| Challenger - Florianopolis | 04/20 22:05 | 26 | [303] Matheus P De Almeida v Alejandro Tabilo [176] | 4-6,6-7 | |
| Challenger - Florianopolis | 04/19 14:40 | 25 | Pedro Rodrigues v Matheus P De Almeida | 2-6,6-7 | |
| ATP - Rio de Janeiro | 02/18 19:00 | 14 | [105] Juan Manuel Cerundolo v Matheus P De Almeida [216] | 6-2,6-3 | |
| Davis Cup | 02/04 16:00 | 45 | Matheus P De Almeida v Jie Cui | Cancelled | |
| Davis Cup | 02/03 15:00 | 45 | Matheus P De Almeida v Rigele Te | 6-1,6-2 | |
| Challenger - Concepción | 01/25 14:00 | 25 | [212] Matheus P De Almeida v Hernan Casanova [263] | 7-6,1-6,6-7 | |
| Challenger - Piracicaba | 01/17 21:40 | 25 | [212] Matheus P De Almeida v Nicolas Mejia [260] | Retired | |
| Australian Open | 01/10 00:15 | 14 | [210] Matheus P De Almeida v Benoit Paire [172] | 4-6,7-6,5-7 | |
| Challenger - Sao Leopoldo | 11/15 15:15 | 25 | [203] Matheus P De Almeida v Daniel Dutra Da Silva [258] | 5-7,2-6 | |
| Challenger - Montevideo | 11/09 16:00 | 26 | [209] Nicolas Kicker v Matheus P De Almeida [199] | 4-6,6-3,6-3 | |
| Challenger - Montevideo | 11/08 15:00 | 25 | [199] Matheus P De Almeida v Santiago R Taverna [163] | 7-6,6-3 | |
| Challenger - Guayaquil | 11/04 17:45 | 27 | [71] Federico Coria v Matheus P De Almeida [214] | 6-4,6-4 | |
| Challenger - Guayaquil | 11/03 15:00 | 26 | [214] Matheus P De Almeida v Felipe M R Alves [166] | 6-3,6-4 | |
| Challenger - Guayaquil | 11/02 15:00 | 25 | [263] Nikolas S Izquierdo v Matheus P De Almeida [214] | 1-6,6-7 | |
| Challenger - Lima | 10/24 20:05 | 25 | [212] Matheus P De Almeida v Renzo Olivo [185] | Cancelled | |
| Challenger - Rio de Janeiro | 10/14 18:35 | 27 | [117] Marco Cecchinato v Matheus P De Almeida [193] | 7-6,2-6,7-6 | |
| Challenger - Rio de Janeiro | 10/13 19:00 | 26 | [193] Matheus P De Almeida v Giovanni M Perricard [433] | 6-3,6-3 | |
| Challenger - Rio de Janeiro | 10/11 16:30 | 25 | [220] Francisco Comesana v Matheus P De Almeida [193] | 0-6,1-6 | |
| Challenger - Campinas | 10/06 21:05 | 26 | [187] Luciano Darderi v Matheus P De Almeida [193] | 6-3,6-7,6-3 | |
| Challenger - Campinas | 10/04 20:30 | 25 | [462] Daniel Rincon v Matheus P De Almeida [193] | 2-6,6-7 | |
| Challenger Braga | 09/25 10:00 | 29 | [216] Matheus P De Almeida v Nicolas Moreno De Alboran [308] | 2-6,4-6 | |
| Challenger Braga | 09/24 13:00 | 28 | [216] Matheus P De Almeida v Jelle Sels [196] | 6-2,6-2 | |
| Challenger Braga | 09/23 12:15 | 27 | Matheus P De Almeida v Pablo Llamas Ruiz | 6-3,6-3 | |
| Challenger Braga | 09/22 11:40 | 26 | [94] Nuno Borges v Matheus P De Almeida [216] | 2-6,4-6 | |
| Challenger Braga | 09/20 16:00 | 25 | Matheus P De Almeida v Jeremy Jahn | 6-4,6-4 | |
| Challenger - Cassis | 09/06 12:00 | 25 | [389] Terence Atmane v Matheus P De Almeida [219] | 6-1,7-6 | |
| Challenger - Mallorca | 09/01 15:50 | 26 | [219] Matheus P De Almeida v Mikhail Kukushkin [214] | 2-6,4-6 | |
| Challenger - Mallorca | 08/30 11:10 | 25 | [190] Daniel Masur v Matheus P De Almeida [219] | 6-3,6-7,3-6 | |
| US Open | 08/24 18:25 | 14 | [194] Enzo Couacaud v Matheus P De Almeida [214] | 6-3,6-2 | |
| Challenger - San Benedetto | 07/27 16:00 | 26 | [213] Matheus P De Almeida v Raul Brancaccio [284] | 2-6,0-6 |