| Japan NPB Reserve League | 2020/09/29 09:00 | Seibu Lions Reserves v Yokohama Bay Stars Reserves | D | 0-0 |
| Japan NPB Reserve League | 2020/09/20 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 10-8 |
| Japan NPB Reserve League | 2020/09/19 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | D | 5-5 |
| Japan NPB Reserve League | 2020/07/24 04:30 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 4-3 |
| Japan NPB Reserve League | 2019/07/08 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 7-5 |
| Japan NPB Reserve League | 2019/06/23 04:00 | Seibu Lions Reserves v Yokohama Bay Stars Reserves | W | 0-4 |
| Japan NPB Reserve League | 2019/06/22 04:00 | Seibu Lions Reserves v Yokohama Bay Stars Reserves | D | 0-0 |
| Japan NPB Reserve League | 2019/06/21 02:00 | Seibu Lions Reserves v Yokohama Bay Stars Reserves | W | 1-10 |
| Japan NPB Reserve Exhibition | 2021/02/19 04:00 | Yokohama Bay Stars Reserves v Nipponham Fighters Reserves | W | 6-2 |
| Japan NPB Reserve League | 2020/11/27 03:30 | Chiba Lotte Marines Reserves v Yokohama Bay Stars Reserves | L | 10-4 |
| Japan NPB Reserve League | 2020/11/23 03:30 | Yokohama Bay Stars Reserves v Yakult Swallows Reserves | L | 1-5 |
| Japan NPB Reserve League | 2020/11/19 03:30 | Orix Buffaloes Reserves v Yokohama Bay Stars Reserves | L | 9-2 |
| Japan NPB Reserve League | 2020/11/17 03:30 | Hiroshima Carp Reserves v Yokohama Bay Stars Reserves | D | 0-0 |
| Japan NPB Reserve League | 2020/11/13 03:30 | Chunichi Dragons Reserves v Yokohama Bay Stars Reserves | L | 10-1 |
| Japan NPB Reserve League | 2020/09/29 09:00 | Seibu Lions Reserves v Yokohama Bay Stars Reserves | D | 0-0 |
| Japan NPB Reserve League | 2020/09/20 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 10-8 |
| Japan NPB Reserve League | 2021/03/24 04:00 | Yomiuri Giants Reserves v Seibu Lions Reserves | W | 1-2 |
| Japan NPB Reserve League | 2021/03/23 04:00 | Yomiuri Giants Reserves v Seibu Lions Reserves | W | 0-1 |
| Japan NPB Reserve League | 2020/11/29 02:00 | Seibu Lions Reserves v Hiroshima Carp Reserves | W | 2-0 |
| Japan NPB Reserve League | 2020/11/28 03:30 | Seibu Lions Reserves v Rakuten Eagles Reserves | D | 5-5 |
| Japan NPB Reserve League | 2020/11/27 03:30 | SoftBank Hawks Reserves v Seibu Lions Reserves | L | 3-2 |
| Japan NPB Reserve League | 2020/11/22 03:30 | Chiba Lotte Marines Reserves v Seibu Lions Reserves | L | 9-4 |
| Japan NPB Reserve League | 2020/11/21 03:30 | Seibu Lions Reserves v SoftBank Hawks Reserves | W | 6-5 |
| Japan NPB Reserve League | 2020/10/30 03:30 | Yomiuri Giants Reserves v Seibu Lions Reserves | D | 2-2 |