Stadium: Stadium Round: 45 Ground: Hardcourt outdoor
| ITF USA F19B | 2018/07/19 17:00 | Glasspool, Lloyd v Thomas, Danny | 7-6,7-6 |
| ITF USA F19B | 2018/07/18 15:00 | Lebedev, Alexander v Thomas, Danny | 5-7,2-6 |
| Winnetka, USA | 2018/07/09 17:00 | Thomas, Danny v Kelly, Dayne | 6-4,3-6,5-7 |
| ITF USA F17 | 2018/06/26 16:45 | Thomas, Danny v Marc-Andrea Huesler | 7-5,5-7,6-7 |
| ITF USA F15 | 2018/06/19 14:00 | Thomas, Danny v Karue Sell | 6-3,6-7,6-7 |
| ITF USA F13 Qual | 2018/06/09 15:30 | Thomas, Danny v Seraphim, Christian | 6-7,4-6 |
| Challenger Savannah Qual | 2018/04/29 16:55 | Karue Sell v Thomas, Danny | 6-3,6-1 |
| Challenger Savannah Qual | 2018/04/28 17:45 | Lawson, Alex v Thomas, Danny | 4-6,0-6 |
| Atlanta, USA | 2018/07/26 16:00 | Ebden, Matthew v Young, Donald | 6-4,6-4 |
| Atlanta, USA | 2018/07/23 23:00 | Karlovic, Ivo v Young, Donald | 6-2,6-7,6-7 |
| Newport, USA | 2018/07/16 16:20 | Young, Donald v Vasek Pospisil | 6-7,1-6 |
| Winnetka, USA | 2018/07/10 20:55 | Darian King v Young, Donald | 6-3,5-7,6-1 |
| Wimbledon Qual | 2018/06/26 17:25 | Dennis Novak v Young, Donald | 6-2,7-5 |
| Wimbledon Qual | 2018/06/25 14:35 | Max Purcell v Young, Donald | 3-6,2-6 |
| Ilkley, Great Britain | 2018/06/19 11:30 | Young, Donald v Jason Kubler | 4-6,6-7 |
| s-Hertogenbosch, Netherlands, Qualifying | 2018/06/09 10:15 | Young, Donald v Niesten, Miliaan | 4-6,2-6 |