Head to Head
| Japan NPB | 2021/07/07 09:00 | Seibu Lions v Nippon Ham Fighters | W | 1-2 |
| Japan NPB | 2021/07/06 09:00 | Seibu Lions v Nippon Ham Fighters | W | 3-4 |
| Japan NPB | 2021/05/23 05:00 | Nippon Ham Fighters v Seibu Lions | W | 10-3 |
| Japan NPB | 2021/05/22 05:00 | Nippon Ham Fighters v Seibu Lions | L | 1-8 |
| Japan NPB | 2021/05/21 08:45 | Nippon Ham Fighters v Seibu Lions | L | 1-7 |
| Japan NPB | 2021/05/01 05:00 | Seibu Lions v Nippon Ham Fighters | W | 4-5 |
| Japan NPB | 2021/04/30 09:00 | Seibu Lions v Nippon Ham Fighters | L | 5-1 |
| Japan NPB | 2021/04/14 08:45 | Nippon Ham Fighters v Seibu Lions | L | 1-2 |
Home History
| Japan NPB | 2021/07/14 04:00 | Orix Buffaloes v Nippon Ham Fighters | W | 2-6 |
| Japan NPB | 2021/07/13 04:00 | Orix Buffaloes v Nippon Ham Fighters | L | 5-0 |
| Japan NPB | 2021/07/10 08:00 | Nippon Ham Fighters v Lotte Marines | D | 4-4 |
| Japan NPB | 2021/07/09 08:45 | Nippon Ham Fighters v Lotte Marines | W | 6-1 |
| Japan NPB | 2021/07/07 09:00 | Seibu Lions v Nippon Ham Fighters | W | 1-2 |
| Japan NPB | 2021/07/06 09:00 | Seibu Lions v Nippon Ham Fighters | W | 3-4 |
| Japan NPB | 2021/07/04 08:45 | Softbank Hawks v Nippon Ham Fighters | L | 5-0 |
| Japan NPB | 2021/07/03 08:45 | Softbank Hawks v Nippon Ham Fighters | L | 7-1 |
Away History
| Japan NPB Exhibition | 2021/07/31 09:00 | Seibu Lions v Hanshin Tigers | L | 3-6 |
| Japan NPB Exhibition | 2021/07/30 09:00 | Seibu Lions v Hanshin Tigers | L | 2-3 |
| Japan NPB | 2021/07/14 08:45 | Lotte Marines v Seibu Lions | W | 3-8 |
| Japan NPB | 2021/07/13 08:45 | Lotte Marines v Seibu Lions | L | 7-6 |
| Japan NPB | 2021/07/11 04:00 | Seibu Lions v Rakuten Eagles | L | 3-9 |
| Japan NPB | 2021/07/10 07:00 | Seibu Lions v Rakuten Eagles | W | 6-2 |
| Japan NPB | 2021/07/07 09:00 | Seibu Lions v Nippon Ham Fighters | L | 1-2 |
| Japan NPB | 2021/07/06 09:00 | Seibu Lions v Nippon Ham Fighters | L | 3-4 |