| 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 | |
| ITF W35 - Osaka | 04/11 01:00 | 26 | [410] Miho Kuramochi v Mananchaya Sawangkaew [227] | 4-6,6-3,5-7 | |
| ITF W35 - Osaka | 04/10 05:05 | 25 | Hikaru Sato v Mananchaya Sawangkaew | 6-7,4-6 | |
| ITF W50 - Kashiwa | 04/02 05:05 | 25 | Mananchaya Sawangkaew v Chihiro Muramatsu | 6-3,5-7,4-6 | |
| ITF W50 - Kofu | 03/30 01:00 | 28 | [247] Mananchaya Sawangkaew v Ya-Hsuan Lee [413] | 4-6,4-6 | |
| ITF W50 - Kofu | 03/29 04:30 | 27 | Maegan Manasse v Mananchaya Sawangkaew | 6-3,4-6,4-6 | |
| ITF W50 - Kofu | 03/28 00:55 | 26 | [357] Naho Sato v Mananchaya Sawangkaew [247] | 7-6,4-6,3-6 | |
| ITF W50 - Kofu | 03/27 01:55 | 25 | [247] Mananchaya Sawangkaew v Sujeong Jang [215] | 7-5,6-4 | |
| ITF W35 - Indore | 03/16 04:30 | 28 | [239] Mananchaya Sawangkaew v Dalila Jakupovic [213] | 6-7,3-6 | |
| ITF W35 - Indore | 03/15 04:30 | 27 | [457] Jacqueline Cabaj Awad v Mananchaya Sawangkaew [239] | 2-6,1-6 | |
| ITF W35 - Indore | 03/14 04:00 | 26 | [326] Sahaja Yamalapalli v Mananchaya Sawangkaew [239] | 1-6,4-6 | |
| ITF W35 - Indore | 03/13 04:00 | 25 | [330] Rutuja Bhosale v Mananchaya Sawangkaew [239] | 2-6,0-6 | |
| ITF W75 - Burnie | 02/08 02:45 | 26 | [247] Mananchaya Sawangkaew v Maya Joint [446] | 3-6,1-6 | |
| ITF W75 - Burnie | 02/06 01:10 | 25 | [247] Mananchaya Sawangkaew v Kyoka Okamura [327] | 6-3,6-3 | |
| ITF W75 - Burnie | 02/01 23:45 | 27 | [260] Mananchaya Sawangkaew v Priscilla Hon [201] | 6-4,0-6,2-6 | |
| ITF W75 - Burnie | 02/01 01:45 | 26 | [260] Mananchaya Sawangkaew v Ivana Popovic [488] | 6-4,2-6,7-6 | |
| ITF W75 - Burnie | 01/29 23:00 | 25 | [260] Mananchaya Sawangkaew v Alana Parnaby [258] | 6-2,6-0 | |
| ITF W50 - Nonthaburi | 01/14 03:00 | 29 | [266] Mananchaya Sawangkaew v Antonia Ruzic [211] | 6-1,2-6,6-2 | |
| ITF W50 - Nonthaburi | 01/13 02:55 | 28 | [451] Sayaka Ishii v Mananchaya Sawangkaew [266] | 6-3,2-6,5-7 | |
| ITF W50 - Nonthaburi | 01/12 02:55 | 27 | [452] Misaki Matsuda v Mananchaya Sawangkaew [266] | 6-4,4-6,1-6 | |
| 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 |
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.