Fielder who occupies a position in the infield. Most commonly refers to the first baseman, second baseman, third baseman, and shortstop.

A fielder in any of the four infield positions, not including the pitcher and catcher.

A fielder who occupies a position in the infield.

A fielder who occupies a position within the infield.

Baseball teams take turns, one "out" in the field and one "in" at bat. The nine fielding positions are commonly grouped as three outfielders, four infielders, and "the battery" (two). Meanwhile the team in at bat sends nine batters to home plate one by one in fixed batting order.