Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF China F4 | 2018/05/02 03:00 | Fajing Sun v Xia, Zihao | 2-6,6-3,6-3 |
| ITF China F4 | 2018/04/30 04:40 | Guo, Tianjia v Xia, Zihao | 0-6,0-6 |
| Nanchang, China | 2018/04/16 04:30 | Xia, Zihao v Antoine Escoffier | 4-6,2-6 |
| Challenger Qujing | 2018/03/20 03:35 | Salvatore Caruso v Xia, Zihao | 6-3,6-1 |
| Shenzhen, China, Qualifying | 2018/03/11 03:50 | Jason Kubler v Xia, Zihao | 6-1,6-1 |
| Challenger Zhuhai | 2018/03/06 04:40 | Wu, Di v Xia, Zihao | 6-4,6-4 |
| Challenger Zhuhai Qual | 2018/03/04 08:45 | Kuan-Yi Lee v Xia, Zihao | 6-7,1-6 |
| Challenger Zhuhai Qual | 2018/03/03 02:00 | Xia, Zihao v Andrea Pellegrino | 6-2,6-4 |
| Challenger - Glasgow | 2018/05/04 13:50 | Heliovaara, Harri v Viola, Matteo | 7-5,2-6,5-7 |
| Challenger - Glasgow | 2018/05/03 15:00 | Ward, James v Heliovaara, Harri | 5-7,4-6 |
| Challenger - Glasgow | 2018/05/01 10:45 | Heliovaara, Harri v Gray, Jonathan | 6-3,6-1 |
| Challenger Glasgow Qual | 2018/04/29 15:00 | Heliovaara, Harri v Bossel, Adrien | 2-6,7-6,6-4 |
| Challenger Glasgow Qual | 2018/04/28 14:20 | Heliovaara, Harri v Scott Duncan | 6-1,6-4 |
| Coupe Davis | 2018/04/08 10:30 | Heliovaara, Harri v Ricardas Berankis | 2-6,3-6 |
| Coupe Davis | 2018/04/07 13:00 | Heliovaara, Harri v Grigelis, Laurynas | 6-3,1-6,6-3 |
| ITF Israel F3 | 2018/03/24 07:00 | Vandenbulcke, Yannick v Heliovaara, Harri | 6-2,6-2 |