Stadium: Court 3 Round: 46 Ground: Hardcourt outdoor
| Challenger Las Vegas | 2018/10/20 20:45 | Alex Rybakov v Alejandro Gonzalez | 6-2,7-6 |
| Challenger Fairfield | 2018/10/09 17:00 | Alex Rybakov v Maxime Janvier | 6-7,3-6 |
| Challenger Cary | 2018/09/09 16:15 | Alex Rybakov v Joris De Loore | 1-6,2-6 |
| Challenger Cary | 2018/09/08 14:00 | Blaine Boyden v Alex Rybakov | 1-6,3-6 |
| Challenger Aptos | 2018/08/04 17:20 | Ruan Roelofse v Alex Rybakov | 3-6,6-7 |
| Challenger Lexington | 2018/07/31 20:55 | Alex Rybakov v Stefano Napolitano | 4-6,3-6 |
| Challenger Lexington Qual | 2018/07/30 16:00 | Alex Rybakov v Ruan Roelofse | 7-5,7-6 |
| Challenger Lexington Qual | 2018/07/29 16:30 | Alex Rybakov v Strong Kirchheimer | 4-6,7-5,6-3 |
| Challenger Las Vegas | 2018/10/20 20:00 | Lucas Gomez v Roberto Ortega-Olmedo | 2-6,7-5,0-6 |
| Challenger Calgary | 2018/10/15 20:05 | Enzo Couacaud v Roberto Ortega-Olmedo | 6-2,4-6,6-3 |
| Challenger Fairfield | 2018/10/06 22:15 | Frederik Nielsen v Roberto Ortega-Olmedo | 6-2,6-2 |
| Challenger Stockton | 2018/09/29 17:00 | Roberto Ortega-Olmedo v Marcos Giron | 4-6,4-6 |
| Challenger Tiburon | 2018/09/25 21:55 | Ernesto Escobedo v Roberto Ortega-Olmedo | 6-1,7-6 |
| Challenger Tiburon | 2018/09/24 17:00 | Jan Choinski v Roberto Ortega-Olmedo | 6-7,3-6 |
| Challenger Tiburon | 2018/09/23 17:00 | Marcos Giron v Roberto Ortega-Olmedo | 3-6,6-1,5-7 |
| Challenger Tiburon | 2018/09/22 17:00 | Sebastian Fanselow v Roberto Ortega-Olmedo | 1-6,2-6 |