| ITF Women Rancho Santa Fe | 02/24 22:25 | 28 | Ann Li v Kurumi Nara | 4-6,6-2,1-6 | |
| ITF Women Rancho Santa Fe | 02/23 20:10 | 27 | Elitsa Kostova v Kurumi Nara | 6-7,0-6 | |
| ITF Women Rancho Santa Fe | 02/22 21:45 | 26 | Allie Kiick v Kurumi Nara | 0-6,2-6 | |
| ITF Women Rancho Santa Fe | 02/22 01:35 | 25 | Robin Anderson v Kurumi Nara | 2-6,3-6 | |
| 2018 Fed Cup | 02/10 04:30 | 29 | Zarina Diyas v Kurumi Nara | 5-7,4-6 | |
| 2018 Fed Cup | 02/08 04:30 | - | Kurumi Nara v Sunam Jeong | 6-3,6-0 | |
| 2018 Fed Cup | 02/07 04:30 | - | Kurumi Nara v Peangtarn Plipuech | 6-0,6-2 | |
| WTA Taipei | 01/30 04:00 | 25 | Kurumi Nara v Pauline Parmentier | 6-1,4-6,1-6 | |
| Australian Open Women | 01/16 00:00 | 23 | Kurumi Nara v Marketa Vondrousova | 5-7,4-6 | |
| WTA Hobart | 01/08 03:35 | 25 | Kurumi Nara v Elise Mertens | 0-6,4-6 | |
| WTA Hobart Qual | 01/07 03:00 | 46 | Madison Brengle v Kurumi Nara | 3-6,4-6 | |
| WTA Hobart Qual | 01/06 07:30 | 45 | Astra Sharma v Kurumi Nara | 0-6,1-6 | |
| WTA Auckland | 01/02 01:55 | 25 | Kurumi Nara v Johanna Larsson | 6-7,3-6 | |
| WTA Honolulu | 11/20 22:20 | 25 | [102] Kurumi Nara v Ajla Tomljanovic [136] | 2-6,2-6 | |
| ITF Women Tokyo | 11/11 05:00 | 28 | [36] Shuai Zhang v Kurumi Nara [101] | 3-6,6-1,6-3 | |
| ITF Women Tokyo | 11/10 03:50 | 27 | [101] Kurumi Nara v Georgia Brescia [218] | 6-3,4-6,7-5 | |
| ITF Women Tokyo | 11/09 05:45 | 26 | [101] Kurumi Nara v Miyabi Inoue [332] | 6-3,6-2 | |
| ITF Women Tokyo | 11/07 02:40 | 25 | [101] Kurumi Nara v Yuuki Tanaka [383] | 7-5,6-1 | |
| ITF Women Liuzhou | 10/25 06:50 | 25 | [469] Yuxuan Zhang v Kurumi Nara [102] | Retired | |
| ITF Women Suzhou | 10/21 04:55 | 28 | [180] Sara Errani v Kurumi Nara [103] | 3-6,6-3,6-3 | |
| ITF Women Suzhou | 10/20 04:00 | 27 | [178] Jing-Jing Lu v Kurumi Nara [103] | 6-2,5-7,2-6 | |
| ITF Women Suzhou | 10/19 03:55 | 26 | Kaja Juvan v Kurumi Nara | 1-6,2-6 | |
| ITF Women Suzhou | 10/18 02:00 | 25 | [287] Fang Ying Xun v Kurumi Nara [103] | 3-6,2-6 | |
| WTA Hong Kong | 10/09 09:20 | 25 | [101] Kurumi Nara v Shuai Zhang [31] | 0-6,0-6 | |
| WTA Tashkent | 09/29 05:00 | 27 | [109] Kurumi Nara v Kateryna Bondarenko [133] | 2-6,7-5,4-6 | |
| WTA Tashkent | 09/27 09:05 | 26 | [41] Kristyna Pliskova v Kurumi Nara [109] | 6-7,1-6 | |
| WTA Tashkent | 09/26 05:00 | 25 | [282] Nigina Abduraimova v Kurumi Nara [109] | 1-6,1-6 | |
| WTA Tokyo | 09/21 04:30 | 26 | [114] Kurumi Nara v Caroline Garcia [20] | 1-6,3-6 | |
| WTA Tokyo | 09/18 04:15 | 25 | [108] Kurumi Nara v Yulia Putintseva [52] | 2-6,6-4,6-2 | |
| WTA Tokyo | 09/14 03:30 | 26 | [57] Qiang Wang v Kurumi Nara [108] | 6-2,6-3 |