Editing Baseball field (section)

====First base====
{{main|First baseman}}
[[File:Chris Davis, Kevin Pillar (34422505340).jpg|thumb|right|[[Kevin Pillar]] of the [[Toronto Blue Jays]] reaches first base safely as Chris Davis of the [[Baltimore Orioles]] attempts to scoop a bouncing ball thrown by one of the other infielders during a game in May 2017.]] 
First base is the first of the four bases that must be touched by a runner in order to score a run for the batting team. The runner may continue running past first base in a straight line without being in jeopardy of being put out, so long as they make contact with first base and make no move or attempt to advance to second base.

The first baseman is the defensive player mainly responsible for the area near first base. In some youth leagues and adult recreational leagues, a "double first base" or "safety first base" is used. A double first base is rectangular (rather than square), measuring 30 by 15 inches. It is normally colored white and orange (two 15 by 15 inches squares). It is placed with the white half in fair territory and the orange half in foul territory. The white half is used by the first baseman to make plays while the orange half is used by the runner. This creates a separation between the first baseman and runner, reducing the chance of injury on plays at first base.

In the [[Baseball scorekeeping|numbering system]] used to record defensive plays, the first baseman is assigned the number 3.