| ITF W40 Hong Kong | 08/24 04:40 | 26 | [303] Mananchaya Sawangkaew v Misaki Matsuda [297] | 7-5,6-3 | |
| ITF W40 Hong Kong | 08/22 02:00 | 25 | [371] Ya-Hsuan Lee v Mananchaya Sawangkaew [303] | 2-6,0-6 | |
| ITF W25 Nakhon Si Thammarat | 07/09 03:00 | 29 | [394] Sahaja Yamalapalli v Mananchaya Sawangkaew [370] | 4-6,0-6 | |
| ITF W25 Nakhon Si Thammarat | 07/08 02:00 | 28 | [473] Luksika Kumkhum v Mananchaya Sawangkaew [370] | 6-3,4-6,0-6 | |
| ITF W25 Nakhon Si Thammarat | 07/07 02:00 | 27 | Mananchaya Sawangkaew v Chanta, Aunchisa | 6-2,6-2 | |
| ITF W25 Nakhon Si Thammarat | 07/06 03:00 | 26 | [370] Mananchaya Sawangkaew v Kaylah McPhee [476] | 6-2,6-4 | |
| ITF W25 Nakhon Si Thammarat | 07/04 02:00 | 25 | Mananchaya Sawangkaew v Miho Kuramochi | 6-4,6-1 | |
| Daegu, Singles W-ITF-KOR-04A | 06/07 01:00 | 25 | [406] Mananchaya Sawangkaew v Sohyun Park [452] | 6-4,1-6,4-6 | |
| ITF W25 Changwon | 05/31 01:00 | 25 | [484] Yeonwoo Ku v Mananchaya Sawangkaew [406] | 6-1,6-3 | |
| ITF W25 Goyang | 05/28 09:00 | 29 | [356] Hanna Chang v Mananchaya Sawangkaew [406] | 6-2,6-4 | |
| ITF W25 Goyang | 05/27 07:40 | 28 | Hanyu Guo v Mananchaya Sawangkaew | 2-6,4-6 | |
| ITF W25 Goyang | 05/26 01:55 | 27 | [400] Mananchaya Sawangkaew v Lizette Cabrera [239] | 2-6,6-3,6-3 | |
| ITF W25 Goyang | 05/25 01:00 | 26 | [395] Hong Yi Cody Wong v Mananchaya Sawangkaew [400] | 6-7,6-3,4-6 | |
| ITF W25 Goyang | 05/24 02:55 | 25 | Mananchaya Sawangkaew v Haram Kim | 6-1,6-1 | |
| Billie Jean King Cup | 04/14 04:55 | 1 | Jiang, Xinyu v Mananchaya Sawangkaew | 6-3,0-6,6-1 | |
| Billie Jean King Cup | 04/13 06:35 | 2 | [421] Yeonwoo Ku v Mananchaya Sawangkaew [394] | 6-7,6-1,2-6 | |
| Billie Jean King Cup | 04/12 06:15 | 2 | Moyuka Uchijima v Mananchaya Sawangkaew | 4-6,7-5,5-7 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/30 06:25 | 26 | [421] Mananchaya Sawangkaew v Zhuoxuan Bai [301] | 1-6,0-6 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/29 05:50 | 25 | [239] Valeria Savinykh v Mananchaya Sawangkaew [421] | 1-6,2-6 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/28 04:45 | 44 | Mananchaya Sawangkaew v Mio Mushika | 6-3,6-3 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/27 06:20 | 44 | Mananchaya Sawangkaew v Mao Mushika | 6-4,6-1 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/24 02:00 | 27 | [421] Mananchaya Sawangkaew v Anastasia Zakharova [214] | 2-6,6-7 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/23 02:00 | 26 | [421] Mananchaya Sawangkaew v Xinyu Gao [330] | 6-2,6-2 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/22 03:35 | 25 | [297] Arina Rodionova v Mananchaya Sawangkaew [421] | 6-7,3-6 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/21 04:10 | 19 | Mananchaya Sawangkaew v Nana Kawagishi | 6-3,6-0 | |
| Jakarta, Singles Qualifying W-ITF-INA-01A | 03/20 03:00 | 44 | Mananchaya Sawangkaew v Jeong, Sunam | 6-1,6-2 | |
| ITF W40 Bengaluru | 03/09 08:30 | 26 | [432] Mananchaya Sawangkaew v Dalila Jakupovic [243] | 4-6,6-4,4-6 | |
| ITF W40 Bengaluru | 03/08 04:25 | 25 | [308] Doi, Misaki v Mananchaya Sawangkaew [432] | 3-6,3-6 | |
| ITF W25 Bengaluru | 03/01 10:50 | 25 | [291] Ekaterina Reyngold v Mananchaya Sawangkaew [431] | 4-6,6-2,6-2 | |
| ITF W40 Nonthaburi | 01/15 03:00 | 29 | [428] Mananchaya Sawangkaew v Lanlana Tararudee [416] | 6-2,1-6,0-6 |
Mananchaya Sawangkaew (Thai: มนัญชญา สว่างแก้ว; born 10 July 2002) is a tennis player from Thailand. She has a career-high WTA singles ranking of world No. 192, achieved on 20 May 2024 and a doubles ranking of No. 546, achieved on 31 July 2023.
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.