Stadium: Court 1 Round: 25 Ground: Clay
| Challenger - Braga | 2018/05/07 13:30 | Lorenzo Giustino v Scott Griekspoor | 4-6,6-3,6-3 |
| Challenger Mestre | 2018/05/24 09:30 | Scott Griekspoor v Danilo Petrovic | 7-6,6-7,1-6 |
| Challenger Mestre | 2018/05/21 12:10 | Daniel Munoz-De La Nava v Scott Griekspoor | 1-6,2-6 |
| Challenger - Braga | 2018/05/07 13:30 | Lorenzo Giustino v Scott Griekspoor | 4-6,6-3,6-3 |
| Challenger Guadalajara Qual | 2018/04/15 16:00 | Scott Griekspoor v Jose Olivares | 6-3,7-5 |
| Challenger Guadalajara Qual | 2018/04/14 15:00 | Scott Griekspoor v Nicolas Barrientos | 6-4,7-6 |
| ITF USA F10 | 2018/04/11 15:00 | Collin Altamirano v Scott Griekspoor | 7-6,6-3 |
| ITF USA F9 | 2018/04/08 17:10 | Scott Griekspoor v Sebastian Fanselow | 6-7,6-4,7-5 |
| ITF USA F9 | 2018/04/08 15:00 | Scott Griekspoor v Henry Craig | 7-5,7-5 |
| Challenger - Shymkent | 2018/06/08 08:00 | Yannick Hanfmann v Lorenzo Giustino | 6-1,6-0 |
| Challenger - Shymkent | 2018/06/07 07:30 | Lorenzo Giustino v Kevin Krawietz | 7-5,4-6,6-3 |
| Challenger - Shymkent | 2018/06/06 08:10 | Mohamed Safwat v Lorenzo Giustino | 4-6,7-6,4-6 |
| Challenger Mestre | 2018/05/25 13:50 | Lorenzo Giustino v Gianluigi Quinzi | 6-2,6-7,3-6 |
| Challenger Mestre | 2018/05/24 09:00 | Lorenzo Giustino v Liam Caruana | 6-1,6-1 |
| Challenger Mestre | 2018/05/21 13:25 | Lorenzo Giustino v Carlos Gomez-Herrera | 7-5,6-4 |
| Challenger - Lissabon | 2018/05/17 16:50 | Pedro Sousa v Lorenzo Giustino | 6-2,6-0 |
| Challenger - Lissabon | 2018/05/15 17:05 | Lorenzo Giustino v Joris De Loore | 7-5,1-6,7-6 |