| ITF - W40 Hongkong | 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 Anchisa Chanta | 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 | |
| ITF - W25 Daegu | 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 | Xinyu Jiang 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 | |
| ITF - W25 Jakarta | 03/30 06:25 | 26 | [421] Mananchaya Sawangkaew v Zhuoxuan Bai [301] | 1-6,0-6 | |
| ITF - W25 Jakarta | 03/29 05:50 | 25 | [239] Valeria Savinykh v Mananchaya Sawangkaew [421] | 1-6,2-6 | |
| ITF - W25 Jakarta | 03/28 04:45 | 44 | Mananchaya Sawangkaew v Mio Mushika | 6-3,6-3 | |
| ITF - W25 Jakarta | 03/27 06:20 | 44 | Mananchaya Sawangkaew v Mao Mushika | 6-4,6-1 | |
| ITF - W25 Jakarta | 03/24 02:00 | 27 | [421] Mananchaya Sawangkaew v Anastasia Zakharova [214] | 2-6,6-7 | |
| ITF - W25 Jakarta | 03/23 02:00 | 26 | [421] Mananchaya Sawangkaew v Xinyu Gao [330] | 6-2,6-2 | |
| ITF - W25 Jakarta | 03/22 03:35 | 25 | [297] Arina Rodionova v Mananchaya Sawangkaew [421] | 6-7,3-6 | |
| ITF - W25 Jakarta | 03/21 04:10 | 19 | Mananchaya Sawangkaew v Nana Kawagishi | 6-3,6-0 | |
| ITF - W25 Jakarta | 03/20 03:00 | 44 | Mananchaya Sawangkaew v Sunam Jeong | 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] Misaki Doi 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 | |
| ITF - W40 Nonthaburi | 01/14 02:55 | 28 | Mananchaya Sawangkaew v Anastasia Kulikova | Walkover |
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.