Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Kelvin Herrera (born December 31, 1989) is a Major League Baseball pitcher for the Kansas City Royals. Herrera along with Will Myers represented the Royals at the 2011 All-Star Futures Game. Herrera was called up to the majors for the first time on September 21, 2011. Major League Baseball (MLB) is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League. The two leagues merged in 2000 into a single MLB organization led by the Commissioner of Baseball after 100 years as separate legal entities.