Baseball has outfielders and infielders.

An infielder is a baseball player who plays on the infield, the dirt portion of a baseball diamond between first base and third base. The infield defensive positions are first baseman, second baseman, shortstop and third baseman. Pitchers and catchers are often considered distinct from infielders even though they play on the infield; they are sometimes described jointly as the battery. The other 3 players on defense are commonly called outfielders. They generally position themselves beyond the bases.

Utility infielders are bench players who can play at least two infield positions. They are often weak hitters but skilled fielders, who enter the game in the late innings as defensive substitutes.

Among infielders, shortstops are generally the best fielders, followed by second basemen, third basemen, and first basemen, respectively. First basemen are generally required to be very talented as many throws are aimed to the runner (at first base). Conversely, more first and third basemen are good hitters than second basemen and shortstops. Second basemen and shortstops are referred to as "Middle Infielders," while third basemen and first baseman are called "Corner Infielders", or simply the "corners".

Almost all infielders throw right handed because of the angle and momentum used in throwing around the infield (especially first base). First basemen are often the only exception where a left-handed thrower is found in the infield.

In racing sports, the infield is the area in the center of a racetrack, often used as the spectator area.

Baseball positions

内野手 | 內野手