Stadium: Stadium Round: 25 Ground: Hardcourt outdoor
| Challenger Jerusalem | 2019/05/22 07:00 | Edan Leshem v Collin Altamirano | 1-6,6-1,6-4 |
| Challenger Savannah | 2019/05/01 18:15 | Noah Rubin v Collin Altamirano | 6-2,2-6,2-6 |
| Challenger Savannah | 2019/04/29 17:25 | Collin Altamirano v Alen Avidzba | 6-0,7-6 |
| Challenger Tallahassee | 2019/04/24 16:30 | Collin Altamirano v Nino Serdarusic | 3-6,6-2,6-7 |
| Challenger Tallahassee | 2019/04/22 18:05 | Ryan Shane v Collin Altamirano | 4-6,6-7 |
| Challenger Sarasota | 2019/04/16 19:30 | Peter Polansky v Collin Altamirano | 6-1,6-4 |
| Challenger Sarasota | 2019/04/15 19:45 | Evgeny Karlovskiy v Collin Altamirano | 7-6,4-6,4-6 |
| Challenger Taipei | 2019/04/08 09:40 | Collin Altamirano v Chien Hsun Lo | 5-7,7-5,3-6 |
| Challenger Little Rock | 2019/06/03 18:00 | Alexander Sarkissian v Brandon Holt | 6-2,5-7,6-4 |
| Challenger Puerto Vallarta | 2019/05/02 21:10 | Alejandro Tabilo v Alexander Sarkissian | 6-0,6-2 |
| Challenger Puerto Vallarta | 2019/05/01 18:00 | Alexander Sarkissian v Donald Young | 1-6,7-6,6-2 |
| Challenger Puerto Vallarta | 2019/04/29 17:10 | Alexander Sarkissian v Evan Song | 4-6,7-6,6-1 |
| Challenger Leon | 2019/04/23 19:20 | Marcelo Arevalo v Alexander Sarkissian | 6-7,7-5,7-6 |
| Challenger Leon | 2019/04/22 17:30 | Luis Patino v Alexander Sarkissian | 1-6,2-6 |
| Challenger Indian Wells | 2019/02/25 18:00 | Alexander Sarkissian v Michael Redlicki | 3-6,3-6 |
| Challenger Dallas | 2019/02/04 20:20 | Mario Vilella Martinez v Alexander Sarkissian | 6-4,6-4 |