Stadium: Court 12 Round: 27 Ground: Hardcourt outdoor
| ITF Portugal F18 | 2018/09/29 12:25 | Tiago Cacao v Yannick Mertens | 4-6,1-6 |
| ITF Portugal F1 | 2018/02/24 13:05 | Yannick Mertens v Tiago Cacao | 3-6,6-4,4-6 |
| ITF Portugal F11 | 2016/09/30 13:00 | Yannick Mertens v Tiago Cacao | 6-3,7-6 |
| ITF - M15 Sintra | 2019/08/22 09:00 | Tiago Cacao v Filipe Brandao | 0-6,6-3,6-4 |
| ITF - M15 Sintra | 2019/08/20 13:15 | Tiago Cacao v Pedro Araujo | 7-5,6-2 |
| ITF - M15 Sintra | 2019/08/17 09:30 | Fred Gil v Tiago Cacao | 6-7,6-4,6-2 |
| ITF - M15 Sintra | 2019/08/16 09:30 | Tiago Cacao v Peter Bothwell | 6-2,6-1 |
| ITF - M15 Sintra | 2019/08/15 09:00 | Tiago Cacao v Pavel Shumeiko | 6-3,6-2 |
| ITF - M15 Sintra | 2019/08/14 09:00 | Tiago Cacao v Manuel Goncalves | 6-1,6-2 |
| ITF - M15 Castelo Branco | 2019/07/16 17:05 | Francisco Rocha v Tiago Cacao | 2-6,1-6 |
| ITF M15 Idanha-a-Nova | 2019/07/10 09:00 | Michel Vernier v Tiago Cacao | 6-3,3-6,7-5 |
| ITF - M15 Sintra | 2019/08/22 09:00 | Stuart Parker v Yannick Mertens | 6-4,3-6,2-6 |
| ITF - M15 Sintra | 2019/08/21 14:20 | Quentin Gueydan v Yannick Mertens | 1-6,1-6 |
| Challenger - Granby | 2019/07/24 15:35 | Andrew Harris v Yannick Mertens | 6-1,6-1 |
| Challenger - Granby | 2019/07/23 14:00 | Yannick Mertens v Kooros Ghasemi | 6-2,6-0 |
| ATP - Bastad | 2019/07/14 10:00 | Yannick Mertens v Roberto Quiroz | 1-6,2-6 |
| ITF - M25 Ajaccio | 2019/07/11 15:00 | Laurent Lokoli v Yannick Mertens | 6-1,6-4 |
| ITF - M25 Ajaccio | 2019/07/10 15:40 | Alexandre Peyrot v Yannick Mertens | 6-3,3-6,6-7 |
| ITF M25 Palma del Rio | 2019/06/27 18:45 | Ricardo Ojeda Lara v Yannick Mertens | 6-3,6-1 |