Round: 54 Ground: Clay
| ITF Poland F5 | 2015/09/07 11:50 | Krstev, Ondrej v Onken, Julian | 6-2,5-7,6-3 |
| ITF Poland F4 Qual | 2015/08/31 09:30 | Jedruszczak, Mikolaj v Onken, Julian | 7-5,6-0 |
| ITF Poland F4 Qual | 2015/08/30 07:30 | Nazaruk, Dominik v Onken, Julian | 2-6,0-6 |
| ITF Germany F12 | 2015/08/20 13:10 | Onken, Julian v Manafov, Vladyslav | 4-6,1-6 |
| ITF Germany F12 | 2015/08/19 11:00 | Onken, Julian v Vibert, Francois Arthur | 6-3,0-6,7-6 |
| ITF Germany F11 | 2015/08/13 15:00 | Fallert, Florian v Onken, Julian | 6-4,3-6,6-0 |
| ITF Germany F11 | 2015/08/09 07:30 | Onken, Julian v Wright, Thomas | 6-4,6-2 |
| ITF Germany F9 | 2015/07/29 15:25 | Onken, Julian v Geens, Clement | 3-6,1-6 |
| ITF Italy F31 Qual | 2015/10/11 08:00 | Giovanni Fonio v Krohn, Linus | 6-3,6-4 |
| ITF Italy F30 | 2015/10/06 11:25 | Giovanni Fonio v Basso, Andrea | 0-6,2-6 |
| ITF Italy F30 | 2015/10/04 08:00 | Cammarata, Alberto v Giovanni Fonio | 5-7,6-4,4-6 |
| ITF Italy F30 | 2015/10/03 09:30 | Speziali, Maurizio v Giovanni Fonio | 1-6,0-6 |
| ITF Italy F28 Qual | 2015/09/20 08:00 | Mazzella, Manuel v Giovanni Fonio | 6-3,6-7,6-2 |
| ITF Italy F27 Qual | 2015/09/13 07:30 | Mazzella, Manuel v Giovanni Fonio | 7-6,6-7,6-4 |
| ITF Italy F27 Qual | 2015/09/12 07:30 | Giovanni Fonio v Moncagatto, Francesco | 4-6,6-3,6-3 |
| ITF Italy F26 | 2015/09/08 07:30 | Giovanni Fonio v Leonardi, Filippo | 5-7,4-6 |