Stadium: Estadio Millennium Round: 29 Ground: Clay
| ATP Estoril - MD | 2018/05/05 12:00 | Eysseric/Salisbury v Koolhof/Sitak | 5-7,3-6 |
| ATP Estoril - MD | 2018/05/03 13:45 | Koolhof/Sitak v Elias/Sousa | 7-6,4-6,10-8 |
| ATP Estoril - MD | 2018/05/02 11:00 | Lopez/Marrero v Koolhof/Sitak | 7-6,4-6,3-10 |
| ATP Budapest MD | 2018/04/26 09:00 | Koolhof/Sitak v Matkowski/Monroe | 3-6,4-6 |
| ATP Budapest MD | 2018/04/25 09:00 | Mektic/Peya v Koolhof/Sitak | 5-7,7-6,7-10 |
| ATP Marrakech - MD | 2018/04/11 16:50 | Koolhof/Sitak v Sharan/Struff | 6-7,3-6 |
| Challenger Alicante - MD | 2018/04/06 14:45 | Koolhof/Sitak v Andreozzi/Behar | 6-3,6-2 |
| Challenger Alicante - MD | 2018/04/05 09:30 | Koolhof/Sitak v Martinez Portero/Vega Hernandez | 5-7,6-4,10-5 |
| ATP Estoril - MD | 2018/05/05 18:15 | Mayer/Sousa v Edmund/Norrie | 2-6,6-7 |
| ATP Estoril - MD | 2018/05/03 17:00 | Edmund/Norrie v De Minaur/Hewitt | 6-4,7-6 |
| ATP Estoril - MD | 2018/04/30 20:10 | Delbonis/Kicker v Edmund/Norrie | 4-6,0-6 |