| ITF W50 Goyang | 05/22 03:20 | 25 | Mananchaya Sawangkaew v Eunhye Lee | 7-6,5-7,3-6 | |
| ITF W75 Kurume | 05/18 01:00 | 28 | [214] Mananchaya Sawangkaew v Arina Rodionova [108] | 1-6,1-6 | |
| ITF W75 Kurume | 05/17 03:10 | 27 | [430] Miho Kuramochi v Mananchaya Sawangkaew [214] | 7-6,5-7,4-6 | |
| ITF W75 Kurume | 05/16 01:00 | 26 | Zarina Diyas v Mananchaya Sawangkaew | Walkover | |
| ITF W75 Kurume | 05/14 01:00 | 25 | [321] Polina Iatcenko v Mananchaya Sawangkaew [214] | 7-5,1-6,4-6 | |
| ITF W75 Fukuoka | 05/09 02:00 | 26 | [276] Aoi Ito v Mananchaya Sawangkaew [214] | 6-3,6-1 | |
| ITF W75 Fukuoka | 05/07 01:00 | 25 | [390] Yuki Naito v Mananchaya Sawangkaew [214] | 3-6,4-6 | |
| ITF W100 Gifu | 04/30 06:35 | 25 | [223] Mananchaya Sawangkaew v Haruka Kaji [270] | 1-6,6-3,3-6 | |
| ITF W100 Tokyo | 04/25 01:50 | 26 | [223] Mananchaya Sawangkaew v Moyuka Uchijima [130] | 1-6,7-6,4-6 | |
| ITF W100 Tokyo | 04/24 05:45 | 25 | [223] Mananchaya Sawangkaew v Aleksandra Krunic [110] | 6-4,2-6,6-3 | |
| ITF W35 Osaka | 04/13 02:45 | 28 | [371] Sayaka Ishii v Mananchaya Sawangkaew [227] | 7-5,7-5 | |
| ITF W35 Osaka | 04/12 01:00 | 27 | [291] Aoi Ito v Mananchaya Sawangkaew [227] | 3-6,4-6 |
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.