| Japan NPB Reserve League | 2021/08/17 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | L | 0-2 |
| Japan NPB Reserve League | 2021/07/29 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | L | 6-10 |
| Japan NPB Reserve League | 2021/07/28 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 8-2 |
| Japan NPB Reserve League | 2021/03/26 03:54 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | L | 6-8 |
| 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 | 2021/08/17 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | L | 0-2 |
| Japan NPB Reserve League | 2021/07/31 07:00 | Yokohama Bay Stars Reserves v Yomiuri Giants Reserves | L | 2-4 |
| Japan NPB Reserve League | 2021/07/30 07:00 | Yokohama Bay Stars Reserves v Yomiuri Giants Reserves | D | 3-3 |
| Japan NPB Reserve League | 2021/07/29 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | L | 6-10 |
| Japan NPB Reserve League | 2021/07/28 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 8-2 |
| Japan NPB Reserve League | 2021/07/12 04:00 | Yokohama Bay Stars Reserves v Nipponham Fighters Reserves | L | 0-9 |
| Japan NPB Reserve League | 2021/06/24 04:00 | Yokohama Bay Stars Reserves v Nipponham Fighters Reserves | L | 2-3 |
| Japan NPB Reserve League | 2021/03/26 03:54 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | L | 6-8 |
| Japan NPB Reserve League | 2021/08/17 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 0-2 |
| Japan NPB Reserve League | 2021/08/03 04:00 | Seibu Lions Reserves v Nipponham Fighters Reserves | L | 5-6 |
| Japan NPB Reserve League | 2021/08/01 06:00 | Chiba Lotte Marines Reserves v Seibu Lions Reserves | L | 4-3 |
| Japan NPB Reserve League | 2021/07/30 04:00 | Chiba Lotte Marines Reserves v Seibu Lions Reserves | D | 4-4 |
| Japan NPB Reserve League | 2021/07/29 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 6-10 |
| Japan NPB Reserve League | 2021/07/28 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | L | 8-2 |
| Japan NPB Reserve League | 2021/07/25 07:00 | Seibu Lions Reserves v Yomiuri Giants Reserves | W | 5-2 |
| Japan NPB Reserve League | 2021/07/24 07:00 | Seibu Lions Reserves v Yomiuri Giants Reserves | L | 2-3 |