| Japan NPB Reserve League | 2021/09/04 04:00 | Seibu Lions Reserves v Yomiuri Giants Reserves | W | 7-4 |
| 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 | 2021/04/22 04:00 | Seibu Lions Reserves v Yomiuri Giants Reserves | L | 0-14 |
| 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 | 2020/10/30 03:30 | Yomiuri Giants Reserves v Seibu Lions Reserves | D | 2-2 |
| Japan NPB Reserve League | 2021/09/04 04:00 | Seibu Lions Reserves v Yomiuri Giants Reserves | W | 7-4 |
| Japan NPB Reserve League | 2021/09/01 03:55 | Nipponham Fighters Reserves v Seibu Lions Reserves | W | 10-11 |
| Japan NPB Reserve League | 2021/08/26 04:00 | Yakult Swallows Reserves v Seibu Lions Reserves | W | 3-8 |
| Japan NPB Reserve League | 2021/08/25 04:00 | Yakult Swallows Reserves v Seibu Lions Reserves | L | 4-0 |
| Japan NPB Reserve League | 2021/08/24 04:00 | Yakult Swallows Reserves v Seibu Lions Reserves | L | 13-1 |
| Japan NPB Reserve League | 2021/08/20 04:00 | Seibu Lions Reserves v Nipponham Fighters Reserves | L | 3-4 |
| Japan NPB Reserve League | 2021/08/19 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | W | 8-9 |
| Japan NPB Reserve League | 2021/08/18 04:00 | Yokohama Bay Stars Reserves v Seibu Lions Reserves | L | 13-1 |
| Japan NPB Reserve League | 2021/09/04 04:00 | Seibu Lions Reserves v Yomiuri Giants Reserves | L | 7-4 |
| Japan NPB Reserve League | 2021/08/18 07:00 | Chiba Lotte Marines Reserves v Yomiuri Giants Reserves | W | 1-10 |
| Japan NPB Reserve League | 2021/08/17 07:00 | Chiba Lotte Marines Reserves v Yomiuri Giants Reserves | W | 0-2 |
| Japan NPB Reserve League | 2021/08/13 04:00 | Yomiuri Giants Reserves v Nipponham Fighters Reserves | L | 2-3 |
| Japan NPB Reserve League | 2021/08/11 05:31 | Yakult Swallows Reserves v Yomiuri Giants Reserves | W | 1-4 |
| Japan NPB Reserve League | 2021/08/09 07:00 | Yakult Swallows Reserves v Yomiuri Giants Reserves | L | 17-2 |
| Japan NPB Reserve League | 2021/07/31 07:00 | Yokohama Bay Stars Reserves v Yomiuri Giants Reserves | W | 2-4 |
| Japan NPB Reserve League | 2021/07/30 07:00 | Yokohama Bay Stars Reserves v Yomiuri Giants Reserves | D | 3-3 |