| Japan - NPB Reserve League | 2019/06/23 04:00 | Seibu Lions - Reserves v Yokohama Bay Stars - Reserves | W | 0-4 |
| Japan - NPB Reserve League | 2019/06/22 04:00 | Seibu Lions - Reserves v Yokohama Bay Stars - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2019/06/21 02:00 | Seibu Lions - Reserves v Yokohama Bay Stars - Reserves | W | 1-10 |
| Japan - NPB Reserve League | 2019/05/31 09:00 | Seibu Lions - Reserves v Yokohama Bay Stars - Reserves | W | 1-4 |
| Japan - NPB Reserve League | 2019/07/07 05:00 | Nipponham Fighters - Reserves v Yokohama Bay Stars - Reserves | L | 5-4 |
| Japan - NPB Reserve League | 2019/07/06 09:00 | Nipponham Fighters - Reserves v Yokohama Bay Stars - Reserves | W | 1-4 |
| Japan - NPB Reserve League | 2019/07/05 09:00 | Nipponham Fighters - Reserves v Yokohama Bay Stars - Reserves | W | 1-2 |
| Japan - NPB Reserve League | 2019/07/03 09:00 | Yomiuri Giants - Reserves v Yokohama Bay Stars - Reserves | L | 9-6 |
| Japan - NPB Reserve League | 2019/07/02 02:00 | Yomiuri Giants - Reserves v Yokohama Bay Stars - Reserves | L | 3-0 |
| Japan - NPB Reserve League | 2019/06/28 04:00 | Yokohama Bay Stars - Reserves v Chiba Lotte Marines - Reserves | L | 3-4 |
| Japan - NPB Reserve League | 2019/06/23 04:00 | Seibu Lions - Reserves v Yokohama Bay Stars - Reserves | W | 0-4 |
| Japan - NPB Reserve League | 2019/06/22 04:00 | Seibu Lions - Reserves v Yokohama Bay Stars - Reserves | D | 0-0 |
| Japan - NPB Reserve League | 2019/07/06 07:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 5-0 |
| Japan - NPB Reserve League | 2019/07/05 07:00 | Seibu Lions - Reserves v Yomiuri Giants - Reserves | W | 3-1 |
| Japan - NPB Reserve League | 2019/07/03 04:00 | Seibu Lions - Reserves v Nipponham Fighters - Reserves | W | 2-1 |
| Japan - NPB Reserve League | 2019/06/28 04:00 | Yakult Swallows - Reserves v Seibu Lions - Reserves | L | 4-3 |
| Japan - NPB Reserve League | 2019/06/27 04:00 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | W | 0-2 |
| Japan - NPB Reserve League | 2019/06/26 04:00 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | W | 5-6 |
| Japan - NPB Reserve League | 2019/06/25 04:00 | Rakuten Eagles - Reserves v Seibu Lions - Reserves | L | 5-1 |
| Japan - NPB Reserve League | 2019/06/23 04:00 | Seibu Lions - Reserves v Yokohama Bay Stars - Reserves | L | 0-4 |