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Will the Boston Red Sox beat the New York Yankees on 5 September 2026?

Resolution: Updated:

In short

The market treats a Boston win as all but settled, which is a striking level for a single baseball game that has not yet been played. Almost all of the money sits on one venue, and there is no second venue pricing the same question to test that level against. A genuine pre-game price for one MLB fixture almost never reaches this territory, so anything that returns two-sided interest to the market — a confirmed starting pitcher, a lineup change, a weather-driven postponement — would matter more than the underlying baseball.

Editorial illustration for: Will the Boston Red Sox beat the New York Yankees on 5 September 2026?

How the contract works

A contract on an outcome settles at $1 if that outcome happens and at nothing if it does not. The price is simply what buyers and sellers currently agree the chance is, expressed as a number between zero and one: a contract trading at 0.30, for example, would mean the market thinks the outcome happens about three times in ten. Here the outcome settled is the winner of the scheduled Red Sox–Yankees game on 5 September 2026, taken from official MLB final statistics. If the game is postponed, the market stays open until it is played; if it is cancelled with no make-up game, or ends without a winner, it settles 50-50 between the two sides. A position can normally be sold before settlement at whatever the price is at that moment, rather than held to the end.
What the market thinks happens
$100
Yes99%

The event happens

Costs now
$0.99
If you put in $100
$101
No1%

The event does not happen

Costs now
$0.01
If you put in $100
$10,000

Probability

History starts collecting once the event is tracked

How the price has moved

The data available for this market shows a consensus of 99% across venues and a market-implied probability of 100% on the only venue trading it, on $1,312,817 of volume. No opening level, daily move or weekly move is available, so there is no record here of the price changing its mind — and with a single venue there is no spread between markets to read either. What can be said plainly is that the market is priced as though the question were effectively closed, and that this level follows no single publicly reported trigger in the baseball itself. Any genuine repricing would most likely arrive with confirmed starting pitchers in the 24 to 48 hours before the game.

Analysis

Context

The Boston Red Sox and New York Yankees are the two oldest and most heavily followed rivals in the American League East. They have met more than 2,000 times since the early years of the twentieth century, and the rivalry has produced some of the sport's best-known moments: the Red Sox coming back from three games down to beat the Yankees in the 2004 American League Championship Series, and Boston eliminating New York in the 2018 Division Series. A game on 5 September 2026 falls in the final month of the regular season. Since 2022 each league sends six teams to the postseason — three division winners and three wild cards — which means September head-to-head games between AL East clubs carry double weight: a win adds to one team's record and subtracts from a direct rival's. Tiebreakers in the current format are decided by head-to-head record first, so meetings like this one can settle seeding without a playoff. This market asks only one thing: which club wins that scheduled game. It is not about the season series, the division, or the postseason. The result is taken from official MLB records once the game is complete.
The headline figure is the thing that needs explaining. Consensus across venues stands at 99%, and the single venue trading it, Polymarket, shows a market-implied probability of 100% with $1,312,817 of volume. For context, a single Major League Baseball game is one of the least predictable events in major professional sport. Even a dominant team facing a weak one with a clear pitching advantage rarely prices beyond about 70%, and most matchups between comparable clubs sit somewhere between 40% and 60%. A price at or near certainty is therefore not a statement about Boston's roster; no baseball analysis supports that level a week before the first pitch. What such a level usually reflects is the absence of anyone taking the other side. With one venue carrying the entire $1,312,817 of volume, there is no cross-venue spread to read — no second price to say whether the level is a consensus or an artefact of a single order book. When two or three venues price the same fixture, gaps of a few points are normal and informative: they show where the disagreement lives. Here there is nothing to compare against, so the number carries less information than its precision suggests. The baseball underneath is genuinely uncertain. Neither club's starting pitcher for 5 September 2026 is knowable this far out; rotations move with rest days, doubleheaders and injuries, and in September contending teams also manage workloads with the postseason in mind. Bullpen availability after the preceding games matters as much as the starter. Late-season roster decisions cut both ways: a team out of contention rests veterans, a team fighting for a wild card spot does the opposite. The settlement rules add two specific paths that do not depend on either team playing well. Early September weather in the northeast can force postponements, and MLB routinely resolves those with a make-up date or a doubleheader — in which case this market simply stays open until the game is completed. A true tie is close to impossible in a regular-season MLB game, since games go to extra innings under the automatic-runner rule, and only a suspended or curtailed game would produce no winner. That is the scenario the 50-50 clause exists for. For a reader trying to judge this page's central number, the honest summary is that the market is behaving as though the question were already answered, while the event itself has not happened. The gap between those two facts is the story, not the strength of either roster.

What moves the probability

  1. Starting pitchers

    Nothing moves a single-game MLB probability more than the announced starters, usually confirmed one to two days out. A clear mismatch can shift a fair price by ten to fifteen points; two comparable arms pull it back toward even. Neither club's assignment for 5 September 2026 is known this far ahead.

