Following the All-Star Series held on 16–17 July, the regular season went on hiatus in preparation for the 2020 Summer Olympics baseball tournament.
In the postseason, the Tokyo Yakult Swallows defeated the Orix Buffaloes in the Japan Series.
Chiba Lotte Marines won the series, 1−0−1 as a higher seed.
Tokyo Yakult Swallows won the series, 3−0−1 as a higher seed.
Orix Buffaloes won the series, 3−0−1 as a higher seed.