Stadium: Court 3 Round: 25 Ground: Clay
| Challenger Braunschweig Qual | 2018/07/07 11:20 | Maxime Janvier v Felipe Mantilla | 6-2,6-2 |
| Challenger Braunschweig Qual | 2018/07/07 07:30 | Matthew Dellavedova v Felipe Mantilla | 2-6,2-6 |
| Challenger Marburg Qual | 2018/06/30 16:40 | Felipe Mantilla v Cristian Rodriguez | 3-6,2-6 |
| ITF USA F15 | 2018/06/19 16:05 | Marcos Giron v Felipe Mantilla | 6-1,7-6 |
| ITF USA F13 | 2018/06/14 18:00 | Brian Shi v Felipe Mantilla | 6-4,2-6,6-4 |
| ITF USA F13 | 2018/06/13 16:05 | Felipe Mantilla v JC Aragone | 6-3,6-7,7-6 |
| ITF Mexico F2 | 2018/05/15 22:30 | Felipe Mantilla v Gerardo L Villasenor | 6-4,5-7,6-7 |
| ITF Mexico F1 | 2018/05/07 18:00 | Felipe Mantilla v Junior Alexander Ore | 6-7,2-6 |
| ITF Netherlands F4 | 2018/08/13 10:00 | Maikel Borg v Alexander Merino | 6-1,6-1 |
| ITF Netherlands F4 | 2018/08/12 12:00 | Lucas Hellfritsch v Alexander Merino | 4-6,3-6 |
| ITF Germany F11 | 2018/08/07 11:40 | Leonard Von Hindte v Alexander Merino | 6-3,6-2 |
| ITF Germany F11 | 2018/08/06 13:00 | Chris Rodesch v Alexander Merino | 7-5,6-4 |
| ITF Germany F11 | 2018/08/05 12:00 | Marlon Vankan v Alexander Merino | 1-6,6-4,2-6 |
| ITF Germany F11 | 2018/08/05 10:00 | Arpit Sharma v Alexander Merino | 3-6,3-6 |
| ITF Georgia F1 | 2018/07/08 07:00 | Alexander Merino v Oleg Besednikov | 5-7,3-6 |
| ITF Mexico F3 | 2018/05/21 17:00 | Alexander Merino v Edward Bourchier | 6-7,6-3,3-6 |