### Instruction: What is 2023 World Baseball Classic?
### Response: The 2023 World Baseball Classic (WBC) was an international professional baseball tournament and the fifth iteration of the World Baseball Classic. It began on March 8, 2023 and ran until March 21.

It was originally scheduled to take place in 2021, four years after the previous event, but was canceled in May 2020, as a result of the COVID-19 pandemic. It was later announced that qualifications for the Classic would start in September 2022, as agreed by Major League Baseball (MLB) and the Major League Baseball Players Association (MLBPA). The tournament expanded from 16 to 20 national teams, with all teams that participated in the 2017 edition automatically qualifying, plus four additional spots. Unlike in 2009, 2013 and 2017, the U.S. lineup attracted some distinguished players and attracted much hype for the tournament.

Japan won their record-extending third title after defeating defending champions United States 3–2 in the championship game, becoming the second team since the Dominican Republic in the 2013 World Baseball Classic to win the WBC with an undefeated record. Shohei Ohtani was named the World Baseball Classic Most Valuable Player.