Stadium: Stadium Court Round: 25 Ground: Clay
| Challenger Guayaquil | 2018/11/03 01:00 | Guido Andreozzi v Santiago Giraldo | 6-4,7-6 |
| Challenger Guayaquil | 2018/11/02 01:10 | Juan Ignacio Londero v Santiago Giraldo | 7-5,6-7,6-7 |
| Challenger Guayaquil | 2018/10/31 16:00 | Santiago Giraldo v Miljan Zekic | 7-5,7-5 |
| Challenger Guayaquil | 2018/10/29 19:15 | Santiago Giraldo v Joao Domingues | 7-5,6-3 |
| Challenger Lima | 2018/10/22 20:20 | Thiago Monteiro v Santiago Giraldo | 1-6,6-2,7-5 |
| Challenger Santo Domingo | 2018/10/11 14:00 | Santiago Giraldo v Carlos Berlocq | 6-7,6-7 |
| Challenger Santo Domingo | 2018/10/10 02:20 | Pablo Cuevas v Santiago Giraldo | 6-7,6-2,3-6 |
| Challenger Monterrey | 2018/10/06 19:00 | Ivo Karlovic v Santiago Giraldo | 6-7,6-4,7-6 |
| Challenger Houston | 2018/11/19 01:00 | Roy Smith v Bradley Klahn | 6-7,6-7 |
| Challenger Houston | 2018/11/17 17:45 | Dominik Koepfer v Bradley Klahn | 3-6,4-6 |
| Challenger Houston | 2018/11/16 20:45 | Evan Song v Bradley Klahn | 3-6,6-4,1-6 |
| Challenger Houston | 2018/11/15 22:10 | Michael Redlicki v Bradley Klahn | 4-6,4-6 |
| Challenger Houston | 2018/11/13 18:10 | Alexander Sarkissian v Bradley Klahn | 1-6,2-6 |
| Challenger Knoxville | 2018/11/08 16:55 | Evgeny Karlovskiy v Bradley Klahn | 5-7,6-4,6-4 |
| Challenger Knoxville | 2018/11/06 20:50 | JC Aragone v Bradley Klahn | 2-6,6-7 |
| Challenger Charlottesville | 2018/11/03 18:40 | Bradley Klahn v Tommy Paul | 3-6,3-6 |