Jason Alias Heyward (born August 9, 1989), nicknamed "J-Hey" is an American professional baseball right fielder for the Chicago Cubs of Major League Baseball (MLB). Originally the Atlanta Braves' first-round selection in the 2007 MLB draft from Henry County High School in Georgia, he began his minor league career at age 17. Heyward soon became one of the top-rated prospects in all of baseball for batting, speed, and defense, and debuted in MLB as Atlanta's starting right fielder on Opening Day 2010. There, he played until being traded to the St. Louis Cardinals after the 2014 season. Standing 6 feet 5 inches (1.96 m) tall and weighing 245 pounds (111 kg), he throws and bats left-handed. He has worn uniform No. 22 throughout his major league career in honor of a high school friend and teammate who died in a traffic collision.
A three-time minor league All-Star game selection, Baseball America selected Heyward as the Braves' top overall prospect in 2007 and the organization's best power hitter; it cited Heyward as having the best strike zone discipline and excelling at multiple other skills. In 2009, he won a Minor League Player of the Year Award from both Baseball America and USA Today. That year, he batted .323 with 17 home runs (HR), 63 runs batted in (RBI), a .408 on-base percentage, and a .555 slugging percentage over 99 games. A consensus number-one MLB prospect entering the 2010 season, Baseball America, Keith Law of ESPN.com, and Jonathan Mayo of MLB.com all listed Heyward as baseball's top prospect.