| Japan - NPB - Reserveliga | 2021/08/20 04:00 | Seibu Lions - Reserve v Nipponham Fighters - Reserve | W | 3-4 |
| Japan - NPB - Reserveliga | 2021/08/03 04:00 | Seibu Lions - Reserve v Nipponham Fighters - Reserve | W | 5-6 |
| Japan - NPB - Reserveliga | 2021/07/05 08:45 | Nipponham Fighters - Reserve v Seibu Lions - Reserve | L | 6-8 |
| Japan - NPB - Reserveliga | 2021/06/17 04:00 | Nipponham Fighters - Reserve v Seibu Lions - Reserve | W | 2-1 |
| Japan - NPB - Reserveliga | 2020/10/08 03:30 | Nipponham Fighters - Reserve v Seibu Lions - Reserve | D | 0-0 |
| Japan - NPB - Reserveliga | 2020/10/07 03:30 | Nipponham Fighters - Reserve v Seibu Lions - Reserve | W | 11-5 |
| Japan - NPB - Reserveliga | 2020/10/06 03:30 | Nipponham Fighters - Reserve v Seibu Lions - Reserve | W | 11-2 |
| Japan - NPB - Reserveliga | 2020/09/02 03:56 | Nipponham Fighters - Reserve v Seibu Lions - Reserve | W | 6-5 |
| Japan - NPB - Reserveliga | 2021/08/28 04:00 | Rakuten Eagles - Reserve v Nipponham Fighters - Reserve | W | 5-6 |
| Japan - NPB - Reserveliga | 2021/08/27 04:30 | Rakuten Eagles - Reserve v Nipponham Fighters - Reserve | W | 2-3 |
| Japan - NPB - Reserveliga | 2021/08/20 04:00 | Seibu Lions - Reserve v Nipponham Fighters - Reserve | W | 3-4 |
| Japan - NPB - Reserveliga | 2021/08/17 04:00 | Orix Buffaloes - Reserve v Nipponham Fighters - Reserve | W | 1-6 |
| Japan - NPB - Reserveliga | 2021/08/13 04:00 | Yomiuri Giants - Reserve v Nipponham Fighters - Reserve | W | 2-3 |
| Japan - NPB - Reserveliga | 2021/08/03 04:00 | Seibu Lions - Reserve v Nipponham Fighters - Reserve | W | 5-6 |
| Japan - NPB - Reserveliga | 2021/08/01 06:00 | Yakult Swallows - Reserve v Nipponham Fighters - Reserve | W | 6-9 |
| Japan - NPB - Reserveliga | 2021/07/31 04:00 | Yakult Swallows - Reserve v Nipponham Fighters - Reserve | L | 6-1 |
| Japan - NPB - Reserveliga | 2021/08/26 04:00 | Yakult Swallows - Reserve v Seibu Lions - Reserve | W | 3-8 |
| Japan - NPB - Reserveliga | 2021/08/25 04:00 | Yakult Swallows - Reserve v Seibu Lions - Reserve | L | 4-0 |
| Japan - NPB - Reserveliga | 2021/08/24 04:00 | Yakult Swallows - Reserve v Seibu Lions - Reserve | L | 13-1 |
| Japan - NPB - Reserveliga | 2021/08/20 04:00 | Seibu Lions - Reserve v Nipponham Fighters - Reserve | L | 3-4 |
| Japan - NPB - Reserveliga | 2021/08/19 04:00 | Yokohama Bay Stars - Reserve v Seibu Lions - Reserve | W | 8-9 |
| Japan - NPB - Reserveliga | 2021/08/18 04:00 | Yokohama Bay Stars - Reserve v Seibu Lions - Reserve | L | 13-1 |
| Japan - NPB - Reserveliga | 2021/08/17 04:00 | Yokohama Bay Stars - Reserve v Seibu Lions - Reserve | W | 0-2 |
| Japan - NPB - Reserveliga | 2021/08/03 04:00 | Seibu Lions - Reserve v Nipponham Fighters - Reserve | L | 5-6 |