Stadium: Court 20 Round: 25 Ground: Clay
| Challenger Guayaquil Qual | 2018/10/27 20:50 | Mantilla, Felipe v Neis, Fabricio | 4-6,6-4,4-6 |
| Challenger Lima | 2018/10/20 16:45 | Malla, Bastian v Mantilla, Felipe | 6-2,6-4 |
| Santo Domingo, Dominican Republic | 2018/10/07 18:25 | Mantilla, Felipe v Federico Coria | 5-7,6-7 |
| Santo Domingo, Dominican Republic | 2018/10/06 17:20 | Segarelli, Emilio Andrea v Mantilla, Felipe | 3-6,1-6 |
| Monterrey, Mexico | 2018/09/29 17:35 | Mantilla, Felipe v Harrison Adams | 2-6,5-7 |
| ITF Netherlands F6 | 2018/08/31 09:00 | Kocevar-Desman, Tom v Mantilla, Felipe | 3-6,7-6,6-4 |
| ITF Netherlands F6 | 2018/08/30 08:00 | Veldheer, Mick v Mantilla, Felipe | 3-6,1-6 |
| ITF Netherlands F6 | 2018/08/29 11:00 | Richmond, John Harrison v Mantilla, Felipe | 3-6,1-6 |
| ITF USA F29 | 2018/11/02 19:15 | Butsch, Justin v Filip Cristian Jianu | 5-7,6-4,6-2 |
| ITF USA F29 | 2018/11/01 22:30 | Filip Cristian Jianu v Riffice, Sam | 7-5,4-6,6-3 |
| ITF USA F29 | 2018/10/31 15:00 | Filip Cristian Jianu v Baudry, Simon | 6-2,6-2 |
| ITF Romania F10 | 2018/08/22 11:35 | Ghilea, Vasile-Alexandru v Filip Cristian Jianu | 6-4,6-1 |
| ITF Romania F9 | 2018/08/14 07:00 | Tchoutakian, Maxime v Filip Cristian Jianu | 6-3,3-6,7-5 |
| ITF Romania F9 | 2018/08/13 06:00 | Filip Cristian Jianu v Tatomir, Luca Georg | 6-2,6-3 |
| ITF Romania F9 | 2018/08/12 06:00 | Filip Cristian Jianu v Mandocescu, Laurentiu | 7-6,6-2 |
| ITF Romania F2 | 2018/06/01 08:00 | Filip Cristian Jianu v Escobar, Gonzalo | 7-6,0-6,4-6 |