Head to Head
| Japan Pre-Season Friendlies | 2019/03/23 04:00 | Seibu Lions v Yokohama Bay Stars | W | 4-3 |
| Japan Pre-Season Friendlies | 2019/03/16 04:00 | Yokohama Bay Stars v Seibu Lions | W | 1-4 |
| Japan - NPB | 2018/06/18 09:00 | Seibu Lions v Yokohama Bay Stars | L | 2-4 |
| Japan - NPB | 2018/06/07 09:00 | Seibu Lions v Yokohama Bay Stars | W | 9-7 |
| Japan - NPB | 2018/06/05 09:00 | Seibu Lions v Yokohama Bay Stars | W | 8-1 |
| Japan - NPB | 2017/06/11 04:00 | Yokohama Bay Stars v Seibu Lions | W | 0-1 |
| Japan - NPB | 2017/06/10 05:00 | Yokohama Bay Stars v Seibu Lions | W | 2-6 |
| Japan - NPB | 2017/06/09 09:00 | Yokohama Bay Stars v Seibu Lions | L | 4-3 |
Home History
| Japan Pre-Season Friendlies | 2019/03/23 04:00 | Seibu Lions v Yokohama Bay Stars | W | 4-3 |
| Japan Pre-Season Friendlies | 2019/03/22 09:00 | Seibu Lions v Hiroshima Carp | L | 0-4 |
| Japan Pre-Season Friendlies | 2019/03/21 05:00 | Seibu Lions v Rakuten Eagles | L | 4-6 |
| Japan Pre-Season Friendlies | 2019/03/21 04:00 | Seibu Lions v Yomiuri Giants | L | 2-13 |
| Japan Pre-Season Friendlies | 2019/03/20 09:00 | Seibu Lions v Rakuten Eagles | W | 4-3 |
| Japan Pre-Season Friendlies | 2019/03/17 04:00 | Yakult Swallows v Seibu Lions | W | 5-7 |
| Japan Pre-Season Friendlies | 2019/03/16 04:00 | Hanshin Tigers v Seibu Lions | W | 1-5 |
| Japan Pre-Season Friendlies | 2019/03/16 04:00 | Yokohama Bay Stars v Seibu Lions | W | 1-4 |
Away History
| Japan Pre-Season Friendlies | 2019/03/23 04:00 | Seibu Lions v Yokohama Bay Stars | L | 4-3 |
| Japan Pre-Season Friendlies | 2019/03/21 04:00 | Yokohama Bay Stars v Nippon Ham Fighters | D | 2-2 |
| Japan Pre-Season Friendlies | 2019/03/20 04:00 | Yokohama Bay Stars v Hiroshima Carp | D | 0-0 |
| Japan Pre-Season Friendlies | 2019/03/19 04:00 | Yokohama Bay Stars v Hanshin Tigers | W | 8-4 |
| Japan Pre-Season Friendlies | 2019/03/17 04:00 | Yokohama Bay Stars v Lotte Marines | W | 7-4 |
| Japan Pre-Season Friendlies | 2019/03/16 04:00 | Yokohama Bay Stars v Seibu Lions | L | 1-4 |
| Japan Pre-Season Friendlies | 2019/03/14 04:00 | Rakuten Eagles v Yokohama Bay Stars | L | 5-2 |
| Japan Pre-Season Friendlies | 2019/03/13 04:00 | Rakuten Eagles v Yokohama Bay Stars | L | 4-3 |