Stadium: Indoor 10 Round: 54 Ground: Hardcourt outdoor
| Challenger Chicago | 2018/09/02 22:10 | Gonzalez, Alejandro v Roelofse, Ruan | 4-6,6-3,3-6 |
| Challenger Chicago | 2018/09/02 17:45 | Fawcett, Tom v Roelofse, Ruan | 5-7,4-6 |
| Vancouver, Canada | 2018/08/11 18:20 | Roelofse, Ruan v Grills, Jacob | 1-6,2-6 |
| Challenger Aptos | 2018/08/04 17:20 | Roelofse, Ruan v Alex Rybakov | 3-6,6-7 |
| Challenger Lexington Qual | 2018/07/30 16:00 | Alex Rybakov v Roelofse, Ruan | 7-5,7-6 |
| Challenger Lexington Qual | 2018/07/29 16:45 | Hussey, Austin v Roelofse, Ruan | 1-6,1-6 |
| Challenger Lexington Qual | 2018/07/28 18:55 | Roelofse, Ruan v Takeuchi, Kento (1987) | 6-4,6-4 |
| Challenger Binghamton Qual | 2018/07/21 17:20 | Roelofse, Ruan v Hiltzik, Jared | 5-7,4-6 |
| Challenger Chicago | 2018/09/02 21:35 | Hiltzik, Aron v Sarkissian, Alexander | 1-6,2-6 |
| Challenger Chicago | 2018/09/02 16:40 | Aleksandar Vukic v Sarkissian, Alexander | 3-6,4-6 |
| Vancouver, Canada | 2018/08/13 19:00 | Gojo, Borna v Sarkissian, Alexander | 7-6,6-4 |
| Challenger Aptos | 2018/08/05 17:00 | Sarkissian, Alexander v Aleksandar Vukic | 5-7,2-6 |
| Challenger Aptos | 2018/08/04 18:45 | Sarkissian, Alexander v Smith, Logan | 3-6,6-3,6-2 |
| Challenger Granby | 2018/07/28 03:00 | Sarkissian, Alexander v Dancevic, Frank | 6-1,2-6,4-6 |
| Challenger Granby | 2018/07/27 00:05 | Filip Peliwo v Sarkissian, Alexander | 4-6,3-6 |
| Challenger Granby | 2018/07/23 23:35 | Mousley, Bradley v Sarkissian, Alexander | 6-3,6-7,4-6 |