Pittsburgh Pirates vs Miami Marlins Prediction Market Odds, August 13, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
â–¶Pirates | -1.5 30%30% | O 1 47%49% | 41%41% | 41% Kalshi |
â–¶Marlins | +1.5 70%70% | U 1 53%51% | 30%30% | 30% Kalshi |
Pittsburgh is the 53.5c road favorite for the series finale at loanDepot park, quoted at 54c on Kalshi and 53c on Polymarket against Miami at 47.5c, and that is the second lead change in three days. Miami won the first two games of the set 2-0 and 8-2, but the market is trading the starters rather than the series: Braxton Ashcraft (11-5, 4.08 ERA) goes for Pittsburgh (58-64) against Tyler Phillips (3-5, 3.47 ERA) for Miami (62-59). The board carries roughly $9.6K in cumulative volume across both platforms and resolves when the game goes final on August 13, 2026.
Pittsburgh at Miami is the rare daily board where the price has changed sides twice inside a single series. Pittsburgh opened the set as the 52c favorite on August 11 and lost 2-0. Miami took the number at 52c on August 12 and won 8-2. For the August 13 finale the board is back on Pittsburgh at 54c on Kalshi and 53c on Polymarket, a 53.5c blended read against Miami at 47.5c. Two lead changes in three days between a 58-64 road club and a 62-59 home club says the starting pitcher, not the standings, is doing the pricing work on this game.
Pirates vs Marlins Market Context
The records argue for Miami and the price does not. Miami is 62-59 overall and 38-24 at loanDepot park, a .613 home clip that is the third-best mark on the Marlins' season ledger. Pittsburgh is 58-64 overall and 28-34 away from PNC Park. A home team with that split priced at 47.5c is the market saying the day's specific matchup outweighs the venue edge, and the two games already played in this series did nothing to move it back. Miami outscored Pittsburgh 10-2 across August 11 and August 12 and still lost the number.
Liquidity on the game is modest and cross-platform agreement is tight. The full board carries roughly $9.6K in cumulative volume with both Kalshi and Polymarket quoting the moneyline, and the two books sit 1c apart on each side (54c and 53c on Pittsburgh, 47c and 48c on Miami). At that width there is no meaningful price advantage on either venue for the moneyline, which is what a well-arbitraged daily baseball market normally looks like. The wider disagreement sits on the derivative lines: first-five-innings over 2.5 runs prints 76c on Kalshi against 73c on Polymarket, a 3c spread and the widest gap anywhere on this board.
Intraday movement backs the flip. Across the roughly two-hour snapshot window that closed at 10:02 PM ET on August 12, the Kalshi Pittsburgh moneyline ticked from 52c to 54c while Polymarket held flat at 53c, and the Kalshi Miami side eased from 48c to 47c over the same stretch. That is a slow drift in one direction rather than a single repricing event, and it left Kalshi carrying the higher Pittsburgh number into game day.
Pirates vs Marlins Pitching Matchup
Braxton Ashcraft (11-5, 4.08 ERA, 145 strikeouts) starts for Pittsburgh against Tyler Phillips (3-5, 3.47 ERA, 70 strikeouts) for Miami. Phillips owns the better rate stat by 0.61 runs of ERA, but Ashcraft carries the workload profile: 145 strikeouts to Phillips' 70 implies roughly double the innings, and 11 wins against 5 losses on a team 6 games under .500 is the kind of gap the market rewards. That is the cleanest explanation for a road favorite here, and it is consistent with the August 12 board, where Miami held the number behind a different starter.
The offensive tiebreakers are close. Pittsburgh's board is led by Brandon Lowe at 25 home runs and 74 RBIs with Nick Gonzales hitting .307. Miami counters with Otto Lopez at .314 and 53 RBIs plus Heriberto Hernandez at 17 home runs. Team-total pricing splits the difference by a hair in Pittsburgh's favor: Kalshi has Pittsburgh over 3.5 runs at 58c against Miami over 3.5 runs at 50c, an 8c edge to the road offense that matches the moneyline direction.
Totals lean quiet. The full-game over 8.5 trades at 45c on Kalshi and 46c on Polymarket, so the blended read is a modest under lean at 45.5c, and the Kalshi run ladder confirms it with over 7.5 runs at 54c and over 9.5 runs at 35c. The first-five market is priced the same way, with over 4.5 runs in the first five innings at 47c on Kalshi and the Polymarket first-five 4.5 line at 48c. A run in the first inning sits at 48c on both books, dead even. If Ashcraft and Phillips both work deep, the under 8.5 and the first-five under are the lines carrying the read.
Run lines are where the market prices the shape of a Pittsburgh win. Pittsburgh -1.5 trades at 41c and Miami -1.5 at 30c, which implies the market sees a Pittsburgh win as more likely to arrive by 2 or more runs than a Miami win. Shortened to five innings the ladder compresses, with Pittsburgh -1.5 at 33c and Miami -1.5 at 25c. For context on how this same board priced before the series turned, the August 12 Pirates vs Marlins page carried Miami as the favorite.
