| Japan - NPB Reserve League | 2023/07/21 09:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 0-1 |
| Japan - NPB Reserve League | 2023/06/22 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | W | 12-3 |
| Japan - NPB Reserve League | 2023/06/21 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 2-17 |
| Japan - NPB Reserve League | 2023/06/20 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 2-3 |
| Japan - NPB Reserve League | 2023/06/01 04:00 | Seibu Lions - Reserves v Nipponham Fighters - Reserves | L | 9-1 |
| Japan - NPB Reserve League | 2023/05/31 04:00 | Seibu Lions - Reserves v Nipponham Fighters - Reserves | L | 3-1 |
| Japan - NPB Reserve League | 2023/05/30 04:00 | Seibu Lions - Reserves v Nipponham Fighters - Reserves | L | 9-3 |
| Japan - NPB Reserve League | 2023/05/02 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | W | 11-3 |
| Japan - NPB Reserve League | 2023/07/21 09:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 0-1 |
| Japan - NPB Reserve League | 2023/07/10 04:00 | Rakuten Eagles - Reserves v Nipponham Fighters - Reserves | W | 5-8 |
| Japan - NPB Reserve League | 2023/06/29 04:00 | Chiba Lotte Marines - Reserves v Nipponham Fighters - Reserves | L | 8-4 |
| Japan - NPB Reserve League | 2023/06/28 04:00 | Chiba Lotte Marines - Reserves v Nipponham Fighters - Reserves | W | 5-7 |
| Japan - NPB Reserve League | 2023/06/27 04:00 | Chiba Lotte Marines - Reserves v Nipponham Fighters - Reserves | L | 2-1 |
| Japan - NPB Reserve League | 2023/06/25 04:00 | Yokohama Bay Stars - Reserves v Nipponham Fighters - Reserves | L | 7-3 |
| Japan - NPB Reserve League | 2023/06/24 04:00 | Yokohama Bay Stars - Reserves v Nipponham Fighters - Reserves | L | 12-1 |
| Japan - NPB Reserve League | 2023/06/23 04:00 | Yokohama Bay Stars - Reserves v Nipponham Fighters - Reserves | D | 3-3 |
| Japan - NPB Reserve League | 2023/07/21 09:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | W | 0-1 |
| Japan - NPB Reserve League | 2023/07/13 04:00 | Yokohama Bay Stars - Reserves v Seibu Lions - Reserves | D | 6-6 |
| Japan - NPB Reserve League | 2023/07/12 09:00 | Yokohama Bay Stars - Reserves v Seibu Lions - Reserves | W | 1-2 |
| Japan - NPB Reserve League | 2023/07/11 09:00 | Yokohama Bay Stars - Reserves v Seibu Lions - Reserves | W | 3-5 |
| Japan - NPB Reserve League | 2023/07/02 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 2-0 |
| Japan - NPB Reserve League | 2023/06/25 04:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | W | 2-3 |
| Japan - NPB Reserve League | 2023/06/24 04:30 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | W | 1-6 |
| Japan - NPB Reserve League | 2023/06/23 09:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | L | 2-1 |