Head to Head
| Japan 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 |
| Japan NPB | 2018/06/14 09:00 | Yakult Swallows v Seibu Lions | W | 6-4 |
| Japan NPB | 2018/06/13 09:00 | Yakult Swallows v Seibu Lions | L | 4-7 |
| Japan NPB | 2018/06/12 09:00 | Yakult Swallows v Seibu Lions | W | 3-1 |
| Japan NPB | 2017/06/04 04:00 | Seibu Lions v Yakult Swallows | D | 8-8 |
| Japan NPB | 2017/06/03 05:00 | Seibu Lions v Yakult Swallows | L | 11-2 |
| Japan NPB | 2017/06/02 09:00 | Seibu Lions v Yakult Swallows | L | 3-2 |
Home History
| Japan NPB | 2019/06/14 09:00 | Yakult Swallows v Seibu Lions | L | 1-11 |
| Japan NPB | 2019/06/13 09:00 | Yakult Swallows v Rakuten Eagles | W | 11-3 |
| Japan NPB | 2019/06/12 09:00 | Yakult Swallows v Rakuten Eagles | L | 4-7 |
| Japan NPB | 2019/06/11 09:00 | Yakult Swallows v Rakuten Eagles | L | 1-3 |
| Japan NPB | 2019/06/09 04:00 | Orix Buffaloes v Yakult Swallows | W | 4-9 |
| Japan NPB | 2019/06/08 05:00 | Orix Buffaloes v Yakult Swallows | L | 5-4 |
| Japan NPB | 2019/06/06 09:00 | Yakult Swallows v Nippon Ham Fighters | L | 1-3 |
| Japan NPB | 2019/06/05 09:00 | Yakult Swallows v Nippon Ham Fighters | W | 5-0 |
Away History
| Japan NPB | 2019/06/14 09:00 | Yakult Swallows v Seibu Lions | W | 1-11 |
| Japan NPB | 2019/06/13 09:00 | Yomiuri Giants v Seibu Lions | L | 8-2 |
| Japan NPB | 2019/06/12 09:00 | Yomiuri Giants v Seibu Lions | L | 9-4 |
| Japan NPB | 2019/06/11 09:00 | Yomiuri Giants v Seibu Lions | W | 0-4 |
| Japan NPB | 2019/06/09 04:00 | Seibu Lions v Yokohama Bay Stars | L | 4-6 |
| Japan NPB | 2019/06/08 05:00 | Seibu Lions v Yokohama Bay Stars | L | 3-7 |
| Japan NPB | 2019/06/07 09:00 | Seibu Lions v Yokohama Bay Stars | W | 6-2 |
| Japan NPB | 2019/06/06 09:00 | Hiroshima Carp v Seibu Lions | W | 2-9 |