ATP Tennis - Thiago Monteiro
- Tournament: N/A
- Round: N/A
- Opponent: N/A
- DOB: 1994-05-31
- Birthplace: Brazil, Brazil
- Height: N/A
- Weight: N/A
- Plays: L
- Current World Rank: 82
- Hard: 3-17
- Clay: 28-34
- Grass: 1-2
| Tournament | Date | Sets | Round | Winner | Loser |
|---|---|---|---|---|---|
| Chile Open | Feb 28, 2020 | 6-4, 6-4 | Quarter Finals | Albert Ramos-Vinolas | Thiago Monteiro |
| Chile Open | Feb 27, 2020 | 6-1, 6-4 | Second Round | Thiago Monteiro | Roberto Carballes Baena |
| Chile Open | Feb 25, 2020 | 6-7 (0-7), 6-3, 6-4 | First Round | Thiago Monteiro | Leonardo Mayer |
| Rio Open | Feb 19, 2020 | 1-6, 6-1, 6-4 | Second Round | Attila Balazs | Thiago Monteiro |
| Rio Open | Feb 18, 2020 | 5-7, 6-4, 7-6 (7-3) | First Round | Thiago Monteiro | Guido Pella |
| Argentina Open | Feb 14, 2020 | 7-6 (7-5), 6-4 | Quarter Finals | Pedro Sousa | Thiago Monteiro |
| Argentina Open | Feb 12, 2020 | 6-4, 7-6 (8-6) | Second Round | Thiago Monteiro | Borna Coric |
| Argentina Open | Feb 10, 2020 | 6-3, 6-3 | First Round | Thiago Monteiro | Jaume Munar |
| Cordoba Open | Feb 4, 2020 | 6-4, 6-3 | First Round | Corentin Moutet | Thiago Monteiro |
| Australian Open | Jan 21, 2020 | 6-7 (5-7), 7-6 (7-4), 7-6 (9-7), 7-6 (7-5) | First Round | John Isner | Thiago Monteiro |
