Head to Head
| Japonia - NPB - Amical | 2021/03/20 04:00 | Yakult Swallows v Seibu Lions | L | 1-2 |
| Japonia - NPB - Amical | 2020/03/15 04:00 | Seibu Lions v Yakult Swallows | L | 3-1 |
| Japonia - NPB - Amical | 2020/03/14 04:00 | Seibu Lions v Yakult Swallows | L | 1-0 |
| Japonia - NPB - Amical | 2020/03/13 04:00 | Seibu Lions v Yakult Swallows | L | 7-2 |
| Japonia - NPB | 2019/06/16 04:00 | Yakult Swallows v Seibu Lions | L | 6-10 |
| Japonia - NPB | 2019/06/15 05:00 | Yakult Swallows v Seibu Lions | W | 6-5 |
| Japonia - NPB | 2019/06/14 09:00 | Yakult Swallows v Seibu Lions | L | 1-11 |
| Japan Pre-Season Friendlies | 2019/03/17 04:00 | Yakult Swallows v Seibu Lions | L | 5-7 |
Home History
| Japonia - NPB - Amical | 2021/03/20 04:00 | Yakult Swallows v Seibu Lions | L | 1-2 |
| Japonia - NPB - Amical | 2021/03/19 04:00 | Rakuten Eagles v Yakult Swallows | W | 4-8 |
| Japonia - NPB - Amical | 2021/03/17 04:00 | Hiroshima Carp v Yakult Swallows | L | 11-0 |
| Japonia - NPB - Amical | 2021/03/16 04:00 | Hanshin Tigers v Yakult Swallows | L | 9-6 |
| Japonia - NPB - Amical | 2021/03/14 04:00 | Chunichi Dragons v Yakult Swallows | W | 4-5 |
| Japonia - NPB - Amical | 2021/03/12 04:00 | Softbank Hawks v Yakult Swallows | D | 8-8 |
| Japonia - NPB - Amical | 2021/03/10 09:00 | Yakult Swallows v Orix Buffaloes | L | 6-7 |
| Japonia - NPB - Amical | 2021/03/09 09:00 | Yakult Swallows v Orix Buffaloes | L | 1-4 |
Away History
| Japonia - NPB - Amical | 2021/03/20 04:00 | Yakult Swallows v Seibu Lions | W | 1-2 |
| Japonia - NPB - Amical | 2021/03/19 04:00 | Yokohama Bay Stars v Seibu Lions | L | 5-1 |
| Japonia - NPB - Amical | 2021/03/17 04:00 | Hanshin Tigers v Seibu Lions | L | 5-3 |
| Japonia - NPB - Amical | 2021/03/16 04:00 | Hiroshima Carp v Seibu Lions | W | 0-1 |
| Japonia - NPB - Amical | 2021/03/14 05:00 | Seibu Lions v Orix Buffaloes | L | 0-5 |
| Japonia - NPB - Amical | 2021/03/13 04:00 | Seibu Lions v Hanshin Tigers | W | 6-2 |
| Japonia - NPB - Amical | 2021/03/10 04:00 | Seibu Lions v Chunichi Dragons | W | 14-2 |
| Japonia - NPB - Amical | 2021/03/09 04:00 | Seibu Lions v Chunichi Dragons | W | 7-2 |