A highly complex game played between two teams of nine players, baseball has only one simple part: the winning team is the one which scores the most runs in, normally, a 9-innings match. The baseball playing field consists of an infield (incorporating the 'diamond' which covers the 3 field bases and home base) and an outfield. The diamond must be 27.5 metres square, and under the rules the nearest boundary must be a minimum of 76 metres from the apex of the diamond. In the United States, the professional rules insist on a 99-metre minimum for grounds constructed after 1958.
The baseball bat has a diameter of not more than seven centimetres at its thickest point and must not exceed 107 cm in length. The ball, thrown from a distance of 18.m by the pitcher, is made from white horsehide sewn over a sphere of rubber or cork, has a diameter of 22.9 - 23.5 cm, and weighs 142-149 grams.
A side scores a run when one player covers the 3 infield bases and safely reaches home base. 'Home run' is the term used to describe a batter hitting the ball, either out of the ground and inside the foul lines or far enough to cause fieldsmen problems, and covering the 3 bases and reaching home base. A grand-slam-homer, which counts for 4 runs, is scored when the batter, and 3 players already safely on base, all safely reach home base.
The United States is the world's 'home of baseball' but the sport is played in over 100 countries around the world and solidly entrenched in Canada, South America, and the Far East, especially so in Japan, the Philippines and Korea, and of course in Australia.