| Japan - NPB Reserve League | 2023/08/07 04:00 | Seibu Lions - Reserves v Nipponham Fighters - Reserves | D | 3-3 |
| Japan - NPB Reserve League | 2023/07/22 04:30 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | W | 12-2 |
| 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 | 2023/08/17 04:00 | Yomiuri Giants - Reserves v Nipponham Fighters - Reserves | W | 8-9 |
| Japan - NPB Reserve League | 2023/08/16 04:00 | Yomiuri Giants - Reserves v Nipponham Fighters - Reserves | W | 2-3 |
| Japan - NPB Reserve League | 2023/08/15 04:00 | Yomiuri Giants - Reserves v Nipponham Fighters - Reserves | L | 4-3 |
| Japan - NPB Reserve League | 2023/08/07 04:00 | Seibu Lions - Reserves v Nipponham Fighters - Reserves | D | 3-3 |
| Japan - NPB Reserve League | 2023/08/03 04:00 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | W | 6-7 |
| Japan - NPB Reserve League | 2023/08/02 04:00 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | W | 6-13 |
| Japan - NPB Reserve League | 2023/08/01 04:00 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | D | 4-4 |
| Japan - NPB Reserve League | 2023/07/22 04:30 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | W | 12-2 |
| Japan - NPB Reserve League | 2023/08/17 01:30 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | L | 3-2 |
| Japan - NPB Reserve League | 2023/08/16 01:30 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | L | 7-3 |
| Japan - NPB Reserve League | 2023/08/15 01:30 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | W | 2-4 |
| Japan - NPB Reserve League | 2023/08/07 04:00 | Seibu Lions - Reserves v Nipponham Fighters - Reserves | D | 3-3 |
| Japan - NPB Reserve League | 2023/08/03 09:00 | Chiba Lotte Marines - Reserves v Seibu Lions - Reserves | W | 1-5 |
| Japan - NPB Reserve League | 2023/07/30 04:00 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | L | 11-9 |
| Japan - NPB Reserve League | 2023/07/29 04:00 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | W | 8-10 |
| Japan - NPB Reserve League | 2023/07/25 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 5-3 |