Round: 60 Ground: Hardcourt outdoor
| ITF USA F22 Qual | 2018/08/05 16:00 | Siegler, Louis v Blumenberg, Alex | 6-3,3-6,2-6 |
| ITF USA F22 Qual | 2018/08/04 16:00 | Gore, Rico v Siegler, Louis | 0-6,0-6 |
| Challenger Bastad Qual | 2018/07/07 08:15 | Siegler, Louis v Patael, Ben | 0-6,1-6 |
| ITF USA F12 | 2018/04/22 18:30 | Torres, Richard v Siegler, Louis | 7-5,6-0 |
| ITF USA F11 | 2018/04/14 16:30 | Siegler, Louis v Acob, Zandrix | 4-6,2-6 |
| ITF USA F6 | 2018/01/29 16:00 | Siegler, Louis v Pratt, Jared | 0-6,4-6 |
| ITF USA F6 | 2018/01/28 13:30 | Siegler, Louis v van Meter, Joseph W | 6-2,6-1 |
| ITF USA F6 | 2018/01/27 14:00 | Mercier, Tyler v Siegler, Louis | 4-6,6-2,3-6 |
| ITF Serbia F1 | 2018/08/08 13:50 | Cungu, Rrezart v Frawley, James | 1-6,6-2,4-6 |
| Challenger - Prague | 2018/07/21 08:00 | Cungu, Rrezart v Nejedly, Pavel | 2-6,1-6 |
| ITF USA F15 | 2018/06/20 18:00 | Schneider, Ronnie v Cungu, Rrezart | 6-2,6-4 |
| ITF USA F13 Qual | 2018/06/10 14:00 | Cungu, Rrezart v Brymer, Gage | 5-7,3-6 |
| Coupe Davis | 2018/04/07 09:00 | Cungu, Rrezart v Agius, Denzil | 6-0,6-0 |
| Coupe Davis | 2018/04/06 08:00 | Cungu, Rrezart v Stergiou, Ioannis | 7-6,6-2 |
| Coupe Davis | 2018/04/05 08:00 | Lazdins, Arturs v Cungu, Rrezart | 3-6,1-6 |
| Coupe Davis | 2018/04/04 07:00 | Cungu, Rrezart v Asatryan, Torgom | 6-3,6-0 |