No. MLB does not use the automatic runner in extra innings during the 2026 postseason. When a playoff game is tied after nine innings, the 10th starts with the bases empty and no outs. Every later extra half-inning begins the same way until the game is decided. MLB's current postseason FAQ confirms that the regular-season runner-on-second rule is not used in the playoffs.
After a tie through nine innings, the visiting team bats first in the top of the 10th. It starts with no one on base. The home team bats in the bottom half if the game is still tied; if the home team takes the lead in that inning, the game can end there. If neither team settles the tie, the game moves to the 11th, which also begins with empty bases.
That setup continues throughout MLB postseason extra innings. There is no automatic runner carried over from the ninth and no player is placed at second just because an extra inning has begun. The same rule applies in the Wild Card Series, Division Series, League Championship Series, and World Series; MLB does not specify a different automatic-runner setup for one playoff round.
In practical terms, the first batter of each extra half-inning comes to the plate with the bases empty and no outs. A runner can appear later by reaching base during that half-inning, but the inning itself does not begin with a scoring opportunity already in place.
The main source of confusion is that MLB uses a different extra innings rule in regular-season games. In the regular season, every half-inning after the ninth begins with an automatic runner on second base. That runner is absent in the postseason.
| Situation | MLB regular season | MLB postseason in 2026 |
|---|---|---|
| Start of the 10th inning | Runner placed on second; no outs | Bases empty; no outs |
| Start of later extra innings | Runner placed on second in each half-inning | Bases empty in each half-inning |
| Runner's identity | Set by batting-order position, or a pinch-runner | No automatic runner |
| If that runner scores | Counts for the team, but is not charged as an earned run to the pitcher | Not applicable; no runner is placed automatically |
MLB's official Automatic Runner glossary defines the regular-season rule and limits it to regular-season games. For example, if the No. 7 hitter is due to lead off the 10th, the player in the No. 6 spot—or a pinch-runner for that player—starts on second.
“The last out starts on second” is a familiar shorthand, but MLB's formal definition is more precise: the runner is the player in the batting order immediately before that half-inning's leadoff hitter, or a substitute pinch-runner. The batting-order rule is the better reference if an unusual play makes “last out” confusing. This identity rule matters only in regular-season extra innings; there is no corresponding runner selection in playoff games.
MLB first introduced the automatic runner in 2020, then the Joint Competition Committee made it a permanent part of the rulebook before the 2023 season. In that context, “permanent” means the rule remains part of regular-season play. It does not extend the rule to October. MLB's 2026 postseason FAQ states that the automatic runner is not used in the postseason, while the glossary specifies that the runner-on-second rule applies only to regular-season games.
For that reason, a viewer should not apply the regular-season format to a playoff broadcast just because the rule is now permanent. The current scope is straightforward: regular-season extras start with a runner on second; postseason extras start with the bases empty.
The placement of a runner does not add a run to the scoreboard by itself. In a regular-season game, the team still has to bring that runner home. If the automatic runner scores, the run counts in the team's total but MLB does not charge it as an earned run to the pitcher. “Unearned” describes the pitcher's earned-run record; it does not mean the run is ignored in the game's score.
This scoring distinction does not change the 2026 playoff answer. Because MLB does not place an automatic runner in postseason extras, there is no automatic-runner earned-run treatment to apply in those innings.
With a regular-season runner already in scoring position, a team can decide whether to bunt, try to move the runner to third, or swing for a hit that brings the runner home. In postseason extras, the offense first has to get someone aboard. A sacrifice bunt can still be used after a batter reaches base, but it is not a way to advance a runner who was automatically put on second before the inning began.
The empty-base start also changes the context for the defense. Fielders do not have to begin the half-inning protecting a runner at second, and pitchers can open the inning without an automatic baserunner in scoring position. A leadoff home run with the bases empty scores one run; a leadoff out leaves the bases empty with one out. Those plays can still decide a game, but the rule does not guarantee that either team will score in an extra inning.
Before the first pitch of a postseason extra half-inning, the bases should be empty. If a runner appears after the inning starts, that player reached base through the game—for example, on a hit, walk, error, or another live-ball play. A runner does not carry over from the previous inning.
If a broadcast graphic seems to show a runner already at second before the half-inning begins, check that the graphic is current and that it is showing an MLB postseason game rather than a replay or a different competition. The automatic-runner procedure is not universal across every baseball league or tournament, so a non-MLB event may use a different rulebook.
MLB's 2026 postseason format FAQ says the regular-season automatic runner is not used in the postseason. The Automatic Runner glossary explains which player is placed on second during regular-season extras and how a run by that runner is recorded. MLB's rules index links to the 2026 Official Rules.
Quick answer: MLB postseason extra innings in 2026 do not use an automatic runner. The 10th and every later extra half-inning begin with the bases empty and no outs; the runner-on-second rule applies only during the regular season.
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