From the edition of October 1, 2026 Warm, curious, carefully sourced takes on the day's most interesting stories. Translate
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After a playoff pitch, ABS and replay check different calls

A ball-strike review and a tag review can involve the same play. Their permissions, order and extra-inning allowances stay separate.

A blank batting helmet, catcher’s mitt and baseball on a low table, beside two separate groups of small golden tokens.
A tiny helmet tap can give a whole ballpark its answer. Illustration: Joyful Take.

A tap on a batting helmet and a manager requesting replay can interrupt the same passage of play for different reasons. I think that distinction is the most useful thing to learn before treating every playoff challenge as one shared supply. One review checks a pitch. The other can check a tag.

The Automated Ball-Strike system, or ABS, entered MLB in 2026. It checks disputed ball-strike calls through pitch tracking, while human umpires make the initial calls. The league’s ABS announcement explains the player-initiated design, and Baseball Savant’s dashboard describes its current operation.

Start with two separate accounts

Which kind of challenge is on the screen

ABS
For a ball-strike call, requested by the batter, pitcher or catcher. Two to start, with successful challenges retained.
Replay review
For reviewable plays such as a tag. Managers start a postseason game with two challenges, rather than the regular-season one.
Extra innings
A team entering an extra inning with no ABS challenges receives one. This does not refill the manager’s replay account.

USA TODAY’s September 29, 2026 explainer, carried by AOL, confirms that ABS keeps its regular-season rules in October even though managers receive an additional opening replay challenge. Two separate accounts. That is the picture to keep in mind when a broadcast mentions a team being out of challenges, because the kind of challenge matters as much as the number remaining.

A player requests ABS by tapping his cap or helmet immediately, without instructions from the dugout. Losing an unsuccessful ABS challenge does not spend a replay challenge. Likewise, a disputed tag cannot be corrected by asking the pitch-tracking system whether the ball crossed the strike zone. The two systems have different jobs.

That separation is helpful when the camera switches between home plate and a base. The same pitch can produce both a ball-strike dispute and a question about a runner. It does not turn the two questions into one.

An invented steal makes the sequence clearer

Imagine a batter taking a pitch while a runner steals second. The umpire calls a strike. The runner is called out on the tag. When the batter believes the pitch was outside the zone and his team believes the runner reached the bag before the tag, the same few seconds of baseball have produced two disputes requiring different evidence.

The batter’s ABS request addresses the strike. A manager’s replay request addresses the out. MLB’s detailed ABS FAQ specifies the order: simultaneous requests put ABS first, and ABS cannot follow a completed replay review. Getting that sequence wrong could leave the ball-strike question unanswered even while the broadcast spends time examining the tag.

For the tag, video evidence matters. For the pitch, its tracked location matters. The MLB replay glossary describes three outcomes: overturn, confirm, or let the call stand on insufficient evidence. I would resist reading a pitch graphic as a verdict on the runner’s entire journey.

A new ball-strike verdict answers the pitch question. It does not itself show whether a glove touched a runner before his foot touched the bag. That is why the camera’s close-up of the tag still matters in our invented steal, regardless of how convincing the pitch animation looks. For an unusual live play, wait for the umpires’ announced outcome rather than making that animation carry an answer it does not show.

The tenth inning adds a precise safety net

If a team has no ABS challenges when an extra inning begins, it receives one. If it still has one, it does not receive a second merely because the inning is extra. The ABS announcement’s challenge rules make this a conditional replenishment, not an automatic bonus for everyone.

Here is an invented example. A team loses both ABS challenges during the first nine innings and enters the tenth with zero. It receives one. A successful challenge leaves that allowance intact, so a team can get its next call corrected without spending the one challenge that the extra-inning rule just restored. A failed challenge exhausts the supply again. At the start of another extra inning, the same zero-remaining condition applies. Counting successful reviews as spent challenges would give the wrong answer.

Meanwhile, playoff extra innings begin with empty bases: there is no automatic runner at second. MLB’s extra-innings guide confirms that rule. More innings do not mean a runner appears later. A challenge allowance and a baserunning allowance are different things, even when both explanations mention the tenth.

There is a charming real illustration of the pitch system’s stakes. On April 1, 2026, Baltimore catcher Samuel Basallo used a successful ABS challenge to secure the final out against Texas. AP described him adding a little body English during the review, then heading to the mound to hug Albert Suárez. That account turns a technical ruling into something warmer than a rectangle on a screen.

For me, that is the pleasure in understanding the machinery: the little helmet tap becomes a decision with a clear purpose. Check the kind of call, the person allowed to challenge it, and the remaining allowance. Then the pause on the broadcast becomes part of the baseball rather than a mystery between pitches.

Sources

Every factual claim above traces to one of these. Links open in a new tab.

  1. MLB announces ABS Challenge System coming to the Major Leagues beginning in the 2026 seasonMajor League Baseball, 2025-09-23.
  2. ABS Challenge DashboardBaseball Savant / MLB, Undated; accessed 2026-10-01.
  3. What are ABS challenge system rules for MLB playoffs?USA TODAY via AOL, 2026-09-29.
  4. Everything you need to know about the new ABS Challenge SystemMLB.com, 2026-04-13.
  5. Replay ReviewMLB.com, Undated; accessed 2026-10-01.
  6. How the extra-innings rules work in the playoffsMLB.com, 2024-10-29.
  7. Baltimore’s Samuel Basallo makes MLB’s first game-ending robo-ump challengeAssociated Press, 2026-04-01.