| Japan - NPB Reserve League | 2020/09/12 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2020/09/11 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 5-7 |
| Japan - NPB Reserve League | 2020/08/23 04:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | W | 1-0 |
| Japan - NPB Reserve League | 2020/08/21 04:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2020/07/16 04:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | L | 2-4 |
| Japan - NPB Reserve League | 2020/07/15 04:00 | Yomiuri Giants - Reserves v Seibu Lions - Reserves | D | 3-3 |
| Japan - NPB Reserve League | 2019/07/06 07:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 5-0 |
| Japan - NPB Reserve League | 2019/07/05 07:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 3-1 |
| Japan - NPB Reserve League | 2020/10/01 04:00 | Rakuten Eagles - Reserves v Yomiuri Giants - Reserves | W | 2-4 |
| Japan - NPB Reserve League | 2020/09/30 04:00 | Rakuten Eagles - Reserves v Yomiuri Giants - Reserves | W | 4-6 |
| Japan - NPB Reserve League | 2020/09/29 04:00 | Rakuten Eagles - Reserves v Yomiuri Giants - Reserves | L | 12-5 |
| Japan - NPB Reserve League | 2020/09/20 04:00 | Rakuten Eagles - Reserves v Yomiuri Giants - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2020/09/19 04:00 | Rakuten Eagles - Reserves v Yomiuri Giants - Reserves | D | 10-10 |
| Japan - NPB Reserve League | 2020/09/12 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2020/09/11 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 5-7 |
| Japan - NPB Reserve League | 2020/09/10 04:00 | Nipponham Fighters - Reserves v Yomiuri Giants - Reserves | W | 5-6 |
| Japan - NPB Reserve League | 2020/09/29 09:00 | Seibu Lions - Reserves v Yokohama Bay Stars - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2020/09/20 04:00 | Yokohama Bay Stars - Reserves v Seibu Lions - Reserves | L | 10-8 |
| Japan - NPB Reserve League | 2020/09/19 04:00 | Yokohama Bay Stars - Reserves v Seibu Lions - Reserves | D | 5-5 |
| Japan - NPB Reserve League | 2020/09/17 04:00 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | D | 6-6 |
| Japan - NPB Reserve League | 2020/09/12 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2020/09/11 04:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | L | 5-7 |
| Japan - NPB Reserve League | 2020/09/02 03:56 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 6-5 |
| Japan - NPB Reserve League | 2020/09/01 04:00 | Nipponham Fighters - Reserves v Seibu Lions - Reserves | L | 6-4 |