Stadium: Campo 3 Round: 27 Ground: Clay
| Challenger Mestre | 2018/05/24 11:15 | Marcora, Roberto v Guttierrez-Ferrol, Sergio | 5-7,4-6 |
| Challenger Mestre | 2018/05/23 14:55 | Guttierrez-Ferrol, Sergio v Zekic, Miljan | 6-1,7-5 |
| ITF Spain F11 | 2018/05/19 09:00 | Guttierrez-Ferrol, Sergio v Salman, Omar | 3-6,5-7 |
| ITF Spain F11 | 2018/05/18 09:00 | Guttierrez-Ferrol, Sergio v Sebastian Korda | 6-7,6-1,6-3 |
| ITF Spain F11 | 2018/05/17 12:25 | Guttierrez-Ferrol, Sergio v Mikhail Korovin | 6-2,6-2 |
| ITF Spain F11 | 2018/05/16 13:20 | Guttierrez-Ferrol, Sergio v Andrey Chepelev | 6-2,6-3 |
| Challenger Braga | 2018/05/11 13:00 | Gastao Elias v Guttierrez-Ferrol, Sergio | 6-3,6-2 |
| Challenger Braga | 2018/05/09 11:00 | Guttierrez-Ferrol, Sergio v Gleb Sakharov | 6-3,6-4 |
| Challenger Mestre | 2018/05/24 09:30 | Griekspoor, Scott v Petrovic, Danilo | 7-6,6-7,1-6 |
| Challenger Mestre | 2018/05/21 12:10 | Basso, Andrea v Petrovic, Danilo | 6-2,1-6,3-6 |
| Puerto Vallarta, Mexico | 2018/05/05 23:00 | Menendez-Maceiras, Adrian v Petrovic, Danilo | 1-6,7-5,6-3 |
| Puerto Vallarta, Mexico | 2018/05/04 23:00 | Petrovic, Danilo v Gomez-Herrera, Carlos | 6-3,6-3 |
| Puerto Vallarta, Mexico | 2018/05/03 21:00 | Petrovic, Danilo v Pavic, Ante | 6-3,6-2 |
| Puerto Vallarta, Mexico | 2018/05/02 19:00 | Petrovic, Danilo v Ugo Humbert | 6-4,3-6,6-3 |
| Puerto Vallarta, Mexico | 2018/05/01 18:35 | Petrovic, Danilo v Escobar, Gonzalo | 6-3,1-6,6-2 |
| Challenger Leon | 2018/04/24 17:45 | Hernandez-Fernandez, Jose v Petrovic, Danilo | 6-3,4-6,6-4 |