| 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 Šen-čen | 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.