Head to Head
| Japan NPB | 2021/06/04 08:30 | Seibu Lions v Yakult Swallows | L | 1-10 |
| Japan NPB Exhibition | 2021/03/21 04:00 | Yakult Swallows v Seibu Lions | W | 6-8 |
| Japan NPB Exhibition | 2021/03/20 04:00 | Yakult Swallows v Seibu Lions | W | 1-2 |
| Japan NPB Exhibition | 2020/03/15 04:00 | Seibu Lions v Yakult Swallows | W | 3-1 |
| Japan NPB Exhibition | 2020/03/14 04:00 | Seibu Lions v Yakult Swallows | W | 1-0 |
| Japan NPB Exhibition | 2020/03/13 04:00 | Seibu Lions v Yakult Swallows | W | 7-2 |
| Japan NPB | 2019/06/16 04:00 | Yakult Swallows v Seibu Lions | W | 6-10 |
| Japan NPB | 2019/06/15 05:00 | Yakult Swallows v Seibu Lions | L | 6-5 |
Home History
| Japan NPB | 2021/06/04 08:30 | Seibu Lions v Yakult Swallows | L | 1-10 |
| Japan NPB | 2021/06/03 08:45 | Seibu Lions v Yomiuri Giants | D | 4-4 |
| Japan NPB | 2021/06/02 08:45 | Seibu Lions v Yomiuri Giants | L | 3-4 |
| Japan NPB | 2021/06/01 08:45 | Seibu Lions v Yomiuri Giants | D | 4-4 |
| Japan NPB | 2021/05/30 04:00 | Hanshin Tigers v Seibu Lions | L | 9-8 |
| Japan NPB | 2021/05/29 08:45 | Hanshin Tigers v Seibu Lions | W | 0-1 |
| Japan NPB | 2021/05/28 08:45 | Hanshin Tigers v Seibu Lions | L | 10-7 |
| Japan NPB | 2021/05/27 09:00 | Seibu Lions v Hiroshima Carp | D | 4-4 |
Away History
| Japan NPB | 2021/06/04 08:30 | Seibu Lions v Yakult Swallows | W | 1-10 |
| Japan NPB | 2021/06/03 08:30 | Rakuten Eagles v Yakult Swallows | L | 4-2 |
| Japan NPB | 2021/06/02 08:30 | Rakuten Eagles v Yakult Swallows | L | 3-1 |
| Japan NPB | 2021/06/01 08:30 | Rakuten Eagles v Yakult Swallows | W | 4-7 |
| Japan NPB | 2021/05/30 04:00 | Yakult Swallows v Orix Buffaloes | L | 7-8 |
| Japan NPB | 2021/05/29 05:00 | Yakult Swallows v Orix Buffaloes | W | 7-4 |
| Japan NPB | 2021/05/28 09:00 | Yakult Swallows v Orix Buffaloes | L | 2-9 |
| Japan NPB | 2021/05/27 08:30 | Nippon Ham Fighters v Yakult Swallows | W | 2-5 |