| 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 | 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 | 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 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 | 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 |
| Japan - NPB Reserve League | 2021/07/23 07:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 9-4 |
| Japan - NPB Reserve League | 2021/07/22 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | W | 2-3 |
| Japan - NPB Reserve League | 2021/07/20 08:45 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 4-3 |
| Japan - NPB Reserve League | 2021/07/05 08:45 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | W | 6-8 |
| Japan - NPB Reserve League | 2021/06/17 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 2-1 |
| Japan - NPB Reserve League | 2021/04/22 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 0-14 |