| Japan - NPB Reserve League | 2021/07/22 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 2-3 |
| Japan - NPB Reserve League | 2021/07/20 08:45 | Yakult Swallows - Reserves v Seibu Lions - Reserves | W | 4-3 |
| Japan - NPB Reserve League | 2020/10/25 03:30 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 3-4 |
| Japan - NPB Reserve League | 2020/10/24 03:30 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 0-5 |
| Japan - NPB Reserve League | 2020/10/23 03:30 | Yakult Swallows - Reserves v Seibu Lions - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2020/08/30 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | W | 7-2 |
| Japan - NPB Reserve League | 2020/08/09 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 1-7 |
| Japan - NPB Reserve League | 2020/08/07 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 0-5 |
| Japan - NPB Reserve League | 2021/08/11 05:31 | Yakult Swallows - Reserves v Yomiuri Giants - Reserves | L | 1-4 |
| Japan - NPB Reserve League | 2021/08/09 07:00 | Yakult Swallows - Reserves v Yomiuri Giants - Reserves | W | 17-2 |
| Japan - NPB Reserve League | 2021/08/01 06:00 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | L | 6-9 |
| Japan - NPB Reserve League | 2021/07/31 04:00 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | W | 6-1 |
| Japan - NPB Reserve League | 2021/07/30 04:00 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | L | 2-6 |
| Japan - NPB Reserve League | 2021/07/22 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 2-3 |
| Japan - NPB Reserve League | 2021/07/20 08:45 | Yakult Swallows - Reserves v Seibu Lions - Reserves | W | 4-3 |
| Japan - NPB Reserve League | 2021/06/24 07:00 | Yakult Swallows - Reserves v Yomiuri Giants - Reserves | L | 0-3 |
| 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 | 2021/08/17 04:00 | Yokohama Bay Stars - Reserves v Seibu Lions - Reserves | W | 0-2 |
| Japan - NPB Reserve League | 2021/08/03 04:00 | Seibu Lions - Reserves v Nipponham Fighters - Reserves | L | 5-6 |
| Japan - NPB Reserve League | 2021/08/01 06:00 | Chiba Lotte Marines - Reserves v Seibu Lions - Reserves | L | 4-3 |
| Japan - NPB Reserve League | 2021/07/30 04:00 | Chiba Lotte Marines - Reserves v Seibu Lions - Reserves | D | 4-4 |
| Japan - NPB Reserve League | 2021/07/29 04:00 | Yokohama Bay Stars - Reserves v Seibu Lions - Reserves | W | 6-10 |