Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| Challenger Santiago Qual | 2018/03/04 17:10 | Joao Monteiro v Juan Pablo Ficovich | 2-6,3-6 |
| Challenger Santiago Qual | 2018/03/03 18:55 | Joao Monteiro v Thiago Seyboth Wild | 6-4,7-6 |
| Challenger Punta del Este | 2018/02/26 23:45 | Guido Andreozzi v Joao Monteiro | 2-6,7-6,6-4 |
| ITF Spain F2 | 2018/01/26 13:00 | Joao Monteiro v Yunseong Chung | 7-6,5-7,3-6 |
| ITF Spain F2 | 2018/01/25 09:00 | Joao Monteiro v Pietro Rondoni | 6-0,6-2 |
| ITF Spain F2 | 2018/01/23 12:35 | Joao Monteiro v David Vega Hernandez | 7-6,3-6,6-2 |
| Australian Open Qual | 2018/01/10 05:05 | Joao Monteiro v Carlos Taberner | 2-6,6-4,5-7 |
| ITF Tunisia F33 | 2017/11/05 11:00 | Joao Monteiro v Samuel Bensoussan | 7-6,6-3 |
| ITF Portugal F4 | 2018/03/14 11:40 | Marc Sieber v Alejandro Davidovich Fokina | 3-6,3-6 |
| ITF Portugal F4 | 2018/03/13 12:25 | Marc Sieber v Yann Marti | 6-2,0-6,6-1 |
| ITF Turkey F8 | 2018/03/01 09:30 | Marc Sieber v Marko Miladinovic | 6-7,6-4,4-6 |
| ITF Turkey F8 | 2018/02/28 08:30 | Marc Sieber v Ivan Davydov | 6-3,6-3 |
| Challenger Bergamo Qual | 2018/02/18 10:50 | Marc Sieber v Yannick Jankovits | 2-6,6-3,3-6 |
| Challenger Bergamo Qual | 2018/02/17 12:00 | Daniel Masur v Marc Sieber | 3-6,3-6 |
| Challenger Budapest Qual | 2018/02/04 11:30 | Marc Sieber v Alessandro Bega | 7-6,0-6,5-7 |
| Challenger Budapest Qual | 2018/02/03 08:30 | Jurabek Karimov v Marc Sieber | 1-6,3-6 |