Guardians vs Orioles Prediction Market Odds, September 9, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
Guardians | +1 — | O 2.5 — | 0%0% | — |
Orioles | -1 — | U 2.5 — | 100%100% | 100% Kalshi |
| Spread | Total | Moneyline | Best ML | |
|---|---|---|---|---|
Cleveland Guardians | +1 — | O 2.5 — | 0%0% | — |
Baltimore Orioles | -1 — | U 2.5 — | 100%100% | 100% Kalshi |
Cleveland (74-72) and Baltimore (70-76) settle a three-game set at Oriole Park at Camden Yards on Wednesday, September 9, 2026, first pitch 6:35 PM ET, with the series tied 1-1. Foster Griffin (15-4, 3.26 ERA) draws Shane Baz (5-15, 3.91), a starter mismatch on the win-loss line that the moneyline is not paying for: the board above prices this within a single point of an even split on both Kalshi and Polymarket. The run line is where the two clubs separate, and Cleveland is playing for an AL Central race it trails by 2.5 games.
Baltimore won the opener 6-4 on Monday and Cleveland answered 9-5 on Tuesday, so this is the rubber game of a series between two teams playing for opposite things. Cleveland is 74-72 and sits 2.5 games behind the Chicago White Sox (75-68) in the AL Central, the only division race either club is still attached to. Baltimore is 70-76, last in the AL East and 17 games behind Tampa Bay (86-58). The Kalshi ticker for this game (KXMLBGAME-26SEP091835CLEBAL) encodes an 18:35 ET start and ESPN lists the same 6:35 PM ET first pitch, so the clock is corroborated by two independent sources.
Guardians vs Orioles Market Context
The moneyline is the flattest number on the board. Baltimore prices at 51% on Kalshi and 51% on Polymarket, Cleveland at 50% and 50%. The two venues are byte-identical on both legs, which removes the usual cross-platform question: there is no venue disagreement to trade here, and the pair summing to 101 is ordinary two-sided vig rather than a pricing error.
What the market will not do at even money it does on the run line. Cleveland minus 1.5 prices at 38.5% (39% Kalshi, 38% Polymarket) while Baltimore minus 1.5 sits at 34%, and the gap widens at the next rung, where Cleveland minus 2.5 is 29% against Baltimore minus 2.5 at 25.5%. That is a market that treats the two teams as coin-flip likely to win but rates Cleveland roughly four points more likely to win by multiple runs, which is the shape you get when the sides agree on who is better and disagree on how much a single game proves.
The total is set just under eight runs. Over 7.5 is the most-traded rung on the board at 61% on both platforms, carrying about $211 of lifetime Kalshi volume, and Over 8.5 drops to 53% (52% Kalshi, 54% Polymarket). Over 9.5 is 42.5%. The first-five-innings total is priced at 52.5% for Over 4.5, so the market expects most of the scoring in the first half of the game and a light back end.
The whole board carries about $1.8K in lifetime volume across the two platforms, with roughly $1K of that on the Cleveland moneyline leg and $584 on the Baltimore leg. That is a light book. It is a real two-sided market on the moneyline and the primary total, and it should be read as a thin one on everything below that.
On line movement, the board holds nine captures spanning roughly two hours on the evening of September 8, and the moneyline never moved inside that window: Baltimore held 51% and Cleveland held 50% on every capture from both platforms. Over 7.5 runs is the only line that traveled, ticking from 60% to 61% early in the window and then holding. Baltimore minus 1.5 sat at 34% across all five of its captures. Lines outside the moneyline and the primary spread and total are not in snapshot scope on this board, so no movement claim is available for the team totals, the inning props, or the player rungs.
Guardians vs Orioles Pitching Matchup
Foster Griffin takes the ball for Cleveland at 15-4 with a 3.26 ERA, 18th in the league. Shane Baz answers for Baltimore at 5-15 with a 3.91 ERA and a team-leading 145 strikeouts. The win-loss records look like a rout and the ERAs are 0.65 runs apart, which is the honest version of the edge and roughly what the run line is pricing rather than the moneyline.
Baltimore's offense runs through Pete Alonso, who leads the club in batting average (.268), home runs (34), and RBI (97). Gunnar Henderson is listed day-to-day, Luis Robert Jr. is on the 10-day injured list, and Ryan Helsley is on the 60-day. Cleveland is missing pieces of its own: Chase DeLauter, the team's batting average leader at .294, is day-to-day, and Rhys Hoskins is on the 10-day IL. Behind Griffin, the Cleveland staff is the deeper one on paper, with Gavin Williams at 228 strikeouts and Parker Messick carrying a 2.53 ERA.
The splits argue for the flat moneyline more than the starters do. Cleveland is 38-33 on the road and Baltimore is 35-39 at home, so the home-field adjustment that normally pushes a team past even money is doing very little work here. Baltimore has lost four of its last five and Cleveland has won three of its last five.