  2. Single-venue pricing

    All $1,312,817 of volume sits on one venue, so there is no second price to check the level against. Thin two-sided interest can leave a market parked near certainty regardless of the underlying fixture. If other venues begin quoting the game, any correction would show up as a widening spread first.

  3. Playoff race incentives

    With three wild card places per league, September head-to-head games between AL East rivals change both teams' standing at once. A club still in contention plays its best available lineup and bullpen; a club already eliminated rests players. This pushes the probability in whichever direction the standings dictate by early September.

  4. Weather and postponement

    Rain in early September can push the game to a make-up date or a doubleheader. That does not settle the market either way — it stays open until the game is completed — but it changes pitching plans, which is where the real probability shift comes from.

The case for

  • Boston wins the scheduled game outright on 5 September 2026 and MLB's official final statistics record the result, which is all the market requires.
  • A favourable starting-pitcher matchup announced in the days before the game would be the clearest concrete support for a high probability.
  • If the Yankees are out of contention by early September and rest regulars while Boston is still chasing a postseason place, the lineup gap alone would justify Boston being priced well above even.

The case against

  • Single MLB games are close to coin flips by nature; no team-quality argument supports a near-certain price on one fixture, so the market's level is unusually exposed to reversion.
  • A short-rest or bullpen-heavy start for Boston, or a strong Yankees rotation slot, could move the fair price sharply back toward even once starters are confirmed.
  • A postponement reshuffles both pitching plans and leaves the market open until the game is played, adding uncertainty rather than removing it.
  • With all volume on a single venue and no second price to test it, the current level may reflect a lack of counterparties as much as a view on the game.

What to watch

Three things between now and 5 September 2026. First, MLB's probable-pitcher listings, which firm up one to two days before the game and are the single largest driver of a fair price for one fixture. Second, the AL East and wild card standings in the first week of September, which determine whether either club is resting players or playing its strongest lineup. Third, the forecast in the days before the game: a postponement moves the fixture to a make-up date or a doubleheader and keeps the market open rather than settling it. Whether a second venue starts quoting the same game is also worth tracking, because a competing price is the fastest test of the current level.

Trade this contract

Venues (1)

Open on PolymarketYes 1.00
  • gas covered

More about this event

Venues (1)

Resolution rules

Determined by
https://www.mlb.com/
Resolution date

The market resolves to 'Boston Red Sox' if Boston wins the scheduled game against the New York Yankees, and to 'New York Yankees' if New York wins. The primary source is official MLB final statistics at mlb.com; if those are not published within 24 hours of the game, credible reporting consensus may be used. A postponed game does not settle the market — it stays open until the game is completed. If the game is cancelled with no make-up game, or ends without a winner, it settles 50-50. The only venue currently trading the question, Polymarket, settles by the same MLB source, so there is no source discrepancy to explain any price gap here.

Calculation methodology →

Local context

For readers outside the United States, this one is straightforward: it is a sports result with no channel into currencies, energy prices or trade. The reason it draws attention globally is the rivalry itself — Red Sox versus Yankees is the fixture that carries MLB to audiences in the UK, Canada, Australia and India, and September meetings are the ones with postseason consequences attached. There is a second, more practical reason to read a page like this. Single-game sports markets are the cleanest illustration of how a prediction market behaves when liquidity is concentrated on one venue: a number that looks precise can be thin underneath it. That lesson transfers directly to the macro and political markets the same audience follows, where a single-venue price is common and equally worth checking.

Common questions

What exactly settles this market, and when?
The winner of the scheduled Red Sox–Yankees MLB game on 5 September 2026, taken from official MLB final statistics published at mlb.com. Settlement follows completion of the game. If official statistics are not available within 24 hours, credible reporting consensus may be used instead.
What does the price actually mean?
It is the market's current estimate of the chance the outcome happens, on a scale where $1 is paid if it does and nothing if it does not. A price of 0.30 would imply roughly a three-in-ten chance. A price close to 1.00 means the market is treating the outcome as near certain — which, for a single baseball game, is worth examining rather than taking at face value.
What happens if the game is rained out?
The market stays open until the game is completed, which in MLB usually means a make-up date or a doubleheader later in the season. Only if the game is cancelled with no make-up at all does the market settle 50-50 between the two sides.
Can an MLB game end in a tie?
Essentially no. Regular-season games go to extra innings under the automatic-runner rule and are played to a decision. A tie would require a game to be suspended or curtailed without being completed, which is the narrow case the 50-50 clause covers.
Why is a single baseball game priced so high?
Team quality alone does not explain it. Even large mismatches in MLB rarely price beyond about 70%, so a near-certain level more often reflects thin two-sided interest on a single venue than a genuine view on the fixture. With all volume in one order book and no second venue quoting the game, there is no competing price to test the level against.
Can a position be closed before the game?
Usually yes. Contracts can normally be sold at the prevailing price at any point before settlement, so a position does not have to be held until the game is played.

Related events

100%/ 1%
Yes / No
Open on Polymarket