Head to Head
| Japan NPB | 2021/08/18 08:45 | Seibu Lions v Lotte Marines | L | 3-5 |
| Japan NPB | 2021/08/17 08:45 | Seibu Lions v Lotte Marines | W | 8-2 |
| 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 | 2021/06/20 04:00 | Lotte Marines v Seibu Lions | D | 3-3 |
| Japan NPB | 2021/06/19 05:00 | Lotte Marines v Seibu Lions | W | 2-7 |
| Japan NPB | 2021/06/18 08:45 | Lotte Marines v Seibu Lions | L | 5-0 |
| Japan NPB | 2021/05/16 05:00 | Seibu Lions v Lotte Marines | D | 6-6 |
Home History
| Japan NPB | 2021/08/18 08:45 | Seibu Lions v Lotte Marines | L | 3-5 |
| Japan NPB | 2021/08/17 08:45 | Seibu Lions v Lotte Marines | W | 8-2 |
| Japan NPB | 2021/08/15 08:00 | Rakuten Eagles v Seibu Lions | W | 2-10 |
| Japan NPB | 2021/08/14 08:00 | Rakuten Eagles v Seibu Lions | L | 7-6 |
| Japan NPB | 2021/08/13 08:45 | Rakuten Eagles v Seibu Lions | L | 5-0 |
| Japan NPB Exhibition | 2021/08/01 09:00 | Seibu Lions v Hanshin Tigers | L | 0-3 |
| 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 |
Away History
| Japan NPB | 2021/08/18 08:45 | Seibu Lions v Lotte Marines | W | 3-5 |
| Japan NPB | 2021/08/17 08:45 | Seibu Lions v Lotte Marines | L | 8-2 |
| Japan NPB | 2021/08/15 08:00 | Orix Buffaloes v Lotte Marines | L | 5-3 |
| Japan NPB | 2021/08/14 08:00 | Orix Buffaloes v Lotte Marines | W | 2-4 |
| Japan NPB | 2021/08/13 08:45 | Orix Buffaloes v Lotte Marines | L | 6-3 |
| Japan NPB Exhibition | 2021/07/27 09:00 | Lotte Marines v Hanshin Tigers | L | 4-6 |
| Japan NPB | 2021/07/14 08:45 | Lotte Marines v Seibu Lions | L | 3-8 |
| Japan NPB | 2021/07/13 08:45 | Lotte Marines v Seibu Lions | W | 7-6 |