| ITF - W50 Nonthaburi | 01/11 04:50 | 26 | [373] Aoi Ito v Mananchaya Sawangkaew [266] | 7-6,2-6,3-6 | |
| ITF - W50 Nonthaburi | 01/10 03:00 | 25 | [307] Diana Marcinkevica v Mananchaya Sawangkaew [266] | 3-6,2-6 | |
| ITF - W50 Nonthaburi | 01/03 05:50 | 25 | [266] Mananchaya Sawangkaew v Ena Shibahara [14] | 3-6,6-7 | |
| ITF - W40 Yokohama | 12/01 03:10 | 27 | [249] Mananchaya Sawangkaew v Ayano Shimizu [368] | 6-0,4-6,3-6 | |
| ITF - W40 Yokohama | 11/30 02:25 | 26 | Mananchaya Sawangkaew v Mei Yamaguchi | 6-4,6-4 | |
| ITF - W40 Yokohama | 11/29 06:55 | 25 | [215] Anastasia Tikhonova v Mananchaya Sawangkaew [249] | 6-7,6-1,3-6 | |
| ITF - W100 Takasaki | 11/22 01:30 | 25 | [120] Harriet Dart v Mananchaya Sawangkaew [248] | 6-2,6-1 | |
| ITF - W100 Takasaki | 11/21 03:10 | 54 | [248] Mananchaya Sawangkaew v Aoi Ito [427] | 4-6,4-6 | |
| ITF - W100 Takasaki | 11/20 01:00 | 54 | Mananchaya Sawangkaew v Himari Sato | 6-1,6-3 | |
| ITF - W100 Takasaki | 11/17 06:00 | 27 | [263] Mananchaya Sawangkaew v En Shuo Liang [294] | 5-7,6-3,2-6 | |
| ITF - W100 Takasaki | 11/16 05:20 | 26 | [89] Linda Fruhvirtova v Mananchaya Sawangkaew [263] | 3-6,6-7 | |
| ITF - W100 Takasaki | 11/15 01:00 | 25 | [263] Mananchaya Sawangkaew v Ya Yi Yang [216] | 7-6,7-5 | |
| ITF - W100 Takasaki | 11/13 07:45 | 54 | [263] Mananchaya Sawangkaew v Miho Kuramochi [452] | 6-2,6-4 | |
| ITF - W100 Takasaki | 11/13 02:55 | 54 | [263] Mananchaya Sawangkaew v Eri Shimizu [442] | 6-7,6-3,6-4 | |
| ITF - W25 Qian Daohu | 10/28 02:00 | 28 | Mananchaya Sawangkaew v Anastasiia Gureva | 6-1,4-6,5-7 | |
| ITF - W25 Qian Daohu | 10/27 02:00 | 27 | Mananchaya Sawangkaew v Meiqi Guo | 6-1,6-4 | |
| ITF - W25 Qian Daohu | 10/26 01:55 | 26 | [270] Mananchaya Sawangkaew v Shuo Feng [224] | 6-3,6-2 | |
| ITF - W25 Qian Daohu | 10/25 06:00 | 25 | Mananchaya Sawangkaew v Sofia Shapatava | 6-1,6-2 | |
| ITF - W100 Shenzhen | 10/17 05:35 | 25 | [264] Mananchaya Sawangkaew v Hong Yi Cody Wong [347] | 6-2,1-6,3-6 | |
| ITF - W25 Nakhon Si Thammarat | 09/09 02:00 | 28 | [231] Anastasia Zakharova v Mananchaya Sawangkaew [267] | 6-7,6-4,6-1 | |
| ITF - W25 Nakhon Si Thammarat | 09/08 03:50 | 27 | [267] Mananchaya Sawangkaew v Aliona Falei [415] | 6-0,6-2 | |
| ITF - W25 Nakhon Si Thammarat | 09/07 04:30 | 26 | [267] Mananchaya Sawangkaew v Punnin Kovapitukted [331] | 6-3,6-3 | |
| ITF - W25 Nakhon Si Thammarat | 09/05 02:00 | 25 | Mananchaya Sawangkaew v Vaidehi Chaudhari | 6-4,6-4 | |
| ITF - W25 Nakhon Si Thammarat | 09/01 04:10 | 27 | [402] Daria Lodikova v Mananchaya Sawangkaew [267] | 7-5,6-4 | |
| ITF - W25 Nakhon Si Thammarat | 08/31 06:15 | 26 | [475] Anchisa Chanta v Mananchaya Sawangkaew [267] | 1-6,2-6 | |
| ITF - W25 Nakhon Si Thammarat | 08/30 02:00 | 25 | [326] Zongyu Li v Mananchaya Sawangkaew [267] | 6-7,6-3,3-6 | |
| ITF - W40 Hongkong | 08/27 02:00 | 29 | [303] Mananchaya Sawangkaew v Ya Yi Yang [288] | 3-6,6-4,3-6 | |
| ITF - W40 Hongkong | 08/26 01:50 | 28 | [303] Mananchaya Sawangkaew v Kyoka Okamura [286] | 6-0,6-7,6-3 | |
| ITF - W40 Hongkong | 08/25 02:00 | 27 | [233] Eudice Chong v Mananchaya Sawangkaew [303] | 4-6,3-6 | |
| ITF - W40 Hongkong | 08/24 04:40 | 26 | [303] Mananchaya Sawangkaew v Misaki Matsuda [297] | 7-5,6-3 |
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.