7,6-2,6-4 | |
| WTA Makarska | 05/31 11:45 | 25 | [102] Jule Niemeier v Astra Sharma [124] | Retired | |
| French Open Women | 05/22 09:00 | 23 | [64] Sloane Stephens v Jule Niemeier [102] | 5-7,6-4,6-2 | |
| French Open Women | 05/19 10:00 | 19 | [103] Jule Niemeier v Moyuka Uchijima [209] | 6-0,6-1 | |
| French Open Women | 05/18 11:30 | 15 | [103] Jule Niemeier v Jessika Ponchet [197] | 6-4,6-0 | |
| French Open Women | 05/16 09:55 | 14 | [103] Jule Niemeier v Alexandra Cadantu-Ignatik [152] | 6-1,6-1 | |
| WTA Karlsruhe | 05/12 13:00 | 26 | [94] Jule Niemeier v Bernarda Pera [116] | 6-3,4-6,6-7 | |
| 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 |