Detroit Tigers vs Chicago White Sox Prediction Market Odds, September 17, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
â–¶Tigers | +1.5 63%62% | O 1 51% | 46%45% | 46% Kalshi |
â–¶Sox | -1.5 37%38% | U 1 49% | 55%56% | 56% Polymarket |
| Spread | Total | Moneyline | Best ML | |
|---|---|---|---|---|
â–¶Detroit Tigers | +1.5 | O 1 | 46% Kalshi | |
â–¶Chicago White Sox | -1.5 | U 1 | 56% Polymarket |
Chicago is the moneyline favorite for the series opener against Detroit at Rate Field, priced at 56 percent on both Kalshi and Polymarket as of the September 16 evening capture. The Tigers side is 45 percent on Kalshi and 44 percent on Polymarket, so the cheaper Detroit ticket sits on Polymarket by one point. The White Sox are 77-75 and 43-31 at home; the Tigers are 72-80 and 33-44 on the road, and that split is what the price is paying for.
Chicago opens this set at 77-75 and Detroit at 72-80, and the moneyline lines up with that five-game gap: the White Sox are the 56 percent favorite on both books and the Tigers are 44.5 percent on average (45 percent Kalshi, 44 percent Polymarket). Kalshi totals 101 across the two sides and Polymarket totals exactly 100, so the vig here is minimal. First pitch is 7:40 PM ET at Rate Field, with the game on MLB.TV, Tigers.TV and CHSN, and the board carries roughly $5,298 in volume across two platforms.
Tigers vs White Sox Market Context
The home and road splits carry most of this price. Chicago is 43-31 at Rate Field, a .581 clip, and only 34-44 away, so the White Sox are a meaningfully different team at home. Detroit is 39-36 at home and 33-44 on the road, a .429 road mark. A 56 percent home favorite implies Chicago wins a bit better than five times in nine, which is a restrained number given those splits, and the pitching matchup explains the restraint.
Framber Valdez, listed as the Detroit probable starter as of September 16, is 10-10 with a 4.01 ERA per ESPN. Erick Fedde, listed as the Chicago probable starter as of September 16, is 8-9 with a 3.97 ERA. Two starters separated by four hundredths of a run in ERA leave the market with little to lean on beyond venue, which is why neither side is priced far from even.
What the Spread and Total Say
The full-game run line is quoted on both books. Chicago at -1.5 is 37.5 percent (37 percent Kalshi, 38 percent Polymarket) and Detroit at -1.5 is 34.5 percent (35 percent Kalshi, 34 percent Polymarket). The distance between the White Sox moneyline at 56 percent and their -1.5 line at 37.5 percent says the market gives roughly a one-in-five chance that Chicago wins by exactly one run. At -2.5, Chicago is 28 percent on both books and Detroit is 25 percent on average.
On the game total, over 7.5 is 56.5 percent, over 8.5 is 49.5 percent (50 percent Kalshi, 49 percent Polymarket) and over 9.5 is 39 percent on both books, which centers the expected score right at 8.5 runs. The first five innings agree: over 4.5 through five is 51 percent on both books, with over 5.5 at 39 percent. Kalshi prices a run in the first inning at 49 percent, and Polymarket has Chicago leading after five at 43 percent, Detroit at 42 percent and a tie at 14 percent, a near coin flip on the early game.
On movement, the captures on this board run from about 8:00 PM to 10:20 PM ET on September 16, so every claim here is scoped to that window. The Kalshi Tigers contract slipped from 46 percent to 45 percent between 8:37 PM and 10:22 PM ET, while Polymarket held Detroit at 44 percent across its captures from 8:22 PM to 9:22 PM ET. The White Sox side held at 56 percent on both books in every capture. The Polymarket Chicago -1.5 line moved between 36 and 38 percent from 8:07 PM to 8:52 PM ET and finished at the top of that range. Lines without snapshots on this board are uncaptured, not flat.
