Stadium: C Round: 46 Ground: Hardcourt outdoor
| Challenger Fairfield Qual | 2017/10/09 17:00 | Alejandro Gonzalez v Ruan Roelofse | 6-7,2-6 |
| Challenger Astana | 2018/07/17 05:55 | Mikhail Youzhny v Alejandro Gonzalez | 6-3,2-6,7-5 |
| Challenger Perugia Qual | 2018/07/08 08:00 | Alejandro Gonzalez v Pol Toledo Bague | 2-6,7-5,3-6 |
| Challenger Recanati Qual | 2018/07/02 10:00 | Alejandro Gonzalez v Andrea Basso | 2-6,3-6 |
| Challenger Recanati Qual | 2018/07/01 11:30 | Alejandro Gonzalez v Francesco Ferrari | 6-3,7-5 |
| Challenger Recanati Qual | 2018/06/30 14:45 | Alejandro Gonzalez v Vasko Mladenov | 6-4,6-3 |
| Challenger Milan Qual | 2018/06/23 10:20 | Alejandro Gonzalez v Christian Lindell | 3-6,6-2,2-6 |
| Challenger L'Aquila | 2018/06/19 09:40 | Alejandro Gonzalez v Gianluca Mager | 3-6,3-6 |
| Challenger Vicenza Qual | 2018/05/26 10:10 | Juan Ignacio Galarza v Alejandro Gonzalez | 6-3,6-4 |
| 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 Puerto Vallarta Qual | 2018/04/28 19:25 | Jose Olivares v Ruan Roelofse | 6-3,7-5 |