Giants vs Mets Prediction Market Odds, September 5, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
Giants | +1.5 — | O 9.5 — | 100%100% | 100% Kalshi |
Mets | -1.5 — | U 9.5 — | 0%0% | — |
| Spread | Total | Moneyline | Best ML | |
|---|---|---|---|---|
San Francisco Giants | +1.5 — | O 9.5 — | 100%100% | 100% Kalshi |
New York Mets | -1.5 — | U 9.5 — | 0%0% | — |
New York is the 64c favorite over San Francisco on a board that has Kalshi and Polymarket priced exactly level, 64c and 37c on both books. The Giants bring a 58-84 record and a 25-48 road mark into Citi Field against a 64-77 Mets team that took the opener 10-6. Zac Thornton (2.93 ERA, 11 starts) faces Anthony Molina, who has thrown 14.1 major league innings. First pitch is 4:10 PM ET on September 5, 2026.
San Francisco arrives at Citi Field 58-84 overall and 25-48 away from Oracle Park, and the board has priced that road split without much argument: New York is the 64c favorite and the Giants sit at 37c. Neither club is playing for anything. The Mets are 64-77, fifth in the National League East, 20 games out of the division and 10 back of a wild card. The Giants are 26 out in the West and 16.5 back of a wild card. New York took the series opener 10-6 on Friday night, so this is the middle game of a three-game set with roughly $11.4K of cumulative volume across Kalshi and Polymarket.
Giants vs Mets Market Context
The moneyline is the cleanest read on the board. New York trades at 64c on both Kalshi and Polymarket, San Francisco at 37c on both, which is a rare exact agreement between the two books and leaves no cross-platform gap to work on the primary line. Stripping the 101c overround, the market gives the Mets about a 63% chance of winning. That is a heavier number than the two records suggest on their own, because the underlying run data is closer than the standings: San Francisco has actually scored more runs this season (592) than New York (587). The separation is on the pitching side, where the Giants have allowed 669 runs to the Mets' 633.
The split records carry the price. New York is 33-39 at Citi Field, which is a modest home edge, but San Francisco's 25-48 road mark is a .342 winning percentage and the single worst number either team brings into the series. Recent form is flatter than the season lines: the Mets are 5-5 over their last 10 with a two-game winning streak, the Giants 4-6 with a two-game losing streak.
The board carries about two hours of snapshot history, captured Friday evening Eastern time, so the movement window is short and any claim beyond it would be invented. Inside that window the Mets firmed from 63c to 64c on Polymarket while Kalshi held 64c apart from a single 63c print, and the Giants eased from 38c to 37c on Polymarket. That is a one-cent drift toward the home team, not a market reprice.
The alt markets sit where the moneyline implies. The run line has New York at -1.5 for 44c, a full 20c below the straight moneyline, which is the market saying a Mets win is likely but a Mets blowout is closer to a coin flip. San Francisco at -1.5 is 27c. The full-game total is set at 8.5, with the Over 8.5 rung at 45.5c (45c Kalshi, 46c Polymarket) and Over 9.5 at 34.5c (34c Kalshi, 35c Polymarket). Over 9.5 is the most-traded alt rung on the whole board at roughly $4.0K, more volume than either run-line side has drawn.
The Giants vs Mets Pitching Matchup
New York hands the ball to Zac Thornton, who has been the most reliable arm on this board by a distance: 3-4 with a 2.93 ERA over 11 starts and 61.1 innings, 45 strikeouts against 14 walks, a 1.16 WHIP and seven home runs allowed. Opponents are hitting .251 against him. The 3-4 record is a run-support artifact on a 64-77 team, not a quality signal, and the 2.93 ERA is what the market is paying for at 64c.
San Francisco counters with Anthony Molina, and the volume of information here is thin enough to matter to the total. Molina is 2-0 with a 3.77 ERA across 14.1 major league innings and five appearances, only one of them a start this season. Split by club, he has a 2.89 ERA over 9.1 innings since joining the Giants and carried a 5.40 ERA over five innings with Atlanta before that. He has walked two batters all season and holds a 1.05 WHIP, so the command has been real, but 14.1 innings is a sample the market cannot lean on and a starter with one start on the season rarely goes deep.
That is the practical read on the total. If Molina is capped at four or five innings, San Francisco's bullpen absorbs the middle of a game against a lineup that just put up 10 runs, and the Over 9.5 rung at 34.5c is the leverage point. The first-inning market prices a run in the opening frame at 48.5c (48c Kalshi, 49c Polymarket), and the first-five-innings total sits at 4.5 runs priced 49.5c, both consistent with a board expecting a normal-scoring start and variance later.