When the Tigers vs White Sox Market Resolves
The moneyline resolves to the winner of the September 17, 2026 game at Rate Field, settled on Kalshi and Polymarket once the game is official and final. Run line and total contracts settle on the final score including extra innings, and the first-five-innings markets settle on the score after five completed innings.
Key Tigers vs White Sox Catalysts
Pitching matchup: Valdez (10-10, 4.01 ERA) against Fedde (8-9, 3.97 ERA), both listed as probables as of September 16, is close to even on paper and keeps the moneyline near the middle.
The home split: Chicago is 43-31 at Rate Field and 34-44 on the road, the single number doing the most work behind a 56 percent White Sox price.
Detroit on the road: the Tigers are 33-44 away from home, a .429 mark, against 39-36 at home.
Cross-platform value: the Detroit contract is one point cheaper on Polymarket (44 percent) than on Kalshi (45 percent); the Chicago side is identical on both books.
A total pinned at 8.5: over 8.5 sits at 49.5 percent with over 4.5 through five innings at 51 percent, so both books see a middle-of-the-road run environment.
Related MLB Markets
For season-long context, the Chicago White Sox team hub and the Detroit Tigers team hub track every market on each club, and the full slate lives on the MLB league hub and today's MLB board.
Resolution Criteria
Resolves to the team that wins the Detroit Tigers at Chicago White Sox game scheduled for 7:40 PM ET on September 17, 2026 at Rate Field. Each winning team contract pays $1 per share and the losing side resolves to $0. Run line contracts (-1.5, -2.5 and -3.5) and total contracts (over 7.5, 8.5, 9.5 and the other listed rungs) settle on the final score including extra innings, team total contracts settle on each club's final run count, and the first-five-innings and first-inning markets settle on the score after the relevant completed innings. Kalshi and Polymarket settle once the game is official and final on the scheduled date. If the game is postponed, suspended or shortened before it becomes an official game, each platform applies its own postponement and void rules, which generally push settlement to the completion date or cancel the contract.
Key Factors
- Probable starters: Framber Valdez (10-10, 4.01 ERA) for Detroit against Erick Fedde (8-9, 3.97 ERA) for Chicago, both listed as of September 16
- Chicago is 43-31 at Rate Field, the number doing the most work behind a 56 percent White Sox price
- Detroit is 33-44 on the road and 72-80 overall entering the series opener
- The Tigers contract is one point cheaper on Polymarket (44 percent) than Kalshi (45 percent); the White Sox side is 56 percent on both
- Over 8.5 runs trades at 49.5 percent, putting the expected total right at 8.5
- Kalshi Tigers price slipped from 46 to 45 percent across the September 16 evening captures while the White Sox held at 56
What are the current Tigers vs White Sox odds?
As of the September 16, 2026 evening capture, Chicago is the favorite at 56 percent on both Kalshi and Polymarket, and Detroit is at 44.5 percent (45 percent on Kalshi, 44 percent on Polymarket). The live board above carries the current prices.
Where does this game trade?
The moneyline, full-game run line, game total and first-five-innings totals trade on both Kalshi and Polymarket, and this page compares them side by side. Team totals, the first-inning run market and the higher and lower total rungs are quoted on Kalshi only, while the score-after-five-innings market is on Polymarket.
Who is favored and by what implied probability?
The Chicago White Sox are favored at an implied 56 percent at home. They are 43-31 at Rate Field, while the Detroit Tigers are 33-44 on the road.
When does the Tigers vs White Sox market resolve?
First pitch is 7:40 PM ET on Thursday, September 17, 2026 at Rate Field. Contracts settle on Kalshi and Polymarket once the game is official and final, usually within a few hours of the last out.
What are the spread and total?
Chicago at -1.5 prices at 37.5 percent and Detroit at -1.5 at 34.5 percent. On totals, over 7.5 is 56.5 percent, over 8.5 is 49.5 percent and over 9.5 is 39 percent, which centers the expected score at 8.5 runs.