Wbc is the only national competition that allows professional stars of Major League Baseball to participate. Games such as the Olympic Games and the World Cup conflict with the major league season, and professional stars are not allowed to participate. Only wbc allows stars to play before the baseball season. Wbc is a game dominated by mlb. In order to ensure that the season will not be affected, many rules have been set, such as the pitcher's pitching limit, which cannot exceed 70 balls in the first round, and there are also restrictions in the second round and final. Also, if the players were on the disabled list for more than 15 days last season, the group has the right to force the players not to participate in the national team competition. However, compared with football, basketball and other world competitions, wbc players choose their nationality very loosely. You can decide to participate in a team competition because of your parents' nationality, your own nationality, grandparents' nationality and other nationalities, and you don't have to belong to your own nationality.