Stadium: Court 1 Round: 45 Ground: Hardcourt outdoor
| 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 Lexington Qual | 2018/07/28 16:40 | Alex Rybakov v Julian Bradley | 6-1,6-3 |
| Challenger Calgary | 2018/10/16 19:20 | Alejandro Gonzalez v Casper Ruud | 6-3,5-7,6-7 |
| Challenger Campinas | 2018/10/04 15:00 | Alejandro Gonzalez v Cristian Garin | 3-6,1-6 |
| Challenger Campinas | 2018/10/02 13:00 | Alejandro Gonzalez v Facundo Arguello | 6-3,7-6 |
| Challenger Tiburon | 2018/09/23 17:00 | Alejandro Gonzalez v Pablo Vivero Gonzalez | 3-6,1-6 |
| Challenger Tiburon | 2018/09/22 18:50 | Alexander Ritschard v Alejandro Gonzalez | 1-6,4-6 |
| Challenger Columbus | 2018/09/18 17:55 | Luke Saville v Alejandro Gonzalez | 7-5,6-4 |
| Challenger Cary | 2018/09/13 19:40 | Alejandro Gonzalez v Bjorn Fratangelo | 7-6,5-7,4-6 |
| Challenger Cary | 2018/09/12 17:00 | Alejandro Gonzalez v Mikael Ymer | 4-6,6-3,6-4 |