Nippon Professional Baseball

Nippon Professional Baseball (日本野球機構, Nippon Yakyū Kikō) or NPB is the highest level of baseball in Japan. Locally, it is often called Puro Yakyū (プロ野球), meaning Professional Baseball. Outside Japan, it is often just referred to as "Japanese baseball". The roots of the league can be traced back to the formation of the "Greater Japan Tokyo Baseball Club" (大日本東京野球倶楽部, Dai-Nippon Tōkyō Yakyū Kurabu) in 1934 and the original Japanese Baseball League. NPB was formed when that league reorganized in 1950.

The league currently consists of two six-team circuits, the Central League and the Pacific League. Each season the winning clubs from the two leagues compete in the Japan Series, the championship series of NPB.

Prime Minister Shinzo Abe's ruling Liberal Democratic Party has proposed expanding NPB to 16 total teams by adding two expansion franchises in each of the country's top-tier professional baseball leagues. The goal of such a move would be to energize the economies of the regions receiving the new teams. Okinawa, Shizuoka, Shikoku, and Niigata have been identified as regions that could play host to said teams.

Professional baseball

Professional baseball is played in leagues throughout the world. In these leagues, and associated farm teams, baseball players are selected for their talents and are paid to play for a specific team or club system.

Modern professional leagues

Americas

United States and Canada

Major League Baseball in the United States and Toronto, Canada, consists of the National League (founded in 1876) and the American League (1901). Historically, teams in one league never played teams in the other until the World Series, in which the champions of the two leagues played against each other. This changed in 1997 with the advent of interleague play.

In addition to the major leagues, many North American cities and towns feature minor league teams. An organization officially styled Minor League Baseball, formerly the National Association of Professional Baseball Leagues, oversees nearly all minor league baseball in the United States and Canada. The minor leagues are divided into classes AAA, AA, High A, Low A, Short-Season A, Advanced Rookie, and Rookie. These minor-league divisions are affiliated with major league teams, and serve to develop young players and rehabilitate injured major-leaguers. The Mexican League is a Minor League Baseball member league that operates without affiliations to Major League teams. The phrase "Organized Baseball" is often applied as an umbrella term for all leagues — Major and minor — under the authority of the Commissioner of Baseball.