| 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.