Pool A of the First Round of the 2006 World Baseball Classic was held at Tokyo Dome, Tokyo, Japan from March 3 to 5, 2006.
Pool A was a round-robin tournament. Each team played the other three teams once, with the top two teams advancing to Pool 1.
NOTE: Tiebreaker notes: HTH − Head-to-head. RA − Runs against. IPD − Innings the team pitched. RA/9 − The index of (RA*9)/IPD.