Stadium: Indoor 10 Round: 54 Ground: Hardcourt outdoor
| 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 |
| Challenger Lexington Qual | 2018/07/28 18:55 | Ruan Roelofse v Kento Takeuchi | 6-4,6-4 |
| Challenger Binghamton Qual | 2018/07/21 17:20 | Ruan Roelofse v Jared Hiltzik | 5-7,4-6 |
| 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 - Granby | 2018/07/28 03:00 | Alexander Sarkissian v Frank Dancevic | 6-1,2-6,4-6 |
| Challenger - Granby | 2018/07/27 00:05 | Filip Peliwo v Alexander Sarkissian | 4-6,3-6 |
| Challenger - Granby | 2018/07/23 23:35 | Bradley Mousley v Alexander Sarkissian | 6-3,6-7,4-6 |