Stadium: Court 4 Round: 62 Ground: Hardcourt outdoor
| Challenger Puerto Vallarta Qual | 2018/04/28 18:15 | Merino, Alexander v Boris Arias | 6-3,4-6,2-6 |
| ITF Tunisia F12 | 2018/03/28 08:30 | Merino, Alexander v Munoz-Abreu, Jordi | 3-6,1-6 |
| ITF Tunisia F11 | 2018/03/18 08:30 | Merino, Alexander v Catini, Daniele | 7-5,5-7,3-6 |
| ITF Tunisia F11 | 2018/03/17 08:00 | Merino, Alexander v Gonzalez Paiva, Juan Mauricio | 6-1,6-0 |
| Tunisia F10, Singles Qualifying | 2018/03/14 14:20 | Roncalli, Simone v Merino, Alexander | 6-4,6-0 |
| Tunisia F10, Singles Qualifying | 2018/03/10 08:30 | Gabriele Maria Noce v Merino, Alexander | 4-6,3-6 |
| ITF Tunisia F9 | 2018/03/03 10:30 | Merino, Alexander v Mcdaniels, Mitchell Thomas | 4-6,3-6 |
| ITF Tunisia F8 | 2018/02/25 11:00 | Lamberti, Edoardo v Merino, Alexander | 3-6,6-4,6-4 |
| ITF Mexico F1 | 2018/05/05 16:00 | Sepulveda, Marcelo v Mcmann, Conner | 4-6,6-3,6-1 |
| Puerto Vallarta, Mexico | 2018/05/01 00:45 | Sepulveda, Marcelo v Giraldo, Santiago | 2-6,0-6 |
| ITF USA F12 | 2018/04/22 17:00 | Sepulveda, Marcelo v Bradley, Julian | 6-7,7-6,3-6 |
| ITF USA F12 | 2018/04/20 12:00 | Sepulveda, Marcelo v Liu, Yang | 6-2,6-2 |
| ITF USA F11 | 2018/04/16 14:00 | Haworth, Christopher G v Sepulveda, Marcelo | 4-6,6-1,6-4 |
| ITF USA F11 | 2018/04/15 12:00 | Sullivan, Charles v Sepulveda, Marcelo | 2-6,3-6 |
| ITF USA F10 Qual | 2018/04/08 17:30 | Alexander Ritschard v Sepulveda, Marcelo | 6-3,6-0 |
| ITF USA F3 Qual | 2018/01/07 16:00 | Bryde, Trent v Sepulveda, Marcelo | 6-4,7-5 |