Marlins vs Nationals Prediction Market Odds, August 28, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
▶Marlins | — | O 1 54%46% | 57%53% | 57% Kalshi |
▶Nationals | — | U 1 46%54% | 46%47% | 47% Polymarket |
| Spread | Total | Moneyline | Best ML | |
|---|---|---|---|---|
▶Miami Marlins | — | O 1 | 57% Kalshi | |
▶Washington Nationals | — | U 1 | 47% Polymarket |
No player props available for this game.
No spread lines available.
Miami is the 55c road favorite over Washington on August 27, 2026 (57c Kalshi, 53c Polymarket), driven almost entirely by the starting pitching gap: Eury Perez at a 3.17 ERA against Jackson Kent at 8.03. The Marlins are 68-66 and the Nationals 62-73, and Washington has lost eight of its last ten including a three-game sweep in Miami last week. The live board above carries current prices for the moneyline and the first-inning run market.
Miami is the road favorite in Washington on Friday, which is not how the season splits read. The Marlins are 26-39 away from loanDepot park and 42-27 at home, yet the board opens them at a 55c average (57c on Kalshi, 53c on Polymarket as of August 27, 2026) for the opener of a four-game series at Nationals Park. The pitching matchup is why. Eury Perez (7-9, 3.17 ERA) draws Jackson Kent (0-2, 8.03 ERA), and that is the widest probable-starter ERA gap on the fifteen-game slate.
Marlins vs Nationals Market Context
Miami enters at 68-66, eighth in the National League and four games behind San Diego (72-62) for the third wild card. Washington is 62-73, twenty-one games back in the league. The Marlins playoff market prices Miami at 5c on Kalshi and the Nationals playoff market prices Washington at 1c, so this is a spoiler series for one side and a long-odds push for the other.
Form points the same direction as the price. Washington is 2-8 over its last ten, and three of those losses came in Miami on August 21, 22 and 23 by scores of 3-2, 4-2 and 6-2. The Nationals then dropped two of three at home to Colorado, including a 13-1 loss on August 26. Miami is 5-5 over the same stretch, with the Boston series split and a 4-0 shutout win on August 26 to close it.
The cross-platform read is the interesting part of this board. Kalshi has held Miami at 57c to 58c across all sixteen captures our snapshot series carries since August 26, while Polymarket drifted from 56c down to 53c over the same window. The gap between the two books opened at roughly 1c and now sits at 4c. Kalshi's two legs sum to 103c against Polymarket's 100c, so Kalshi is carrying the vig on both sides and Polymarket is the tighter book on the Miami side at 53c. Washington reads 46c on Kalshi and 47c on Polymarket, a 1c disagreement that says the books only diverge on the favorite.
The head-to-head record is the strongest argument for the road price. Miami is 8-1 against Washington this season across nine meetings, including a 3-0 sweep at Nationals Park on June 1, 2, and 3 by scores of 7-3, 7-3 and 4-1, and the 3-0 sweep in Miami last week. The Marlins have won seven straight in the series. A 55c favorite price implies a 55% win probability, which is a long way below what an 8-1 season series and a five-run starter ERA gap would suggest on their own, so the books are discounting both heavily against Miami's road profile.
Depth is the caveat on every number above. The moneyline carries $387 in lifetime volume across both platforms and the full board carries $424. That is a thin book by any standard, so a single sized fill moves the quote and the 4c cross-platform gap reflects two shallow order books more than it reflects two competing views of Eury Perez.
The one prop attached to this game is the run-in-the-first-inning market, quoted at 54c on Kalshi. Polymarket lists the same contract with zero volume behind it, and its snapshot series drifted from 50c to 47c over the last day, so the Kalshi quote is the only one with a book behind it. Perez has been the more reliable first-inning arm of the two starters this season by ERA, and Kent's 8.03 mark is built substantially on early traffic.
When the Marlins vs Nationals Market Resolves
The market resolves on the final score of the game scheduled for Friday, August 28, 2026 at 6:45 PM ET at Nationals Park, confirmed by both the Kalshi ticker time segment and the ESPN scoreboard entry for that date. Each moneyline contract pays $1 per share if that team wins and $0 if it loses. The first-inning contract settles yes if either team scores in the top or bottom of the first. Kalshi and Polymarket both settle once the game is official and the result is final.
Key Marlins vs Nationals Catalysts
Starting pitching gap: Eury Perez at a 3.17 ERA against Jackson Kent at 8.03 is the single largest input in the 55c price.
Miami's road split: the Marlins are 26-39 away from home, which argues the road favorite price is generous to Miami.
Washington's slide: the Nationals are 2-8 in their last ten and were swept in Miami on August 21 through August 23.
Cross-platform gap: Kalshi holds Miami at 57c while Polymarket reads 53c, a spread that widened from about 1c on August 26.
Book depth: $387 in lifetime moneyline volume means one sized order re-prices this board, so treat the quote as provisional.
Series length: this is the opener of four straight at Nationals Park through August 31, so bullpen usage on Friday shapes the rest of the set.
Related Marlins vs Nationals Markets
The season-long context for this game trades on the Marlins win total market and the NL East winner market, where neither of these clubs is a live price. Team-level boards for both sides sit at the Miami Marlins hub and the Washington Nationals hub, and the rest of Friday's fifteen-game card is priced on today's MLB board.
Resolution Criteria
Resolves to the team that wins the game played Friday, August 28, 2026 at 6:45 PM ET at Nationals Park, the opener of a four-game series running through August 31. Each moneyline contract pays $1 per share if that team wins the game and $0 otherwise, settled on the official final score. The first-inning contract resolves yes if either team scores a run in the first inning. If the game is suspended and completed on a later date, both platforms settle on the completed official result; if the game is postponed and rescheduled outside the contract window or canceled outright, contracts void and refund per each platform-specific rulebook.
Key Factors
- Eury Perez (7-9, 3.17 ERA) against Jackson Kent (0-2, 8.03 ERA), the widest probable-starter ERA gap on the slate
- Miami is 26-39 on the road and 42-27 at home, which cuts against the road-favorite price
- Washington is 2-8 in its last ten and was swept in Miami on August 21 through August 23
- Kalshi holds Miami at 57c while Polymarket reads 53c, a gap that widened from about 1c on August 26
- Only $387 in lifetime moneyline volume across both books, so a single sized fill re-prices the board
- First-inning run market at 54c on Kalshi with no Polymarket volume behind the same contract
What are the current Marlins vs Nationals odds?
As of August 27, 2026, Miami is the 55c favorite (57c on Kalshi, 53c on Polymarket) and Washington reads 46.5c (46c Kalshi, 47c Polymarket). The live board on this page carries the current quote.
When does the Marlins vs Nationals market resolve?
It settles on the final score of the game played Friday, August 28, 2026, first pitch 6:45 PM ET at Nationals Park. Both Kalshi and Polymarket settle once the game is official.
Where can I trade the Marlins vs Nationals market?
Both Kalshi and Polymarket list the moneyline and the first-inning run contract for this game. Combined lifetime volume across the board is roughly $424, which makes it a thin book.
Who is favored in Marlins vs Nationals and by how much?
Miami is favored at a 55c average, an implied 55% win probability, despite a 26-39 road record. The favorite price is anchored to Eury Perez at a 3.17 ERA opposite Jackson Kent at 8.03.
What should I watch before the Marlins vs Nationals market resolves?
Watch whether Polymarket keeps drifting away from Kalshi on Miami, since the gap widened from about 1c to 4c between August 26 and August 27, and watch for any late change to either probable starter.