Head to Head
| World Rugby U20 Champs | 2018/06/07 16:30 | Wales U20 v Japan U20 | W | 18-17 |
| World Rugby U20 Champs | 2015/06/10 16:30 | Wales U20 v Japan U20 | W | 66-3 |
Home History
| World Rugby U20 Champs | 2023/06/24 14:00 | Wales U20 v New Zealand U20 | L | 26-27 |
| Six Nations U20 | 2023/03/19 20:00 | France U20 v Wales U20 | L | 67-17 |
| Six Nations U20 | 2023/03/10 19:15 | Italy U20 v Wales U20 | L | 29-25 |
| Six Nations U20 | 2023/02/24 19:15 | Wales U20 v England U20 | L | 21-37 |
| Six Nations U20 | 2023/02/10 19:15 | Scotland U20 v Wales U20 | L | 18-17 |
| Six Nations U20 | 2023/02/03 19:00 | Wales U20 v Ireland U20 | L | 27-44 |
| Six Nations U20 Summer Series | 2022/07/12 19:00 | South Africa U20 v Wales U20 | L | 47-27 |
| Six Nations U20 Summer Series | 2022/07/06 18:00 | Wales U20 v Italy U20 | W | 23-20 |
Away History
| World Rugby U20 Champs | 2023/06/24 12:00 | France U20 v Japan U20 | L | 75-12 |
| World Rugby U20 Champs | 2018/06/17 09:00 | Ireland U20 v Japan U20 | L | 39-33 |
| World Rugby U20 Champs | 2018/06/12 16:30 | Georgia U20 v Japan U20 | L | 24-22 |
| World Rugby U20 Champs | 2018/06/07 16:30 | Wales U20 v Japan U20 | L | 18-17 |
| World Rugby U20 Champs | 2018/06/03 12:00 | Australia U20 v Japan U20 | L | 54-19 |
| World Rugby U20 Champs | 2018/05/30 19:00 | New Zealand U20 v Japan U20 | L | 67-0 |
| World Rugby U20 Champs | 2016/06/25 11:00 | Italy U20 v Japan U20 | L | 41-17 |
| World Rugby U20 Champs | 2016/06/20 16:30 | France U20 v Japan U20 | L | 41-27 |