A prop board exists but it is Kalshi-only and effectively untraded, with roughly $1 of lifetime volume per rung. Baz 4-plus strikeouts lists at 68% and 6-plus at 31%, Griffin 6-plus lists at 52%, and Alonso to hit a home run lists at 21%. Those are listed quotes on an empty book, not a second opinion, and they should be read as inventory rather than as market signal.
When the Guardians vs Orioles Market Resolves
The moneyline resolves to the team that wins the game on Wednesday, September 9, 2026, at Oriole Park at Camden Yards. Contracts on the winning side pay $1 per share and the losing side settles at $0. The run line settles on the final margin (Cleveland minus 1.5 needs a two-run Cleveland win or better) and the totals settle on combined runs scored in the official final, including any extra innings. Both platforms settle after the game is declared final, typically within hours of the last out.
Key Guardians vs Orioles Catalysts
Starter gap versus the flat moneyline: Griffin at 15-4 and a 3.26 ERA against Baz at 5-15 and 3.91, with the board still refusing to move off even money.
The run line, not the moneyline: Cleveland minus 1.5 at 38.5% against Baltimore minus 1.5 at 34% is where the market states a preference.
Chase DeLauter's availability: Cleveland's .294 hitter is day-to-day, and the Cleveland team total is priced above Baltimore's at the 4.5-run rung.
Gunnar Henderson's status: day-to-day for Baltimore alongside Luis Robert Jr. on the 10-day IL, thinning a lineup that already leans on Alonso.
AL Central stakes: Cleveland is 2.5 games behind Chicago with the AL Central market live, while Baltimore is 17 out and playing for nothing.
Thin book: about $1.8K in lifetime volume across both platforms means the moneyline and the primary total carry the liquidity and everything below them does not.
Related Guardians vs Orioles Markets
This is the finale of a three-game set, and the two earlier boards show how the market handled the same two clubs on consecutive days: Tuesday's Guardians vs Orioles board preceded Cleveland's 9-5 win, and Monday's opener preceded Baltimore's 6-4 win. For the full slate of live boards on both clubs, the Cleveland Guardians hub and the Baltimore Orioles hub carry every game and futures market attached to each team, and the MLB hub lists the rest of the day's baseball markets.
Resolution Criteria
Resolves to the team that wins the Cleveland Guardians at Baltimore Orioles game scheduled for Wednesday, September 9, 2026, at 6:35 PM ET at Oriole Park at Camden Yards. Moneyline contracts on the winning team pay $1 per share and the losing team settles at $0. Run line markets settle on the final margin of victory, and total-runs markets settle on combined runs in the official final score, extra innings included. Both Kalshi and Polymarket settle after the game is declared official. If the game is suspended and completed on a later date, settlement follows the completed official result; if it is postponed and rescheduled outside the platform window or canceled outright, contracts void and refund per each platform's rules.
Key Factors
- Foster Griffin (15-4, 3.26 ERA) against Shane Baz (5-15, 3.91) with the moneyline still priced within one point of even
- Run line divergence: Cleveland -1.5 at 38.5% versus Baltimore -1.5 at 34%
- Chase DeLauter day-to-day for Cleveland after leading the club at .294
- Gunnar Henderson day-to-day and Luis Robert Jr. on the 10-day IL for Baltimore
- Cleveland 2.5 games behind Chicago in the AL Central; Baltimore 17 games out in the AL East
- Thin book at roughly $1.8K lifetime volume, with liquidity concentrated on the moneyline and Over 7.5 runs
What are the current Guardians vs Orioles odds?
As of the evening of September 8, 2026, Baltimore is a 51% favorite on both Kalshi and Polymarket and Cleveland prices at 50% on both, the flattest moneyline shape an MLB board produces. The live board above carries the current numbers.
Who is favored in Guardians vs Orioles on September 9, 2026?
Baltimore holds a one-point nominal edge at 51% implied probability, which is inside the vig and not a real preference. The market states its actual lean on the run line, where Cleveland -1.5 prices at 38.5% against Baltimore -1.5 at 34%.
Where can I trade the Guardians vs Orioles market?
Both Kalshi and Polymarket list this game, and the board carries about $1.8K in lifetime volume across the two venues. Kalshi additionally lists team totals, inning props, and starting-pitcher strikeout rungs that Polymarket does not, though those Kalshi-only rungs are effectively untraded.
What is the total for Guardians vs Orioles?
The market is set just under eight runs. Over 7.5 is the most-traded rung at 61% on both platforms with about $211 of lifetime Kalshi volume, Over 8.5 drops to 53%, and the first-five-innings Over 4.5 prices at 52.5%.
When does the Guardians vs Orioles market resolve?
It resolves on the final score of the 6:35 PM ET game on Wednesday, September 9, 2026, at Oriole Park at Camden Yards, with both platforms settling within hours of the last out.
What should I watch before Guardians vs Orioles resolves?
Watch the lineup cards for Chase DeLauter (Cleveland, day-to-day) and Gunnar Henderson (Baltimore, day-to-day), and watch whether the run line holds its 4.5-point spread in Cleveland's favor while the moneyline stays flat. A move on one without the other is the first real information this board has produced.