Stadium: Court 2 Round: 46 Ground: Hardcourt indoor
| Challenger Knoxville | 2018/11/04 22:45 | Lammons, Nathaniel v Nguyen, Daniel | 6-4,3-6,6-4 |
| Challenger Charlottesville | 2018/10/27 18:30 | Ymer, Mikael v Nguyen, Daniel | 3-6,6-2,6-4 |
| Challenger Las Vegas | 2018/10/20 17:00 | Nguyen, Daniel v Thai-Son Kwiatkowski | 2-6,3-6 |
| Challenger Fairfield | 2018/10/07 18:20 | King, Kevin v Nguyen, Daniel | 6-2,6-0 |
| Challenger Fairfield | 2018/10/06 21:30 | Nguyen, Daniel v Kelly, Dayne | 6-3,7-5 |
| Challenger Stockton | 2018/09/29 22:00 | Nguyen, Daniel v Harris, Andrew | 0-6,4-6 |
| Challenger Tiburon | 2018/09/22 20:15 | Nguyen, Daniel v Hiltzik, Jared | 4-6,7-6,1-6 |
| ITF Japan F2 | 2018/03/18 02:00 | Nguyen, Daniel v Tung-Lin Wu | 6-7,7-6,7-6 |
| Challenger Stockton | 2018/09/29 20:30 | Heliovaara, Harri v Roelofse, Ruan | 7-6,6-1 |
| Challenger Columbus | 2018/09/15 15:20 | Fawcett, Tom v Roelofse, Ruan | 6-3,6-4 |
| Challenger Cary | 2018/09/08 15:20 | Sarkissian, Alexander v Roelofse, Ruan | 6-4,6-3 |
| Challenger Chicago | 2018/09/05 17:00 | Tommy Paul v Roelofse, Ruan | 6-3,6-2 |
| Challenger Chicago | 2018/09/03 22:20 | Roelofse, Ruan v Sarkissian, Alexander | 3-6,4-6 |
| 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 |