| ITF Femminile Hua Hin | 06/05 04:10 | 25 | Monica Robinson v Nicha Lertpitaksinchai | 6-4,7-5 | |
| ITF Femminile Hua Hin | 05/28 05:30 | 25 | Nicha Lertpitaksinchai v Karman Kaur Thandi | 3-6,0-6 | |
| ITF Femminile Incheon - Qual. | 05/13 03:30 | 62 | Eunhye Lee v Nicha Lertpitaksinchai | 7-6,3-6,6-3 | |
| ITF Femminile Goyang - Qual. | 05/07 01:30 | 44 | Nicha Lertpitaksinchai v Eunhye Lee | 3-6,2-6 | |
| ITF femminile Osaka | 04/12 01:00 | 26 | [285] Nicha Lertpitaksinchai v Xinyu Wang [435] | 3-6,4-6 | |
| ITF femminile Osaka | 04/10 05:45 | 25 | Yuna Saito v Nicha Lertpitaksinchai | 2-6,0-6 | |
| ITF femminile Osaka - Qual. | 04/09 01:00 | 62 | [397] Yuki Kristina Chiang v Nicha Lertpitaksinchai [277] | 1-6,3-6 | |
| ITF femminile Osaka - Qual. | 04/08 03:30 | 62 | Mami Hasegawa v Nicha Lertpitaksinchai | 6-2,6-7,4-6 | |
| ITF femminile Osaka - Qual. | 04/07 04:00 | 62 | Nagisa Morimoto v Nicha Lertpitaksinchai | 0-6,3-6 | |
| ITF Femminile Kashiwa - Qual. | 04/01 00:30 | 54 | Nicha Lertpitaksinchai v Abigail Tere-Apisah | 3-6,2-6 | |
| ITF Femminile Gwalior | 03/12 06:25 | 25 | Monica Robinson v Nicha Lertpitaksinchai | 6-4,6-7,6-2 | |
| Fed Cup 2018 | 02/09 05:15 | 1 | Nicha Lertpitaksinchai v Sunam Jeong | 7-6,2-6,0-6 | |
| ITF femminile Toyota - Qual. | 11/13 06:05 | 54 | [387] Kyoka Okamura v Nicha Lertpitaksinchai [317] | 7-6,6-2 | |
| ITF femminile Toyota - Qual. | 11/12 10:10 | 54 | Ayumi Miyamoto v Nicha Lertpitaksinchai | 2-6,6-4,2-6 | |
| ITF femminile Toyota - Qual. | 11/12 04:20 | 54 | [289] Nicha Lertpitaksinchai v Yuki Kristina Chiang [469] | 7-5,6-2 | |
| WTA Hua Hin - Qual. | 11/05 04:30 | 46 | Nicha Lertpitaksinchai v Giuliana Olmos | 4-6,4-6 | |
| WTA Hua Hin - Qual. | 11/04 04:40 | 45 | Dalila Jakupovic v Nicha Lertpitaksinchai | 7-5,6-7,2-6 | |
| WTA Hong Kong - Qual. | 10/07 05:55 | 45 | [445] Nicha Lertpitaksinchai v Junri Namigata [241] | 2-6,0-6 | |
| WTA Dalian Qual | 09/03 05:25 | 45 | [332] Beatrice Gumulya v Nicha Lertpitaksinchai [381] | 7-6,6-2 | |
| ITF femminile Nonthaburi | 08/15 07:35 | 25 | Luksika Kumkhum v Nicha Lert'chai | 6-4,6-1 | |
| ITF femminile Nonthaburi | 08/09 02:30 | 26 | Nicha Lertpitaksinchai v Dhruthi T. Venugopal | 6-4,5-7,4-6 | |
| ITF femminile Nonthaburi | 08/08 02:30 | 25 | Nicha Lertpitaksinchai v Thasaporn Naklo | 6-1,6-2 | |
| ITF femminile Nonthaburi | 08/01 02:30 | 25 | [312] Nicha Lertpitaksinchai v Beatrice Gumulya [340] | 6-4,4-6,5-7 | |
| WTA Nanchang - Qual. | 07/23 09:00 | 46 | [434] Xiaodi You v Nicha Lertpitaksinchai [320] | 6-1,7-5 | |
| WTA Nanchang - Qual. | 07/22 09:35 | 45 | [320] Nicha Lertpitaksinchai v Ayano Shimizu [234] | 6-4,6-2 | |
| ITF Femminile Tientsin | 07/19 02:00 | 26 | [320] Nicha Lertpitaksinchai v Lin Zhu [118] | 2-6,3-6 | |
| ITF Femminile Tientsin | 07/18 02:00 | 25 | Jiakang Li v Nicha Lertpitaksinchai | 6-7,1-6 | |
| ITF Femminile Tokyo | 06/08 01:00 | 26 | [326] Tammi Patterson v Nicha Lertpitaksinchai [312] | 6-2,6-4 | |
| ITF Femminile Tokyo | 06/06 01:00 | 25 | Jiaxi Lu v Nicha Lertpitaksinchai | 4-6,4-6 | |
| ITF Femminile Goyang | 05/23 03:15 | 25 | Chihiro Muramatsu v Nicha Lertpitaksinchai | 6-0,6-3 |