| ITF - W25 Solapur | 12/05 05:40 | 26 | Sandra Samir v Mananchaya Sawangkaew | 6-3,6-2 | |
| ITF - W25 Solapur | 12/04 05:25 | 25 | Mananchaya Sawangkaew v Emily Webley-Smith | 6-3,7-6 | |
| ITF - W25 Hua Hin | 11/14 03:00 | 26 | Mananchaya Sawangkaew v Lesley Pattinama Kerkhove | 1-6,6-2,4-6 | |
| ITF - W25 Hua Hin | 11/12 05:45 | 25 | Xinyu Gao v Mananchaya Sawangkaew | 5-7,7-5,6-7 | |
| ITF - W25 Hua Hin | 11/07 04:35 | 26 | Kyoka Okamura v Mananchaya Sawangkaew | 6-3,7-6 | |
| ITF - W25 Hua Hin | 11/06 04:15 | 25 | Mananchaya Sawangkaew v Diana Marcinkevica | 6-3,1-6,6-2 | |
| ITF - W15 Hua Hin | 10/20 02:55 | 29 | Mananchaya Sawangkaew v Moyuka Uchijima | 2-6,4-6 | |
| ITF - W15 Hua Hin | 10/19 04:30 | 28 | Olga Helmi v Mananchaya Sawangkaew | 2-6,1-6 | |
| ITF - W15 Hua Hin | 10/18 03:00 | 27 | Yeon Woo Ku v Mananchaya Sawangkaew | 1-6,1-6 | |
| ITF - W15 Hua Hin | 10/17 03:00 | 26 | Patcharin Cheapchandej v Mananchaya Sawangkaew | 2-6,3-6 | |
| ITF - W15 Hua Hin | 10/16 05:00 | 25 | Natthapat Piwbangruk v Mananchaya Sawangkaew | 0-6,0-6 | |
| ITF - W15 Hua Hin | 10/09 03:00 | 25 | Ayumi Koshiishi v Mananchaya Sawangkaew | 6-2,6-3 | |
| ITF - W25 Nonthaburi | 08/03 03:00 | 28 | Yuki Naito v Mananchaya Sawangkaew | 6-3,6-4 | |
| ITF - W25 Nonthaburi | 08/02 03:00 | 27 | Mananchaya Sawangkaew v Rutuja Bhosale | 6-1,6-4 | |
| ITF - W25 Nonthaburi | 08/01 02:30 | 26 | Mananchaya Sawangkaew v Eudice Chong | 6-2,6-2 | |
| ITF - W25 Nonthaburi | 07/31 06:35 | 25 | Su Jeong Jang v Mananchaya Sawangkaew | Retired | |
| ITF - W25 Nonthaburi | 07/30 04:05 | 54 | Eunhye Lee v Mananchaya Sawangkaew | 2-6,2-6 | |
| ITF - W25 Nonthaburi | 07/29 05:00 | 54 | Kamonwan Buayam v Mananchaya Sawangkaew | 3-6,2-6 | |
| ITF - W25 Nonthaburi | 07/25 02:30 | 26 | Sabina Sharipova v Mananchaya Sawangkaew | 6-4,6-4 | |
| ITF - W25 Nonthaburi | 07/24 02:00 | 25 | Mananchaya Sawangkaew v Ji-Hee Choi | 5-7,6-2,6-1 | |
| ITF - W25 Nonthaburi | 07/23 03:55 | 54 | Kai-Chen Chang v Mananchaya Sawangkaew | 2-6,5-7 | |
| ITF - W25 Nonthaburi | 07/22 02:30 | 54 | Mananchaya Sawangkaew v Himeno Sakatsume | 7-6,3-6,10-4 | |
| ITF - W25 Nonthaburi | 05/28 05:00 | 54 | Supapitch Kuearum v Mananchaya Sawangkaew | 2-6,7-6,10-3 | |
| ITF - W25 Nonthaburi | 05/27 07:05 | 54 | Yatawee Chimchum v Mananchaya Sawangkaew | 1-6,0-6 | |
| ITF - W25 Nonthaburi | 05/24 04:00 | 27 | Mananchaya Sawangkaew v Akiko Omae | Retired | |
| ITF - W25 Nonthaburi | 05/23 03:00 | 26 | Simona Waltert v Mananchaya Sawangkaew | 4-6,6-1,4-6 | |
| ITF - W25 Nonthaburi | 05/22 03:00 | 25 | Mananchaya Sawangkaew v Mahak Jain | 6-1,7-5 | |
| ITF - W25 Nonthaburi | 05/21 04:10 | 54 | Alana Parnaby v Mananchaya Sawangkaew | 2-6,0-6 | |
| ITF - W25 Nonthaburi | 05/20 05:55 | 54 | Ashley McKenzie v Mananchaya Sawangkaew | 1-6,0-6 | |
| ITF - W15 Sharm El Sheikh | 04/06 08:00 | 28 | Mananchaya Sawangkaew v Magali Kempen | 6-4,1-6,2-6 |
Mananchaya Sawangkaew (Thai: มนัญชญา สว่างแก้ว; born 10 July 2002) is a tennis player from Thailand.
She has a career-high singles ranking of 247 by the Women's Tennis Association (WTA), achieved on 4 December 2023. Sawangkaew has won two singles titles and one doubles title on the ITF Women's Circuit.
On the ITF Junior Circuit, she achieved a career-high combined ranking of 14, on 28 January 2019. She reached the quarterfinals of the girls' singles draw at the 2019 Australian Open.
Sawangkaew made her debut for Thailand Fed Cup team in 2019.