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