| Japan - NPB Reserve League | 2023/06/23 09:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | W | 2-1 |
| Japan - NPB Reserve League | 2023/06/08 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 4-2 |
| Japan - NPB Reserve League | 2023/06/07 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 6-4 |
| Japan - NPB Reserve League | 2023/06/06 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 5-1 |
| Japan - NPB Reserve League | 2023/05/12 04:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | L | 3-4 |
| Japan - NPB Reserve League | 2023/03/31 04:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | L | 2-12 |
| Japan - NPB Reserve League | 2022/09/30 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 0-4 |
| Japan - NPB Reserve League | 2022/09/13 04:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2023/06/23 09:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | W | 2-1 |
| Japan - NPB Reserve League | 2023/06/22 09:00 | Chiba Lotte Marines - Reserves v Yomiuri Giants - Reserves | L | 3-0 |
| Japan - NPB Reserve League | 2023/06/21 09:00 | Chiba Lotte Marines - Reserves v Yomiuri Giants - Reserves | L | 3-1 |
| Japan - NPB Reserve League | 2023/06/20 09:00 | Chiba Lotte Marines - Reserves v Yomiuri Giants - Reserves | W | 0-1 |
| Japan - NPB Reserve League | 2023/06/08 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 4-2 |
| Japan - NPB Reserve League | 2023/06/07 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 6-4 |
| Japan - NPB Reserve League | 2023/06/06 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 5-1 |
| Japan - NPB Reserve League | 2023/06/04 04:00 | Yomiuri Giants - Reserves v Nipponham Fighters - Reserves | L | 3-6 |
| Japan - NPB Reserve League | 2023/06/23 09:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | L | 2-1 |
| Japan - NPB Reserve League | 2023/06/22 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 12-3 |
| Japan - NPB Reserve League | 2023/06/21 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | W | 2-17 |
| Japan - NPB Reserve League | 2023/06/20 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | W | 2-3 |
| Japan - NPB Reserve League | 2023/06/10 04:00 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | L | 10-3 |
| Japan - NPB Reserve League | 2023/06/08 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 4-2 |
| Japan - NPB Reserve League | 2023/06/07 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 6-4 |
| Japan - NPB Reserve League | 2023/06/06 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 5-1 |