Round: 26 Ground: Clay
| Challenger Heilbronn - MP | 2018/05/18 14:00 | Niesten/Sijsling v Junaid/Pel | 4-6,1-6 |
| Challenger Heilbronn - MP | 2018/05/16 13:05 | Middelkoop/Molteni v Niesten/Sijsling | 7-5,6-7,9-11 |
| ITF Portugal F8 MD | 2018/04/20 14:05 | Niesten/Sijsling v Gigounon/Lamasine | 5-7,7-5,7-10 |
| ITF Portugal F8 MD | 2018/04/19 15:30 | Niesten/Sijsling v Doumbia/Reboul | 6-2,2-6,10-7 |
| ITF Portugal F8 MD | 2018/04/17 12:45 | Kolotvin/Semedo v Niesten/Sijsling | 1-6,2-6 |
| ITF Portugal F7 MD | 2018/04/13 13:00 | Niesten/Sijsling v Cabral/Cacao | 3-6,6-2,2-10 |
| Challenger Bastad MD | 2018/07/13 13:00 | Kolar/Oliveira v Gonzales/Lammons | 6-7,6-4,10-7 |
| Challenger Bastad MD | 2018/07/11 15:15 | Gonzales/Lammons v Pasha/Reese | 3-6,6-3,10-5 |
| Challenger Bastad MD | 2018/07/09 14:55 | Gonzales/Lammons v Eriksson/Siljestrom | 3-6,6-3,10-6 |
| Challenger Recanati MD | 2018/07/04 12:00 | Gonzales/Lammons v Escobar/Romboli | 6-1,3-6,7-10 |
| Challenger Milan - MP | 2018/06/25 12:30 | Gonzales/Lammons v Baldi/Dalla Valle | 6-3,3-6,12-14 |
| Challenger L'Aquila MD | 2018/06/20 13:30 | Cuevas/Motti v Gonzales/Lammons | 1-6,6-3,11-9 |