Pool A Pool A of the First Round of the 2017 World Baseball Classic was held at
Gocheok Sky Dome,
Seoul,
South Korea from March 6 to 10, 2017, between
Team Israel, the
Netherlands,
South Korea, and
Taiwan. Pool A was a
round-robin tournament. Prior to the start of the tournament,
ESPN considered Team Israel, ranked 41st in the world, to be the biggest underdog in the tournament, referring to them as the "
Jamaican bobsled team of the WBC". Team Israel (3–0) and Team Netherlands (2–1) qualified for the second round, in Japan. Israel became the first baseball team to go undefeated in the first round of the WBC's main draw after entering the main draw by winning in a qualifying round. In what NBC reported was thought to be the tallest batter-pitcher matchup in baseball history, the Dutch team's
Loek van Mil walked Israel's
Nate Freiman. Israel's catcher,
Ryan Lavarnway, was named Pool A MVP, after going 5-for-9 (.556/.692/.889), with four walks, a home run, and three RBIs.
Pool B Two-time champion
Japan concluded Pool B with a 3–0 record.
Cuba defeated
Australia to advance to the second round. In the first round, after batting .364, Japanese outfielder
Yoshitomo Tsutsugoh was named the Pool B MVP.
Pool C After falling behind 5–0 in the sixth inning,
Dominican Republic rallied to defeat the
U.S. 7–5 in their second game. On the last day of the pool,
Colombia tied their game against Dominican Republic 3–3 in the eighth on a
Jorge Alfaro home run, and had a chance to win in the ninth inning, but
Oscar Mercado was called out at home trying to score on a
sacrifice fly. The game continued into extra innings, where Dominican Republic scored 7 runs in the 11th to win and finish the pool undefeated. The U.S. then took an early lead on
Canada, winning 8–0 to claim the second berth in San Diego.
Manny Machado of the Dominican Republic was named MVP for the first-round Pool C bracket of the WBC, after batting .357.
Pool D ;Tiebreaker game While Puerto Rico cruised in all three of its games, the fight for the other three places was extremely tight. Italy scored 5 runs in the bottom of the 9th inning to shock Mexico in the first game, then lost an extra-inning slugfest against Venezuela. In the final game, Mexico defeated Venezuela in another slugfest and thought they had scored enough runs to advance on tiebreakers, As specified in the rules, Mexico was eliminated by the tiebreaker calculation and a tiebreaker game was played between Italy and Venezuela, which Venezuela won with a 9th-inning rally. According to the rules as announced at the time, Mexico's last-place finish would have required it to participate in a qualifying tournament in order to re-qualify for the
2021 World Baseball Classic. However, MLB announced in 2020 that the field of teams for the 2021 WBC would be expanded, with all 2017 WBC participants qualifying automatically and four new teams coming from qualifying tournaments. ==Second round==