| ITF - W50 Shenzhen | 04/14 02:00 | 29 | [232] Xinyu Gao v Sijia Wei [204] | 6-4,6-4 | |
| ITF - W50 Shenzhen | 04/13 02:30 | 28 | [204] Sijia Wei v Valeria Savinykh [160] | 6-3,6-1 | |
| ITF - W50 Shenzhen | 04/12 01:55 | 27 | [204] Sijia Wei v Fangzhou Liu [471] | 2-6,7-5,6-2 | |
| ITF - W50 Shenzhen | 04/11 03:30 | 26 | [204] Sijia Wei v Evialina Laskevich [457] | 6-2,3-6,6-2 | |
| ITF - W50 Shenzhen | 04/10 03:30 | 25 | [204] Sijia Wei v Hong Yi Cody Wong [426] | 6-2,7-5 | |
| ITF - W50 Kashiwa | 04/07 01:55 | 29 | [237] Sijia Wei v Ya-Hsuan Lee [356] | 6-1,7-5 | |
| ITF - W50 Kashiwa | 04/06 02:45 | 28 | [142] Arianne Hartono v Sijia Wei [237] | 5-7,6-7 | |
| ITF - W50 Kashiwa | 04/05 05:30 | 27 | [434] Hong Yi Cody Wong v Sijia Wei [237] | 6-1,4-6,0-6 | |
| ITF - W50 Kashiwa | 04/04 05:25 | 26 | [288] En Shuo Liang v Sijia Wei [237] | 5-7,2-6 | |
| ITF - W50 Kashiwa | 04/03 01:00 | 25 | [412] Miho Kuramochi v Sijia Wei [237] | 2-6,7-6,2-6 | |
| ITF W50 - Kofu | 03/27 05:20 | 25 | [231] Sijia Wei v Catherine Harrison [501] | 6-7,4-6 | |
| ITF - W35 Traralgon | 02/21 04:45 | 25 | [208] Sijia Wei v Sayaka Ishii [385] | 2-6,6-7 | |
| ITF - W75 Burnie | 02/09 23:30 | 28 | [446] Maya Joint v Sijia Wei [222] | 6-3,6-4 | |
| ITF - W75 Burnie | 02/09 01:05 | 27 | [222] Sijia Wei v Haruka Kaji [266] | 6-3,6-4 | |
| ITF - W75 Burnie | 02/07 23:00 | 26 | Sijia Wei v Emerson Jones | 6-3,6-3 | |
| ITF - W75 Burnie | 02/06 00:25 | 25 | Sijia Wei v Irina Fetecau | 3-6,6-4,7-6 | |
| ITF - W75 Burnie | 01/30 23:00 | 25 | [215] Sijia Wei v Ena Shibahara [487] | 2-6,6-7 | |
| Australian Open - Dames | 01/12 00:20 | 19 | [110] Brenda Fruhvirtova v Sijia Wei [236] | 6-2,6-4 | |
| Australian Open - Dames | 01/11 01:20 | 15 | Melisa Ercan v Sijia Wei | Walkover | |
| Australian Open - Dames | 01/09 02:50 | 14 | [236] Sijia Wei v Viktoria Hruncakova [157] | 6-3,6-2 | |
| ITF - W40 Yokohama | 12/02 02:00 | 28 | Aliona Falei v Sijia Wei | Walkover | |
| ITF - W40 Yokohama | 12/02 01:00 | 26 | Rina Saigo v Sijia Wei | Cancelled | |
| ITF - W40 Yokohama | 12/01 00:50 | 27 | [173] Yuriko Miyazaki v Sijia Wei [235] | 3-6,3-6 | |
| ITF - W40 Yokohama | 11/30 02:45 | 26 | [254] Wushuang Zheng v Sijia Wei [235] | 6-4,4-6,3-6 | |
| ITF - W40 Yokohama | 11/29 04:00 | 25 | [14] Ena Shibahara v Sijia Wei [235] | Retired | |
| ITF - W100 Takasaki | 11/21 01:00 | 54 | [233] Sijia Wei v Hanyu Guo [420] | 4-6,4-6 | |
| ITF - W100 Takasaki | 11/20 04:10 | 54 | [269] Sijia Wei v Naho Sato [448] | 6-4,2-6,6-2 | |
| ITF - W100 Takasaki | 11/18 02:00 | 28 | [140] Harriet Dart v Sijia Wei [269] | 4-6,6-2,6-1 | |
| ITF - W100 Takasaki | 11/17 06:00 | 27 | Sijia Wei v Ena Koike | 6-4,6-3 | |
| ITF - W100 Takasaki | 11/16 01:00 | 26 | [128] Mai Hontama v Sijia Wei [269] | 2-6,4-6 |
Wei Sijia (born 3 December 2003) is a Chinese tennis player.
Wei has a career-high singles ranking by the WTA of 229, achieved on 4 December 2023. She also has a career-high WTA doubles ranking of 257, achieved on the same date.