Pool B of the First Round of the 2017 World Baseball Classic was held at Tokyo Dome, Tokyo, Japan from March 7 to 10, 2017, between Australia, China, Cuba and Japan.
Pool B was a round-robin tournament.
Each team played the other three teams once, with the top two teams advancing to Pool E. Two-time champions Japan concluded Pool B with a 3–0 record, whereas China lost all three games after their poor performances and must now qualify for the 2021 World Baseball Classic.
Cuba defeated Australia to advance to the second round.
[1] Pool B MVP: Yoshitomo Tsutsugoh