Red Sox vs Marlins Prediction Market Odds, August 26, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
Sox | +1 — | O 2.5 14% | 0%0% | — |
Marlins | -1 — | U 2.5 — | 100%100% | 100% Kalshi |
| Spread | Total | Moneyline | Best ML | |
|---|---|---|---|---|
Boston Red Sox | +1 — | O 2.5 | 0%0% | — |
Miami Marlins | -1 — | U 2.5 — | 100%100% | 100% Kalshi |
Boston is the 60c favorite for the series finale at loanDepot park, priced at 60c on Kalshi and 60c on Polymarket, with Miami at 40.5c on average. The Red Sox are 73-59 and have won five straight, including 4-2 and 7-3 wins over Miami in the first two games of this series, while the 67-66 Marlins are 41-27 at home and 26-39 on the road. Sonny Gray (16-3, 2.79 ERA) starts against Ryan Gusto (0-3, 4.37 ERA), and the board has traded $62K in lifetime volume across both platforms.
Boston carries a five-game winning streak into the series finale at loanDepot park on August 26, 2026, and the market prices the Red Sox at 60c on both Kalshi and Polymarket. That is a tighter number than a 73-59 club against a 67-66 club normally draws, and the splits explain it: Miami is 41-27 at home and 26-39 on the road, while Boston's 39-27 road mark is the stronger half of its own season. The board has taken $62K in lifetime volume across the two platforms, with the moneyline holding roughly $55K of it.
Red Sox vs Marlins Market Context
Boston is 73-59 and third in the AL East, 5.5 games behind Tampa Bay (78-53) and 1.5 behind the New York Yankees (74-57), and the Red Sox are 8-2 in their last 10. They have already taken this series, winning 4-2 on August 24 and 7-3 the following night, so the finale is a sweep attempt. Miami is 67-66 and third in the NL East, 10.5 games behind Atlanta (77-55) and 4.5 games out of the final National League wild card spot behind San Diego (71-61), on a two-game losing streak after going 5-5 over its last 10.
The moneyline is the cleanest read on the board. Boston sits at 60c on Kalshi and 60c on Polymarket, and Miami at 40c on Kalshi and 41c on Polymarket, an average of 40.5c. The two sides sum to 100.5c, which is under a cent of built-in margin and one of the tighter two-sided books on the MLB slate. The cross-platform story here is agreement rather than a gap: neither book is offering a materially different number on either side, and the only real difference between them is depth, since Kalshi carries about $50K of the moneyline volume against roughly $5K on Polymarket.
The derivative markets fill in the shape of the expected game. Boston at -1.5 on the run line trades at 46c on both platforms, Miami at -1.5 at 25c, and the primary total of 7.5 runs prices the over at 51c with $909 of lifetime volume. The 8.5 total sits at 43c and the 6.5 at 63c, so the ladder is centered almost exactly on 7.5. Taken together, the board expects a one-run to two-run Boston edge in a game that finishes right around seven or eight combined runs.
On line movement, the board's snapshot series only reaches back about two hours on the evening of August 25, so this is a short window rather than a full session. Inside it, Boston's Kalshi leg opened at 61c and has settled at 60c, the Polymarket leg held 60c across every capture, and Miami's Kalshi leg never moved off 40c. That is a one-cent drift on one platform, not a trend, and there is no earlier history on this board to compare it against.
Red Sox vs Marlins Pitching Matchup
Sonny Gray is the reason Boston is favored on the road. He is 16-3 with a 2.79 ERA and a 1.16 WHIP over 24 starts, with 123 strikeouts and 36 walks in 138.2 innings for a 3.4 strikeout-to-walk ratio. His strikeout ladder reflects that workload: 4-plus strikeouts trades at 83c, 5-plus at 70c, 6-plus at 51c, and 7-plus at 34c. Gray averages 8.0 strikeouts per nine innings, so the 6-plus line sitting almost exactly at a coin flip is consistent with his rate rather than a market lean.
Ryan Gusto goes for Miami at 0-3 with a 4.37 ERA and a 1.34 WHIP across 17 appearances and 12 starts, covering 57.2 innings with 51 strikeouts and 15 walks. The number that matters for this game is 65.3 pitches per start, the lowest workload of any regular starter in this series, and one quality start on the season. Gusto's prop ladder is priced accordingly, with 4-plus strikeouts at 55c and 5-plus at 34c, well below Gray's equivalents. A short Gusto outing puts the Miami bullpen into the game early for a third straight night, and that is the single most direct path to the over on 7.5.
