| 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 |
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.