In Major League Baseball, the Rookie of the Year Award is annually given to one player from each league as voted on by the Baseball Writers Association of America (BBWAA). The award was established in 1940 by the Chicago chapter of the BBWAA, which selected an annual winner from 1940 through 1946. The award became national in 1947; Jackie Robinson, the Brooklyn Dodgers' first baseman, won the inaugural award. One award was presented for both leagues in 1947 and 1948; since 1949, the honor has been given to one player each in the National and American League. Originally, the award was known as the J. Louis Comiskey Memorial Award, named after the Chicago White Sox owner of the 1930s. The award was renamed the Jackie Robinson Award in July 1987, 40 years after Jackie Robinson broke the baseball color line.

Of the 128 players named Rookie of the Year, 14 have been elected to the National Baseball Hall of Fame—Jackie Robinson, five American League players, and eight others from the National League. The award has been shared twice: once by Butch Metzger and Pat Zachry of the National League in 1976; and once by John Castino and Alfredo Griffin of the American League in 1979. Members of the Brooklyn and Los Angeles Dodgers have won the most awards of any franchise (with 16), twice the total of the New York Yankees (eight), who have produced the most in the American League. Fred Lynn and Ichiro Suzuki are the only two players who have been named Rookie of the Year and Most Valuable Player in the same year, and Fernando Valenzuela is the only player to have won Rookie of the Year and the Cy Young Award in the same year. Sam Jethroe is the oldest player to have won the award, at age 32, 33 days older than 2000 winner Kazuhiro Sasaki (also 32).Craig Kimbrel of the Atlanta Braves and Jeremy Hellickson of the Tampa Bay Rays are the most recent winners.

K-League Rookie of the Year Award is newly established in 1985 that third season in K-League. Many star players were received this award such as Lee Dong-Gook, Lee Chun-Soo, and so on.

Major League Baseball (MLB) is a professional baseball league, consisting of teams that play in the American League and the National League. The two leagues merged in 2000 into a single organization led by the Commissioner of Baseball, after 100 years as separate legal entities.

MLB constitutes one of the major professional sports leagues of the United States and Canada. It is composed of 30 teams — 29 in the United States and 1 in Canada. With the International Baseball Federation, MLB also manages the World Baseball Classic. With an average attendance of 30,352 people per game, Major League Baseball has the fifth highest average attendance of any sports league behind the NFL, Bundesliga, AFL, and Premier League.

MLB is governed by the Major League Baseball Constitution that has undergone several incarnations since 1875 with the most recent revisions being made in 2012. Under the direction of the Commissioner of Baseball (currently Bud Selig), Major League Baseball hires and maintains the sport's umpiring crews, and negotiates marketing, labor, and television contracts.

Ryan Joseph Braun (born November 17, 1983, in Mission Hills, California) is an American right-handed Major League Baseball left fielder for the Milwaukee Brewers. A perennial standout, he was ranked No. 7 by the Sporting News in its 2012 list of the 50 greatest current players in baseball and is the reigning National League MVP.

Braun was a two-time All American baseball player at the University of Miami, where he was named "National Freshman of the Year" by Baseball America in 2003. The Brewers drafted him in the first round (fifth overall) in the 2005 major league draft. He was the team's Minor League Player of the Year in 2006.

Braun has led the National League (NL) twice in slugging percentage (in 2007, while setting the major league rookie record, and 2011), twice in extra-base hits (2008 and 2011), and once in hits (2009). On defense, he led all major league outfielders in fielding percentage in 2008, led NL left fielders in fielding percentage twice (2009 and 2011), and led NL left fielders in range factor in 2009. His 128 home runs through 2010 were the 8th-most by any major leaguer ever through their first four seasons. Through 2011, he was third among all active ballplayers in career slugging percentage, and first among active left fielders in career fielding percentage.

Michael Nelson Trout (born August 7, 1991 in Millville, New Jersey) is an American professional baseball outfielder for the Los Angeles Angels of Anaheim of Major League Baseball. He debuted with the Angels in 2011.

Trout was considered to be one of the top prospects in all of baseball and was named the second best overall prospect by Baseball America, during their midseason update in July 2010. Prior to the 2011 season, Trout was ranked #1 by ESPN's Keith Law in his 2011 top 100 prospects list. MLB's Jonathan Mayo also named Trout the #1 prospect in all of baseball during MLB Network's airing of MLB's Top 50 Prospects.

Trout's father, Jeff Trout, was a fifth round draft pick by the Minnesota Twins in 1983. Trout began playing baseball in Little League.

Trout attended Millville Senior High School in Millville, New Jersey. Initially a shortstop, Trout shifted to the outfield during his senior year. That year, he hit 18 home runs, a New Jersey high school record.

Trout committed to attend East Carolina University on a baseball scholarship. Though scouted by MLB teams, Trout was passed over by teams in the draft as players from New Jersey typically do not play baseball throughout the year, as they do in warmer states such as California, Texas, and Florida.