The lineups are asymmetric in power. Willson Contreras leads Boston with 26 home runs and 78 RBI and Ceddanne Rafaela is hitting .288. Miami counters with Otto Lopez at .306 and 59 RBI and Heriberto Hernandez at 20 home runs, a contact-first group that has been better at home all year. The first-five-innings markets split the difference: Kalshi has Boston at -1.5 through five at 35c and over 3.5 first-five runs at 57c, while Polymarket runs a separate leading-after-five market with Boston at 49c, Miami at 35c, and a tie at 17c. The first-inning run market at 45c is the second-most-traded line on the board with $2.6K of lifetime volume, which is unusual for a derivative and worth watching as first pitch approaches.
When the Red Sox vs Marlins Market Resolves
First pitch is 6:40 PM ET on August 26, 2026 at loanDepot park in Miami, a start time confirmed independently by the Kalshi event ticker and the ESPN scoreboard entry for the date. The moneyline resolves to the team that wins the game, including extra innings. The run line and the run totals settle on the final combined score, and the first-five-innings markets settle on the score after five completed innings. Both Kalshi and Polymarket settle once the game is official.
Key Red Sox vs Marlins Catalysts
- Gray's form: Boston's starter is 16-3 with a 2.79 ERA and a 1.16 WHIP over 24 starts, and his 6-plus strikeout prop at 51c is the tightest number on the prop board.
- Gusto's pitch count: Miami's starter averages 65.3 pitches per start with one quality start, so the Marlins bullpen is the likely decider in innings five through seven.
- The home and road split: Miami is 41-27 at loanDepot park and 26-39 away from it, while Boston is 39-27 on the road, which is why the favorite is only 60c.
- Series momentum: Boston has won five straight and took the first two games of this series 4-2 and 7-3, with Miami dropping two in a row.
- Cross-platform agreement: Kalshi and Polymarket both price Boston at 60c and sit a cent apart on Miami, so the useful difference between the venues is liquidity, not price.
- The total at 7.5: the over trades at 51c with the 8.5 at 43c and the 6.5 at 63c, a ladder centered on the primary number with no lean built in.
Related Red Sox vs Marlins Markets
The August 25 meeting of these two clubs is the closest comparison, with Boston winning 7-3 as the road favorite. Boston's finish sits inside the AL East division market, where the Red Sox trail Tampa Bay by 5.5 games, and Miami's sits inside the NL East division market, where the Marlins are 10.5 back of Atlanta. Both clubs also price on the 2026 World Series board. Full schedules and every open contract for each side live on the Boston Red Sox hub and the Miami Marlins hub.
Resolution Criteria
The market resolves on the outcome of the Boston Red Sox at Miami Marlins game scheduled for 6:40 PM ET on August 26, 2026 at loanDepot park in Miami. The moneyline resolves to the team that wins the game, extra innings included, and each winning contract pays $1 per share while the losing side pays $0. The run line contracts settle on whether the listed team wins by more than the stated margin, and the run totals settle on the final combined score of both teams. The first-five-innings markets settle on the score after five completed innings. Both Kalshi and Polymarket settle once the game is official. If the game is postponed, suspended, or shortened, each platform applies its own rules, which generally void or roll contracts that never reach an official result rather than settling them on a partial score.
Key Factors
- Sonny Gray starts for Boston at 16-3 with a 2.79 ERA and 1.16 WHIP over 24 starts
- Ryan Gusto averages 65.3 pitches per start with one quality start, putting the Miami bullpen in play early
- Miami is 41-27 at loanDepot park and 26-39 on the road against Boston's 39-27 road record
- Boston has won five straight and leads the series 2-0 after 4-2 and 7-3 wins
- Kalshi and Polymarket both price Boston at 60c, so the difference between venues is liquidity not price
- The first-inning run market at 45c is the second-most-traded line on the board at $2.6K lifetime volume
What are the current Red Sox vs Marlins odds?
As of August 26, 2026, Boston is the favorite at 60c on Kalshi and 60c on Polymarket, and Miami trades at 40c on Kalshi and 41c on Polymarket for a 40.5c average. The two sides sum to 100.5c, one of the tighter two-sided books on the MLB slate.
When does the Red Sox vs Marlins market resolve?
First pitch is 6:40 PM ET on August 26, 2026 at loanDepot park, and the market settles once the game is official, typically within a few hours of the final out.
Where can I trade the Red Sox vs Marlins market?
Both Kalshi and Polymarket list this game, and the board has taken $62K in lifetime volume. Kalshi carries roughly $50K of the moneyline volume against about $5K on Polymarket, so it is the deeper of the two venues on this game.
Who is favored in Red Sox vs Marlins and by how much?
Boston is favored at 60c, an implied probability of about 60%, against Miami at 40.5c. The run line has Boston at -1.5 at 46c on both platforms and the total of 7.5 runs prices the over at 51c.
What should I watch before Red Sox vs Marlins resolves?
Watch Ryan Gusto's pitch count, since he averages 65.3 pitches per start and a short outing hands the game to a Miami bullpen working a third straight night. Sonny Gray's 6-plus strikeout prop at 51c is the other line most likely to move before first pitch.