Stadium: Court 4 Round: 26 Ground: Hardcourt outdoor
| Challenger Stockton | 2018/10/01 22:00 | Marc Polmans v Jay Clarke | 6-3,6-0 |
| Challenger Tiburon | 2018/09/24 18:35 | Jay Clarke v JC Aragone | 2-6,6-7 |
| US Open | 2018/08/22 15:00 | Liam Broady v Jay Clarke | 6-3,6-1 |
| Challenger Aptos | 2018/08/09 20:35 | Jay Clarke v Liam Broady | 6-7,4-6 |
| Challenger Aptos | 2018/08/07 17:00 | Jay Clarke v Illya Marchenko | 6-3,2-6,6-3 |
| Challenger Lexington | 2018/08/03 00:45 | Andrew Harris v Jay Clarke | 3-6,3-6 |
| Challenger Lexington | 2018/07/31 22:10 | Edan Leshem v Jay Clarke | 4-6,4-6 |
| Challenger Binghamton | 2018/07/29 16:40 | Jordan Thompson v Jay Clarke | 7-6,6-7,4-6 |
| ATP Tokyo | 2018/09/30 03:50 | Tatsuma Ito v Yosuke Watanuki | 2-6,4-6 |
| ATP Tokyo | 2018/09/29 04:45 | Mackenzie McDonald v Tatsuma Ito | 4-6,6-1,3-6 |
| ATP Shenzhen | 2018/09/25 12:15 | Tatsuma Ito v Taro Daniel | 6-2,5-7,6-7 |
| ATP Shenzhen | 2018/09/22 08:10 | Federico Gaio v Tatsuma Ito | 6-4,3-6,1-6 |
| Challenger Zhangjiagang | 2018/09/06 06:10 | Yibing Wu v Tatsuma Ito | 7-6,4-6,6-3 |
| Challenger Zhangjiagang | 2018/09/04 03:45 | Steven Diez v Tatsuma Ito | 4-6,1-6 |
| US Open | 2018/08/22 19:10 | Thiago Monteiro v Tatsuma Ito | 7-5,6-7,6-2 |
| Challenger Jinan | 2018/08/08 07:30 | Roman Safiullin v Tatsuma Ito | 7-6,7-5 |