Round: 27 Ground: Clay
| ITF Italy F21 | 2015/08/05 09:55 | Collin Altamirano v Daniel Masur | 6-2,6-2 |
| ITF Italy F21 | 2015/08/04 12:35 | Maximilian Marterer v Collin Altamirano | 5-7,4-6 |
| ITF Italy F20 | 2015/07/27 12:00 | Collin Altamirano v Fabio Mercuri | 6-7,7-6,1-6 |
| ITF Italy F17 | 2015/07/07 15:00 | Collin Altamirano v Stefano Travaglia | 2-6,6-7 |
| US Open Qual | 2014/08/21 23:00 | Ricardas Berankis v Collin Altamirano | 2-6,6-1,6-1 |
| US Open Qual | 2014/08/20 15:00 | Luca Vanni v Collin Altamirano | 4-6,2-6 |
| ITF USA F19 Qual | 2014/06/30 15:00 | Collin Altamirano v Francisco Dias | 7-6,6-3 |
| ITF USA F17 | 2014/06/27 15:00 | Collin Altamirano v Jared Donaldson | 2-6,1-6 |
| ITF Italy F21 | 2015/08/05 08:00 | Andres Gabriel Ciurletti v Omar Giacalone | 3-6,1-6 |
| ITF Italy F21 | 2015/08/04 09:00 | Marco Mosciatti v Omar Giacalone | 2-6,2-6 |
| Challenger Padova | 2015/07/01 11:00 | Hans Podlipnik-Castillo v Omar Giacalone | 6-4,6-2 |
| ITF Italy F15 | 2015/06/23 13:15 | Joao Domingues v Omar Giacalone | 6-3,6-3 |
| ITF Italy F14 | 2015/06/18 15:10 | Mateo Nicolas Martinez v Omar Giacalone | 4-6,3-6 |
| ITF Italy F14 | 2015/06/17 14:55 | Filippo Borella v Omar Giacalone | 0-6,2-6 |
| ITF Italy F14 | 2015/06/16 08:00 | Eduard Esteve Lobato v Omar Giacalone | 4-6,6-2,3-6 |
| ITF Italy F11 | 2015/05/28 11:00 | Omar Giacalone v Tommy Paul | 3-6,3-6 |