The 4:10 PM ET first pitch is a Saturday afternoon window with SNY and NBC Sports Bay Area carrying it. The Mets and Giants close the series on Sunday, and the September 6 finale is already trading with New York at 57c, a full seven cents softer than this game, which is the clearest signal available that the market rates Thornton specifically rather than the matchup generally.
When the Giants vs Mets Market Resolves
The moneyline resolves to the team that wins the game at Citi Field on Saturday, September 5, 2026, first pitch 4:10 PM ET. Kalshi and Polymarket both settle on the official final score once the game goes final, including extra innings. The run line settles on margin of victory, the full-game total on combined runs scored by both clubs, and the first-five-innings markets on the score after five complete innings. A suspended or postponed game is voided or rescheduled per each platform's own game rules rather than settling on a partial score.
Key Giants vs Mets Catalysts
Molina's workload: 14.1 major league innings and one start on the season means the Giants bullpen is likely in the game by the fifth, which is the main input to the total.
Thornton at home: a 2.93 ERA over 61.1 innings with a 1.16 WHIP is the reason New York is 64c rather than a coin flip against a 58-84 opponent.
The road split: San Francisco is 25-48 away from Oracle Park against a New York team that is 33-39 at Citi Field.
Run line value: Mets -1.5 at 44c prices a two-run home win 20c below the straight moneyline.
Book agreement: Kalshi and Polymarket are exactly level at 64c and 37c on the moneyline, so the value question here is the number itself, not the venue.
Total leverage: Over 9.5 at 34.5c has drawn roughly $4.0K, more than any spread rung on the board.
Related Giants vs Mets Markets
Both clubs have longer-dated exposure worth tracking alongside this game. The San Francisco Giants hub and the New York Mets hub carry every active market on each team, including season and futures lines. For the wider slate, the MLB market hub lists every game board trading on Kalshi and Polymarket, and the World Series winner market is where October's field is priced across both books.
Resolution Criteria
The moneyline resolves to the team that wins the game at Citi Field on Saturday, September 5, 2026, scheduled for 4:10 PM ET. Kalshi and Polymarket both settle against the official final score once the game is complete, including any extra innings, and each winning team contract pays $1 per share while the losing side settles at $0. The run line settles on final margin of victory, the full-game total on combined runs scored by both teams, and the first-five-innings markets on the score after five complete innings. If the game is postponed, suspended, or shortened, each platform applies its own official game rules, which generally void or reschedule the contract rather than settling it on a partial score.
Key Factors
- Anthony Molina's workload ceiling for San Francisco: 14.1 major league innings and one start on the season, so the bullpen likely enters by the fifth
- Zac Thornton's form for New York: 2.93 ERA over 11 starts and 61.1 innings, 45 strikeouts against 14 walks, 1.16 WHIP
- San Francisco is 25-48 on the road against a New York team that is 33-39 at Citi Field
- The run line has the Mets at -1.5 for 44c, 20c below the straight moneyline
- Kalshi and Polymarket are exactly level on the moneyline at 64c and 37c, so there is no cross-platform gap on the primary line
- The full-game total is set at 8.5, and the Over 9.5 rung has drawn roughly $4.0K, more than any spread rung on the board
What are the current Giants vs Mets odds?
As of the evening of September 4, 2026, the New York Mets trade at 64c on both Kalshi and Polymarket and the San Francisco Giants at 37c on both. The two books are exactly level on the moneyline, which is unusual on a game board this size.
Who is favored in Giants vs Mets on September 5, 2026?
New York is favored. Stripping the 101c overround off the two-sided market, 64c implies roughly a 63% chance the Mets win at Citi Field. San Francisco is the 37c underdog.
What is the run line and total for Giants vs Mets?
The run line has the Mets at -1.5 for 44c and the Giants at -1.5 for 27c. The full-game total is set at 8.5, with Over 8.5 at 45.5c and Over 9.5 at 34.5c. Over 9.5 is the heaviest-traded alt rung on the board at roughly $4.0K.
Where can I trade the Giants vs Mets game?
The game trades on both Kalshi and Polymarket, with about $11.4K of cumulative cross-platform volume across the moneyline, run line, totals, and inning markets. The live board above shows current prices on each platform.
When does the Giants vs Mets market resolve?
It resolves when the game goes final at Citi Field on Saturday, September 5, 2026, first pitch 4:10 PM ET. The moneyline settles on the winner, the run line on margin, and the totals on combined runs including extra innings.
What should I watch before Giants vs Mets resolves?
Anthony Molina has thrown 14.1 major league innings with only one start on the season, so how deep he goes for San Francisco is the main variable on the total. Zac Thornton carrying his 2.93 ERA through six innings for New York is the case for the Mets at -1.5.