Mets vs Rays Prediction Market Odds, August 31, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
â–¶Mets | +1.5 57%57% | O 7.5 54%54% | 39%38% | 39% Kalshi |
â–¶Rays | -1.5 43%43% | U 7.5 46%46% | 62%63% | 63% Polymarket |
| Spread | Total | Moneyline | Best ML | |
|---|---|---|---|---|
â–¶New York Mets | +1.5 | O 7.5 | 39% Kalshi | |
â–¶Tampa Bay Rays | -1.5 | U 7.5 | 63% Polymarket |
Tampa Bay is the 61c favorite over New York on a board carrying $40.3K in lifetime volume, and Kalshi and Polymarket have the number in exactly the same place. The Rays (82-54) lead the AL East by 4.5 games and have won four straight. The Mets (61-76) are 21 games out in the NL East and have lost four of their last five. First pitch is 6:40 PM ET on August 31, 2026 at Tropicana Field in St. Petersburg, the opener of a three-game interleague series. Prices cited below were captured the evening of August 30, 2026; the live board above carries the current number.
Tampa Bay opens a three-game interleague set as the 61c side against a New York club that has lost 76 games and is sending a reliever to the mound. The Rays are 46-23 at home, the Mets are 29-37 on the road, and the starting pitching gap is the widest single input on the board. The market still prices the Rays about 10 points below where ESPN's matchup model puts them, which is where the read on this game lives.
Mets vs Rays Pitching Matchup and Form
Ian Seymour starts for Tampa Bay at 9-5 with a 4.21 ERA and a 1.15 WHIP across 107.0 innings, 128 strikeouts, and 10.8 strikeouts per nine. He has made 41 appearances with 11 starts and four quality starts, so the Rays treat him as a bulk-innings arm rather than a workhorse, but he has held opponents to a 1.15 WHIP and has walked only 32 batters all season.
Robert Stock answers for New York at 0-3 with a 7.40 ERA and a 1.94 WHIP over 20.2 innings. ESPN lists him as a reliever, and the shape of his line confirms it: five starts, 20.2 innings, an average of just over four innings per outing, and 13 walks against 21 strikeouts. That is a bullpen game with a name attached to the first inning, and the Mets are running it with Devin Williams and Cionel Perez both on the 15-day injured list.
Form agrees with the records. Tampa Bay swept San Diego at home over the weekend, 9-4, 7-6, and 5-4 in 11 innings, and is 4-1 in its last five. New York lost 6-3 to Houston on Sunday and is 1-4 in its last five, a stretch that includes 8-1 and 8-2 losses to Milwaukee. Junior Caminero leads the Rays with 37 home runs and 87 RBI, and Chandler Simpson is hitting .309. Juan Soto (22 home runs) and Bo Bichette (66 RBI) lead a New York lineup that has scored more than three runs once in its last five games.
What the Mets vs Rays Board Is Pricing
The moneyline reads Tampa Bay 61c and New York 40c, and it reads that on both venues: 61c on Kalshi and 61c on Polymarket for the Rays, 40c and 40c for the Mets. There is no cross-platform gap to work in the winner market, which is unusual on a low-liquidity interleague game and a sign the two books are looking at the same pitching matchup. The two sides sum to 101c, standard two-sided pricing. ESPN's matchup predictor has Tampa Bay at 70.7%, roughly 10 points above the board's implied number, so the market is the more conservative of the two estimates.
The derivative markets say the same thing more precisely. The Rays run line at -1.5 trades at 42c and carries $4.0K in lifetime volume, the second-busiest line on the board. The Mets run line at -1.5 sits at 28.5c (29c Kalshi, 28c Polymarket). The total is centered low: over 7.5 runs at 53c (54c Kalshi, 52c Polymarket), over 8.5 at 45c, over 9.5 at 35.5c. That triangulates to a market expectation right around eight runs, consistent with a Rays pitching staff at home and a Mets offense in a four-game slump. A run in the first inning trades at 49c. Polymarket's three-way after-five-innings board has Tampa Bay 53c, New York 33c, and a tie at 16c.
Line movement is a short story here because the board is young. Across 13 snapshots captured between roughly 8:10 PM and 10:20 PM ET on August 30, 2026, the moneyline never moved off 61c and 40c on either venue. The Rays run line ticked from 41c to 42c in that same window and touched 43c. Polymarket's over 7.5 moved up from 53c to 54c, converging on Kalshi's flat 54c. That is the full extent of the captured series, so it describes Sunday evening and nothing earlier.
The props carry more money than the game itself in one case. Francisco Lindor to hit 1+ home runs at 16c has taken $10.3K in lifetime volume, five times the Mets moneyline and the largest single line on the entire board. Robert Stock over 3.5 strikeouts (4+ strikeouts) at 46c has drawn $5.6K, which is a direct bet on how long New York lets him work. Juan Soto 1+ home runs trades at 19c, Junior Caminero 1+ home runs at 21c, and Ian Seymour 7+ strikeouts at 44c.
