GUIDES · BETSLIP DOCTOR
Does running on the dirt left of the foul line automatically make an MLB batter-runner out at first?
No. Rule 5.09(a)(11) is not an automatic out for using the dirt inside the foul line. It concerns a batter-runner in the last half of the run to first who leaves the marked lane in a prohibited way and, in the umpire’s judgment, interferes with the fielder taking the throw. The Comment includes dirt inside the foul line in the permitted area and checks both feet at the later of two timing points: reaching the last half of the distance or the throw being released. Avoiding a fielder who is fielding the batted ball is a separate exception.
For Fans and players trying to understand why a batter-runner on the infield side of the foul line is not automatically called out. · Updated
Where the first-base lane rule applies
Rule 5.09(a)(11) concerns the batter-runner’s run to first while the ball is being fielded to that base. It addresses the last half of the distance from home to first. The marked three-foot lane and its chalk lines are part of the lane; the 2026 Comment also recognizes the dirt inside, or to the left of, the foul line as permitted running space.
That dirt allowance does not make every route across the infield harmless. The rule still asks whether the runner’s route and the contact or hindrance interfered with the fielder taking the throw to first.
The call needs the stated interference
Being on the infield side of the foul line is not, by itself, the complete out. The rule requires the runner to be outside the specified lane or on the infield grass inside the foul line in the covered part of the run, and the umpire must judge that this interfered with the fielder taking the throw.
The rule separately permits running outside the lane or inside the foul line on the infield grass to avoid a fielder attempting to field the batted ball. That exception is about avoiding the fielder fielding the ball, not a general substitute for the lane test.
How the Comment checks the runner’s feet
The Comment says both feet must be within the three-foot lane, on its chalk lines, or on the dirt inside the foul line. It treats the runner as compliant if both feet are in one of those areas after reaching the last half of the distance or after the fielder releases the throw to first, whichever happens later. The rule remains tied to the throw and the interference judgment; this is not the separate three-foot path rule for avoiding a tag.
A fictional throw to first
In a fictional play, Mira runs to first as the first baseman receives a throw. After the later timing point in the Comment, both of Mira’s feet are on the permitted dirt inside the foul line, and she does not hinder the fielder taking the throw. Being left of the foul line does not make her automatically out. In a separate branch, Kai runs outside the permitted lane and hinders the first baseman taking the throw; the umpire must still make the rule’s interference judgment. If Kai instead leaves the corridor to avoid a fielder trying to field the batted ball, that is the stated exception. These are rule illustrations, not rulings on a real play.
Related questions
Is a batter-runner automatically out for running on dirt inside the foul line?
No. The Comment includes dirt inside the foul line among the permitted areas. The out requires the rule’s location and timing conditions plus interference with the fielder taking the throw.
Is this the same as leaving the base path to avoid a tag?
No. This rule is about a batter-runner’s lane while a throw is being fielded at first. A tag attempt uses a separate base-path rule.