| ITF W25 Pune | 12/08 05:50 | 54 | Mananchaya Sawangkaew v Humera Begum Shaik | 6-0,6-1 | |
| 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 |
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.