Face à face
| Japon - NPB | 2021/09/15 08:45 | Nippon Ham Fighters v Seibu Lions | D | 3-3 |
| Japon - NPB | 2021/09/14 08:45 | Nippon Ham Fighters v Seibu Lions | L | 1-3 |
| Japon - NPB | 2021/08/29 08:00 | Nippon Ham Fighters v Seibu Lions | W | 6-0 |
| Japon - NPB | 2021/08/28 08:00 | Nippon Ham Fighters v Seibu Lions | D | 8-8 |
| Japon - NPB | 2021/08/27 08:45 | Nippon Ham Fighters v Seibu Lions | W | 7-2 |
| Japon - NPB | 2021/07/07 09:00 | Seibu Lions v Nippon Ham Fighters | W | 1-2 |
| Japon - NPB | 2021/07/06 09:00 | Seibu Lions v Nippon Ham Fighters | W | 3-4 |
| Japon - NPB | 2021/05/23 05:00 | Nippon Ham Fighters v Seibu Lions | W | 10-3 |
| Japon - NPB | 2021/05/22 05:00 | Nippon Ham Fighters v Seibu Lions | L | 1-8 |
| Japon - NPB | 2021/05/21 08:45 | Nippon Ham Fighters v Seibu Lions | L | 1-7 |
| Japon - NPB | 2021/05/01 05:00 | Seibu Lions v Nippon Ham Fighters | W | 4-5 |
| Japon - NPB | 2021/04/30 09:00 | Seibu Lions v Nippon Ham Fighters | L | 5-1 |
| Japon - NPB | 2021/04/14 08:45 | Nippon Ham Fighters v Seibu Lions | L | 1-2 |
| Japon - NPB | 2021/04/13 08:45 | Nippon Ham Fighters v Seibu Lions | W | 3-2 |
| Japon - NPB | 2021/03/31 09:00 | Seibu Lions v Nippon Ham Fighters | D | 1-1 |
| Japon - NPB | 2021/03/30 09:30 | Seibu Lions v Nippon Ham Fighters | L | 11-4 |
| Japon - NPB - Exhibition | 2021/03/04 09:00 | Seibu Lions v Nippon Ham Fighters | L | 6-1 |
| Japon - NPB - Exhibition | 2021/03/03 09:00 | Seibu Lions v Nippon Ham Fighters | W | 0-7 |
| Japon - NPB | 2020/11/04 09:00 | Nippon Ham Fighters v Seibu Lions | L | 3-10 |
| Japon - NPB | 2020/11/03 05:00 | Nippon Ham Fighters v Seibu Lions | L | 4-5 |
| Japon - NPB | 2020/11/02 09:00 | Nippon Ham Fighters v Seibu Lions | L | 0-4 |
| Japon - NPB | 2020/10/15 09:00 | Seibu Lions v Nippon Ham Fighters | W | 3-8 |
| Japon - NPB | 2020/10/14 09:00 | Seibu Lions v Nippon Ham Fighters | W | 2-7 |
| Japon - NPB | 2020/10/13 09:00 | Seibu Lions v Nippon Ham Fighters | L | 7-0 |
| Japon - NPB | 2020/09/24 09:00 | Nippon Ham Fighters v Seibu Lions | W | 12-2 |
| Japon - NPB | 2020/09/23 09:00 | Nippon Ham Fighters v Seibu Lions | L | 5-6 |
| Japon - NPB | 2020/09/22 09:00 | Nippon Ham Fighters v Seibu Lions | W | 5-1 |
| Japon - NPB | 2020/09/06 04:00 | Seibu Lions v Nippon Ham Fighters | L | 4-2 |
| Japon - NPB | 2020/09/05 05:00 | Seibu Lions v Nippon Ham Fighters | W | 2-6 |
| Japon - NPB | 2020/09/04 09:00 | Seibu Lions v Nippon Ham Fighters | L | 6-2 |