| 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 | 2019/06/28 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | W | 4-3 |
| Japan - NPB Reserve League | 2019/05/07 04:00 | Seibu Lions - Reserves v Yakult Swallows - Reserves | D | 5-5 |
| 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 | 2020/10/15 03:30 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | L | 0-1 |
| Japan - NPB Reserve League | 2020/10/14 03:30 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | W | 5-3 |
| Japan - NPB Reserve League | 2020/10/13 03:30 | Yakult Swallows - Reserves v Nipponham Fighters - Reserves | W | 6-4 |
| 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 | 2020/10/24 03:30 | Yakult Swallows - Reserves v Seibu Lions - Reserves | W | 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 | 2020/10/14 03:30 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | L | 10-1 |
| Japan - NPB Reserve League | 2020/10/13 03:30 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | D | 4-4 |
| Japan - NPB Reserve League | 2020/10/12 03:30 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | L | 7-2 |
| Japan - NPB Reserve League | 2020/10/08 03:30 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2020/10/07 03:30 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 11-5 |
| Japan - NPB Reserve League | 2020/10/06 03:30 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 11-2 |