| North American Open | 2019/12/05 20:05 | Pieraert, Valentin v Chen, Hongtao | L | 3-4 |
| Oman Open U21 Women | 2019/12/04 17:00 | Pieraert, Valentin v Santiago Lorenzo | L | 1-3 |
| Oman Open U21 Women | 2019/10/30 11:35 | Pieraert, Valentin v Cristian Pletea | L | 1-3 |
| Slovenia Open U21 | 2019/05/10 07:00 | Pieraert, Valentin v Man Ho Kwan | L | 1-3 |
| Slovenia Open U21 | 2019/05/09 07:00 | Pieraert, Valentin v Federico Giardi | W | 3-0 |
| Qatar Open XD | 2019/03/21 09:05 | Pieraert, Valentin v Aleksa Gacev | W | 3-1 |
| Qatar Open XD | 2019/03/20 13:40 | Pieraert, Valentin v Kovacs, Sebestyen | L | 0-3 |
| Oman Open U21 Women | 2019/02/13 09:00 | Jiri Martinko v Pieraert, Valentin | L | 3-2 |