Stadium: Clay 8 Round: 62 Ground: Clay
| ITF Turkey F30 | 2018/09/29 11:00 | Konings, Ruben v Ontica, Cosmin | 6-4,6-1 |
| ITF Turkey F30 | 2018/09/29 11:00 | Konings, Ruben v Ontica, Cosmin | 6-4,6-1 |
| Challenger Sibiu | 2018/09/15 08:00 | Bothwell, Peter v Ontica, Cosmin | 6-3,7-5 |
| ITF Romania F12 | 2018/09/01 10:00 | Ontica, Cosmin v Kurita, Kenta | 4-6,4-6 |
| ITF Romania F11 | 2018/08/26 13:00 | Filip, Vladimir v Ontica, Cosmin | 7-5,6-4 |
| ITF Romania F11 | 2018/08/25 08:00 | Savin, Robert Damian v Ontica, Cosmin | 2-6,1-6 |
| ITF Romania F10 | 2018/08/19 10:30 | Ontica, Cosmin v Cornea, Vlad Victor | 5-7,6-7 |
| ITF Romania F10 | 2018/08/18 10:00 | Ontica, Cosmin v Stroe, Alexandru Ionel | 6-1,6-1 |
| ITF Romania F9 | 2018/08/12 08:30 | Ontica, Cosmin v Luncanu, Petru-Alexandru | 3-6,2-6 |
| ITF Turkey F30 | 2018/10/03 07:00 | Cengiz Aksu v Konings, Ruben | 6-0,6-1 |
| ITF Turkey F30 | 2018/10/01 07:30 | Konings, Ruben v Noah Thurner | 6-1,6-2 |
| ITF Turkey F30 | 2018/09/30 10:30 | Konings, Ruben v Thiem, Moritz | 7-6,6-2 |
| ITF Turkey F30 | 2018/09/29 11:00 | Konings, Ruben v Ontica, Cosmin | 6-4,6-1 |
| ITF Netherlands F6 | 2018/08/28 09:50 | Veldheer, Mick v Konings, Ruben | 6-3,7-6 |
| ITF Netherlands F5 | 2018/08/21 12:20 | Dijkhuizen, Marc v Konings, Ruben | 6-2,6-1 |
| ITF Netherlands F5 | 2018/08/19 10:00 | Konings, Ruben v van Baal, Aloys Johannes Willem | 6-3,6-7,7-6 |
| ITF Netherlands F5 | 2018/08/18 08:00 | Konings, Ruben v van Der Horst, Tim | 6-2,6-2 |