| North American Open | 2019/12/07 00:50 | Monteiro, Thiago v Haidong Xu | L | 3-4 |
| North American Open | 2019/12/06 20:15 | Monteiro, Thiago v Miguel Vilchez | W | 4-2 |
| Austrian Open 2019, MS | 2019/11/13 12:30 | Maharu Yoshimura v Monteiro, Thiago | L | 4-2 |
| Polish Open | 2019/10/19 17:30 | Haidong Xu v Monteiro, Thiago | L | 4-0 |
| Polish Open | 2019/10/19 12:20 | Kakeru Sone v Monteiro, Thiago | W | 0-4 |
| Polish Open | 2019/10/18 12:20 | Jiri Martinko v Monteiro, Thiago | W | 3-4 |
| German Open 2020, MS | 2019/10/08 17:35 | Hon Ming Li v Monteiro, Thiago | W | 2-4 |
| Swedish Open (WTP) 2019, MS, Qualification | 2019/10/01 14:10 | Monteiro, Thiago v Zhang, Yudong | L | 1-4 |
| North American Open | 2019/12/05 18:15 | Ren, Hao v Kai Zhang | L | 4-0 |
| Team World Cup, Doubles | 2019/11/07 11:30 | Jingkun Liang v Kai Zhang | L | 3-0 |
| Team World Cup, Doubles | 2019/11/07 02:00 | Elias Ranefur v Kai Zhang | W | 1-3 |
| Paraguay Open | 2019/09/13 16:35 | Kai Zhang v Horacio Cifuentes | L | 1-4 |
| Paraguay Open | 2019/09/12 18:00 | Koki Niwa v Kai Zhang | W | 2-4 |
| Paraguay Open | 2019/09/11 20:20 | Kai Zhang v Daniel Gonzalez | L | 3-4 |
| Paraguay Open | 2019/09/11 16:30 | Gaston Alto v Kai Zhang | L | 3-2 |
| Paraguay Open | 2019/09/10 22:45 | Kai Zhang v Santos, Daniel | W | 3-1 |