Stadium: Court 6 Round: 24 Ground: Hardcourt outdoor
| Challenger Buenos Aires | 2018/11/16 18:10 | Guilherme Clezar v Federico Coria | 6-7,5-7 |
| Challenger Buenos Aires | 2018/11/15 17:00 | Martin Cuevas v Guilherme Clezar | 4-6,1-6 |
| Challenger Buenos Aires | 2018/11/12 16:05 | Miljan Zekic v Guilherme Clezar | 3-6,2-6 |
| Challenger Montevideo | 2018/11/06 19:45 | Guilherme Clezar v Pedro Sousa | 1-6,2-6 |
| Challenger Guayaquil | 2018/10/30 15:30 | Facundo Arguello v Guilherme Clezar | 4-6,6-2,6-1 |
| Challenger Lima | 2018/10/24 16:00 | Guilherme Clezar v Cristian Garin | 3-6,3-6 |
| Challenger Lima | 2018/10/22 17:55 | Guilherme Clezar v Kento Tagashira | 6-0,6-0 |
| Challenger Campinas | 2018/10/03 00:05 | Guilherme Clezar v Cristian Garin | 7-6,6-7,4-6 |
| Challenger Champaign | 2018/11/13 16:00 | Harri Heliovaara v Mikael Torpegaard | 3-6,7-5,6-4 |
| Challenger Charlottesville | 2018/10/27 14:00 | Marcos Giron v Harri Heliovaara | 3-6,6-1,6-1 |
| Challenger Stockton | 2018/10/01 17:00 | Harri Heliovaara v Alexander Sarkissian | 6-4,4-6,4-6 |
| Challenger Stockton | 2018/09/30 19:35 | Harri Heliovaara v Sem Verbeek | 6-1,6-4 |
| Challenger Stockton | 2018/09/29 20:30 | Harri Heliovaara v Ruan Roelofse | 7-6,6-1 |
| Challenger Tiburon | 2018/09/22 21:55 | Renzo Olivo v Harri Heliovaara | 6-2,3-6,7-6 |
| Davis Cup | 2018/09/15 09:40 | Mohamed Safwat v Harri Heliovaara | 6-2,6-4 |
| Davis Cup | 2018/09/14 11:25 | Karim-Mohamed Maamoun v Harri Heliovaara | 3-6,2-6 |