Stadium: Center Round: 45 Ground: Hardcourt outdoor
| Challenger Chicago | 2018/09/03 22:20 | Ruan Roelofse v Alexander Sarkissian | 3-6,4-6 |
| Challenger Chicago | 2018/09/06 17:45 | Alexander Sarkissian v JC Aragone | 6-2,6-7,6-7 |
| Challenger Chicago | 2018/09/05 15:00 | Andreas Seppi v Alexander Sarkissian | 3-6,6-7 |
| Challenger Chicago | 2018/09/03 22:20 | Ruan Roelofse v Alexander Sarkissian | 3-6,4-6 |
| Challenger Chicago | 2018/09/02 21:35 | Aron Hiltzik v Alexander Sarkissian | 1-6,2-6 |
| Challenger Chicago | 2018/09/02 16:40 | Aleksandar Vukic v Alexander Sarkissian | 3-6,4-6 |
| Challenger Vancouver | 2018/08/13 19:00 | Borna Gojo v Alexander Sarkissian | 7-6,6-4 |
| Challenger Aptos | 2018/08/05 17:00 | Alexander Sarkissian v Aleksandar Vukic | 5-7,2-6 |
| Challenger Aptos | 2018/08/04 18:45 | Alexander Sarkissian v Logan Smith | 3-6,6-3,6-2 |
| Challenger Chicago | 2018/09/05 17:00 | Tommy Paul v Ruan Roelofse | 6-3,6-2 |
| Challenger Chicago | 2018/09/03 22:20 | Ruan Roelofse v Alexander Sarkissian | 3-6,4-6 |
| Challenger Chicago | 2018/09/02 22:10 | Alejandro Gonzalez v Ruan Roelofse | 4-6,6-3,3-6 |
| Challenger Chicago | 2018/09/02 17:45 | Tom Fawcett v Ruan Roelofse | 5-7,4-6 |
| Challenger Vancouver | 2018/08/11 18:20 | Ruan Roelofse v Jacob Grills | 1-6,2-6 |
| Challenger Aptos | 2018/08/04 17:20 | Ruan Roelofse v Alex Rybakov | 3-6,6-7 |
| Challenger Lexington Qual | 2018/07/30 16:00 | Alex Rybakov v Ruan Roelofse | 7-5,7-6 |
| Challenger Lexington Qual | 2018/07/29 16:45 | Austin Hussey v Ruan Roelofse | 1-6,1-6 |