When the Pirates vs Marlins Market Resolves
The moneyline resolves to the team that wins the game at loanDepot park on August 13, 2026, first pitch scheduled for 1:10 PM ET. Each team contract pays $1 per share if that team wins and $0 otherwise, with the winner determined by the official final score including any extra innings. Run-line and total contracts settle on that same official final score, so a game that goes past the ninth counts every run scored. If the game is postponed, suspended, or shortened before it becomes an official game, each platform applies its own rain and postponement rules, which generally means the contract carries to the completed game or voids at the platform's discretion.
Key Pirates vs Marlins Catalysts
- Starter workload gap: Ashcraft's 145 strikeouts against Phillips' 70 is the single biggest input behind Pittsburgh trading as a road favorite.
- Home split versus price: Miami is 38-24 at loanDepot park and still sits at 47.5c, so any late lineup news that supports the home side has room to move the number.
- Two lead changes in three days: Pittsburgh 52c on August 11, Miami 52c on August 12, Pittsburgh 54c on August 13 means this board reprices quickly on pitcher confirmation.
- First-five cross-platform gap: over 2.5 runs in the first five innings prints 76c on Kalshi against 73c on Polymarket, the widest disagreement on the board.
- Under lean on the total: over 8.5 at 45.5c blended and over 7.5 at 54c on Kalshi put the market slightly under the posted number.
- Team-total tilt: Pittsburgh over 3.5 runs at 58c against Miami over 3.5 runs at 50c is the offense read that matches the moneyline direction.
Related Pirates vs Marlins Markets
Both clubs carry season-long boards worth tracking alongside the daily game. The Pittsburgh Pirates hub collects the franchise's win-total and postseason contracts, and the Miami Marlins hub does the same for a team playing above .500 in mid-August. For the rest of the Thursday slate, the Mariners vs Yankees finale and the Brewers vs Dodgers board are the two highest-profile pitching matchups on the card, and the full league board lives at the MLB prediction markets hub.
Resolution Criteria
The moneyline resolves to the team that wins the game between the Pittsburgh Pirates and the Miami Marlins at loanDepot park on August 13, 2026, with first pitch scheduled for 1:10 PM ET. Each team contract pays $1 per share if that team wins and $0 otherwise, determined by the official final score including extra innings. Run-line contracts (Pittsburgh -1.5 and Miami -1.5) and total contracts (over and under 8.5 runs, plus the alternate ladder and the first-five-innings markets) settle on that same official final score, and first-five markets settle on the score after five completed innings. If the game is postponed, suspended, or called before it becomes an official game, Kalshi and Polymarket each apply their own postponement rules, which generally carry the contract to the completed game or void it.
Key Factors
- Braxton Ashcraft (11-5, 4.08 ERA, 145 K) versus Tyler Phillips (3-5, 3.47 ERA, 70 K) is the pricing input behind a road favorite
- Miami is 38-24 at loanDepot park but trades at 47.5c, so home-side news has room to move the number
- Two lead changes in three days: Pittsburgh 52c on August 11, Miami 52c on August 12, Pittsburgh 54c on August 13
- First-five over 2.5 runs at 76c Kalshi versus 73c Polymarket is the widest cross-platform gap on the board
- Total leans under: over 8.5 at 45.5c blended, over 7.5 at 54c on Kalshi
- Team totals tilt Pittsburgh: over 3.5 runs at 58c versus Miami over 3.5 runs at 50c
What are the current Pirates vs Marlins odds?
As of August 13, 2026, Pittsburgh is the 53.5c blended favorite, quoted at 54c on Kalshi and 53c on Polymarket. Miami is at 47.5c, 47c on Kalshi and 48c on Polymarket. The two books sit 1c apart on each side.
Who is favored in Pirates vs Marlins on August 13, 2026?
Pittsburgh is favored at 53.5c, an implied win probability of roughly 54%, despite a 58-64 record and a 28-34 road mark against Miami at 62-59 and 38-24 at home. The starting pitching gap is the reason.
Who are the probable starting pitchers for Pirates vs Marlins?
Braxton Ashcraft (11-5, 4.08 ERA, 145 strikeouts) starts for Pittsburgh and Tyler Phillips (3-5, 3.47 ERA, 70 strikeouts) starts for Miami. First pitch is 1:10 PM ET at loanDepot park.
Where can I trade the Pirates vs Marlins market?
Both Kalshi and Polymarket list this game, with a moneyline, run lines at -1.5 and -2.5, full-game and first-five totals, team totals, and a run-in-the-first-inning contract at 48c on both books.
What is the total in Pirates vs Marlins?
The posted total is 8.5 runs, with the over at 45c on Kalshi and 46c on Polymarket for a 45.5c blended read. The Kalshi ladder has over 7.5 runs at 54c and over 9.5 runs at 35c.
What should I watch before the Pirates vs Marlins market resolves?
Watch for confirmation of both starters, since this board moved sides twice in three days on pitcher news, and watch the first-five lines, where Kalshi and Polymarket disagree by 3c on over 2.5 runs.