Find the best baseball lessons, classes, and instructors at HeyKiki and learn how to play baseball. Baseball is a sport played by two teams of 9 players each on a field with three bases and a home plate, arranged in a diamond shape. Teams score runs by hitting a thrown ball with a bat and touching each of four bases. Batting teams take turns hitting balls thrown by the pitcher of the fielding team, whose goal is to keep the batting team from scoring in a variety of ways. Baseball is the national sport of the USA, and has become widely popular in parts of Central and South America, East Asia, and the Caribbean.