| 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 League | 2019/05/31 09:00 | Seibu Lions Reserves v Yokohama Bay Stars Reserves | W | 1-4 |
| Japan NPB Reserve League | 2020/09/19 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | D | 5-5 |
| Japan NPB Reserve League | 2020/09/02 03:56 | Yokohama Bay Stars Reserves v Chiba Lotte Marines Reserves | W | 5-4 |
| Japan NPB Reserve League | 2020/08/28 04:30 | Yokohama Bay Stars Reserves v Nipponham Fighters Reserves | L | 1-4 |
| Japan NPB Reserve League | 2020/08/22 09:00 | Chiba Lotte Marines Reserves v Yokohama Bay Stars Reserves | D | 0-0 |
| Japan NPB Reserve League | 2020/07/24 04:30 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 4-3 |
| Japan NPB Reserve League | 2020/07/22 07:00 | Yokohama Bay Stars Reserves v Yomiuri Giants Reserves | L | 1-6 |
| Japan NPB Reserve League | 2020/07/21 04:00 | Yokohama Bay Stars Reserves v Yomiuri Giants Reserves | W | 6-4 |
| Japan NPB Reserve League | 2020/07/03 04:00 | Yokohama Bay Stars Reserves v Nipponham Fighters Reserves | L | 4-5 |
| Japan NPB Reserve League | 2020/09/19 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | D | 5-5 |
| Japan NPB Reserve League | 2020/09/17 04:00 | Rakuten Eagles Reserves v Seibu Lions Reserves | D | 6-6 |
| Japan NPB Reserve League | 2020/09/12 04:00 | Seibu Lions Reserves v Yomiuri Giants Reserves | D | 0-0 |
| Japan NPB Reserve League | 2020/09/11 04:00 | Seibu Lions Reserves v Yomiuri Giants Reserves | L | 5-7 |
| Japan NPB Reserve League | 2020/09/02 03:56 | Nipponham Fighters Reserves v Seibu Lions Reserves | L | 6-5 |
| Japan NPB Reserve League | 2020/09/01 04:00 | Nipponham Fighters Reserves v Seibu Lions Reserves | L | 6-4 |
| Japan NPB Reserve League | 2020/08/30 04:00 | Yakult Swallows Reserves v Seibu Lions Reserves | L | 7-2 |
| Japan NPB Reserve League | 2020/08/23 04:00 | Yomiuri Giants Reserves v Seibu Lions Reserves | L | 1-0 |