| ITF W25 Hua Hin | 10/13 04:50 | 26 | Mananchaya Sawangkaew v Natalia Siedliska | 6-3,6-2 | |
| ITF W25 Hua Hin | 10/11 09:55 | 25 | Lesley P Kerkhove v Mananchaya Sawangkaew | 4-6,4-6 | |
| ITF W25 Hua Hin | 10/08 03:55 | 28 | Mananchaya Sawangkaew v Zhuoxuan Bai | 1-6,1-6 | |
| ITF W25 Hua Hin | 10/07 07:30 | 27 | Mananchaya Sawangkaew v Ekaterina Reyngold | 6-4,6-1 | |
| ITF W25 Hua Hin | 10/06 05:30 | 26 | Mananchaya Sawangkaew v Emily Welker | 7-6,6-7,7-6 | |
| ITF W25 Hua Hin | 10/04 03:25 | 25 | Peangtarn Plipuech v Mananchaya Sawangkaew | 6-3,3-6,4-6 | |
| ITF W15 Chiang Rai | 06/19 02:00 | 29 | Mananchaya Sawangkaew v Naho Sato | 4-6,2-6 | |
| ITF W15 Chiang Rai | 06/18 04:40 | 28 | Punnin Kovapitukted v Mananchaya Sawangkaew | 2-6,3-6 | |
| ITF W15 Chiang Rai | 06/17 02:00 | 27 | Mananchaya Sawangkaew v Patcharin Cheapchandej | 7-6,5-7,6-3 | |
| ITF W15 Chiang Rai | 06/16 07:10 | 26 | Mananchaya Sawangkaew v Kamonwan Buayam | 6-1,6-2 | |
| ITF W15 Chiang Rai | 06/15 01:50 | 25 | Gozal Ainitdinova v Mananchaya Sawangkaew | 3-6,2-6 | |
| ITF W15 Norman | 10/13 17:30 | 25 | Mia Kupres v Mananchaya Sawangkaew | 6-4,7-6 | |
| ITF W15 Lubbock | 10/02 17:00 | 28 | Adriana Reami v Mananchaya Sawangkaew | 6-1,3-6,7-6 | |
| ITF W15 Lubbock | 10/01 16:30 | 27 | Mananchaya Sawangkaew v Layne Sleeth | Retired | |
| ITF W15 Lubbock | 09/30 15:00 | 26 | Mananchaya Sawangkaew v Ayumi Miyamoto | 6-0,6-1 | |
| ITF W15 Lubbock | 09/29 17:00 | 25 | Mananchaya Sawangkaew v Carmen Corley | 6-3,6-3 | |
| ITF W25 Fort Worth | 09/20 14:00 | 54 | Mananchaya Sawangkaew v McCartney Kessler | 6-7,2-6 | |
| ITF W25 Jodhpur | 02/20 06:05 | 26 | Berfu Cengiz v Mananchaya Sawangkaew | 6-0,7-5 | |
| ITF W25 Jodhpur | 02/19 08:35 | 25 | Ekaterina Nikiforova v Mananchaya Sawangkaew | 4-6,4-6 | |
| WTA Hua Hin | 02/08 09:40 | 45 | Chihiro Muramatsu v Mananchaya Sawangkaew | 3-6,6-0,6-3 | |
| ITF W25 Nonthaburi | 02/05 05:40 | 25 | Bibiane Schoofs v Mananchaya Sawangkaew | Retired | |
| ITF W25 Nonthaburi | 02/04 02:30 | 44 | Mananchaya Sawangkaew v Ying Zhang | 4-6,6-3,10-6 | |
| ITF W25 Nonthaburi | 02/03 04:35 | 44 | Mananchaya Sawangkaew v Jiho Shin | 6-3,6-0 | |
| ITF W25 Nonthaburi | 02/02 08:25 | 44 | Mananchaya Sawangkaew v Maria Filimonikhina | 6-0,6-0 | |
| ITF W25 Nonthaburi | 01/29 04:20 | 25 | Mananchaya Sawangkaew v Leonie Kung | 6-4,2-6,3-6 | |
| ITF W25 Nonthaburi | 01/28 02:30 | 44 | Katarzyna Kawa v Mananchaya Sawangkaew | 2-6,2-6 | |
| ITF W25 Nonthaburi | 01/27 02:30 | 44 | Ying Zhang v Mananchaya Sawangkaew | 3-6,2-6 | |
| ITF W25 Nonthaburi | 01/26 03:50 | 44 | Natthapat Piwbangruk v Mananchaya Sawangkaew | 2-6,1-6 | |
| ITF W25 Puné | 12/09 05:30 | 54 | Mananchaya Sawangkaew v Punnin Kovapitukted | 1-6,7-6,10-12 | |
| ITF W25 Puné | 12/08 05:50 | 54 | Mananchaya Sawangkaew v Humera Begum Shaik | 6-0,6-1 |
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.