Stadium: Court 5 Round: 25 Ground: Clay
| ITF Bosnia and Herzegovina F1 | 2018/05/16 12:30 | Onishi, Ken v Zgombic, Fran Zvonimir | 6-2,3-6,4-6 |
| ITF Turkey F13 | 2018/04/01 08:30 | Onishi, Ken v Soares Klier, Gilbert | 3-6,6-7 |
| ITF Turkey F13 | 2018/03/31 08:30 | Onishi, Ken v Kerdlaphee, Phongsapak | 6-4,6-2 |
| ITF Tunisia F9 | 2018/03/07 11:05 | Onishi, Ken v Brechemier, Thomas | 6-4,6-7,6-7 |
| ITF Tunisia F8 | 2018/02/28 11:20 | Ghorbel, Anis v Onishi, Ken | 6-4,1-6,6-2 |
| ITF Tunisia F7 | 2018/02/22 08:30 | Onishi, Ken v Tatlot, Johan Sebastien | 4-6,3-6 |
| ITF Tunisia F7 | 2018/02/20 09:00 | Onishi, Ken v Hovhannisyan, Mousheg | 4-6,7-6,6-0 |
| Launceston, Australia | 2018/02/04 00:25 | Matosevic, Marinko v Onishi, Ken | 6-4,6-0 |
| ITF Hungary F3 Qual | 2018/05/21 07:55 | Maruscak, Matej v Maxim Krapivin | 6-3,6-3 |
| ITF Hungary F3 Qual | 2018/05/20 08:00 | Lazar Vojinovic v Maruscak, Matej | 3-6,3-6 |
| ITF Hungary F2 | 2018/05/15 14:40 | Safranek, Vaclav v Maruscak, Matej | 7-5,1-6,6-4 |
| ITF Hungary F2 Qual | 2018/05/14 11:00 | Maruscak, Matej v Ilic, Marko | 6-3,6-2 |
| ITF Hungary F2 Qual | 2018/05/13 08:00 | Godry, Levente v Maruscak, Matej | 3-6,6-7 |
| ITF Hungary F2 Qual | 2018/05/12 08:00 | Kis Balazs, Rafael v Maruscak, Matej | 1-6,4-6 |
| ITF Greece F2 | 2018/03/07 10:00 | Maruscak, Matej v Jankovits, Yannick | 3-6,6-7 |
| ITF Greece F2 | 2018/03/05 07:30 | Duje Ajdukovic v Maruscak, Matej | 3-6,7-5,1-6 |