When the Mets vs Rays Market Resolves
The moneyline resolves to the team that wins the game on August 31, 2026 at Tropicana Field, first pitch 6:40 PM ET, broadcast on SNY in New York and Rays.TV locally. The winning team's contract pays $1 per share and the losing team's resolves to $0. Extra innings count toward the final score, so the run line and every total settle on the score at the end of the last completed inning of play. If the game is postponed or suspended and completed on a later date, Kalshi and Polymarket settle on the completed game's official result; a game called before it becomes official voids per each platform's own rules.
Key Mets vs Rays Catalysts
Starting pitching gap: Ian Seymour (9-5, 4.21 ERA, 1.15 WHIP) against Robert Stock (0-3, 7.40 ERA, 1.94 WHIP) is the single largest input on the board.
Rays at home: Tampa Bay is 46-23 at Tropicana Field and enters on a four-game winning streak after sweeping San Diego.
Board versus model: the 61c price implies roughly 60%, about 10 points under ESPN's 70.7% matchup projection.
Mets bullpen load: Stock has averaged just over four innings per start, and New York is without Devin Williams and Cionel Perez from the relief corps.
Low total: over 7.5 runs at 53c and over 9.5 at 35.5c put the market's central expectation near eight runs, which compresses the value in the run line.
Prop concentration: the Lindor 1+ home run line at 16c holds $10.3K of the board's $40.3K in lifetime volume, so a lineup scratch moves more money than the moneyline does.
Related Mets vs Rays Markets
The Rays board that closed the weekend sweep is the Padres vs Rays game from August 29, 2026, and New York's most recent page is the Astros vs Mets game from August 30, 2026. For the rest of each club's season, the Tampa Bay Rays hub and the New York Mets hub collect every live game and futures line in one place. The full slate of cross-platform baseball boards sits on the MLB hub.
Resolution Criteria
The moneyline resolves to the team that wins the game played at Tropicana Field in St. Petersburg on August 31, 2026, with a scheduled first pitch of 6:40 PM ET. Each winning team contract pays $1 per share and the losing side resolves to $0. The run line (Tampa Bay -1.5, New York -1.5) and every total, team total, and first-five-innings market settle on the official final score including extra innings. Kalshi and Polymarket both settle from the official MLB result once the game goes final. If the game is postponed or suspended, both venues settle on the completed game whenever it is finished; a contest called before reaching official status is voided under each platform's own rules.
Key Factors
- Ian Seymour (9-5, 4.21 ERA, 1.15 WHIP, 128 strikeouts) starts for Tampa Bay against Robert Stock (0-3, 7.40 ERA, 1.94 WHIP over five starts)
- Tampa Bay is 46-23 at home and has won four straight after sweeping San Diego 9-4, 7-6, and 5-4 in 11 innings
- The 61c board price implies roughly 60%, about 10 points below ESPN's 70.7% matchup projection
- New York is without Devin Williams and Cionel Perez from the bullpen behind a starter averaging just over four innings per outing
- The total is centered near eight runs, with over 7.5 at 53c and over 9.5 at 35.5c
- Francisco Lindor 1+ home runs at 16c carries $10.3K, the largest single line on a board with $40.3K in lifetime volume
What are the current Mets vs Rays odds?
As of the evening of August 30, 2026, Tampa Bay is the favorite at 61c and New York trades at 40c. Both Kalshi and Polymarket price the Rays at 61c and the Mets at 40c, so there is no cross-platform gap on the moneyline.
Who is favored in the Mets vs Rays game and by how much?
Tampa Bay is favored. The 61c price implies roughly 60%, which is about 10 points below ESPN's matchup predictor at 70.7%. The Rays are 82-54 overall and 46-23 at home; the Mets are 61-76 and 29-37 on the road.
Where can I trade the Mets vs Rays market?
Both Kalshi and Polymarket list this game. Kalshi carries it under the KXMLBGAME series along with run line, total, team total, and player prop markets, while Polymarket lists the moneyline, the total, and a three-way after-five-innings market. The board has taken $40.3K in lifetime volume across both venues.
What are the Mets vs Rays run line and total?
Tampa Bay -1.5 trades at 42c and New York -1.5 at 28.5c. The total is centered low: over 7.5 runs at 53c, over 8.5 at 45c, and over 9.5 at 35.5c, which puts the market's central expectation near eight runs.
When does the Mets vs Rays market resolve?
It resolves when the game goes final on August 31, 2026 at Tropicana Field, first pitch 6:40 PM ET. Both platforms settle from the official MLB result, including extra innings, and a postponed game settles when it is completed.
What should I watch before the Mets vs Rays game resolves?
Watch the Mets lineup card and how quickly New York goes to its bullpen behind Robert Stock, who has averaged just over four innings across five starts. Also watch the Lindor 1+ home run line at 16c, which holds $10.3K of the board's volume and reprices instantly on a scratch.