Wednesday's National League slate pairs two lopsided matchups: the last-place Giants hosting the fading Reds at Oracle Park, and the majors-best Brewers visiting a Mets club that has quietly slid to 59-72.
Both games carry full Polymarket boards, from moneylines down to home run and strikeout props for the starting pitchers.
Polymarket's newest tool, Combos, lets traders stack several of those contracts into one bundled position instead of trading each line separately.
A Combo works like a parlay: every leg has to land for the trade to pay out, and the platform combines the live prices of each leg into one payout multiple.
There is no partial credit and no early cash out, so a four-leg Combo lives or dies with its weakest leg.
All of that is available right alongside the current Polymarket promo code: ACTION, which allows new users to Deposit $10, Get a $20 Trading Bonus!
4-Leg Polymarket Combo for Giants vs Reds & Mets vs Brewers (Editor's Pick)
We're stacking all four favorites from today's slate into one Combo rather than trading them as separate positions. The legs are:
- Cincinnati Reds moneyline
- Over 7.5 runs in Reds-Giants
- Milwaukee Brewers moneyline
- Over 8.5 runs in Brewers-Mets
The Reds side is priced at 50¢ despite Cincinnati's better record than San Francisco, since Oracle Park's pitcher-friendly dimensions and Landen Roupp's home track record keep the line near a coin flip.
The Brewers leg is the anchor. Milwaukee is 81-50 and sends a Dustin May start against a Mets team playing out a lost season, which is why that contract sits at 59¢, the most lopsided price on the board.
Both totals lean toward the over: Reds-Giants sits at 7.5 with Nick Lodolo carrying a 5.04 ERA into the start, and Brewers-Mets sits at 8.5 with two shaky back-end arms, May and Robert Stock, on the mound.
Polymarket Combo Payout
Multiplying the four individual prices together works out to roughly a 7¢ combined price per share.
Putting $10 into the Combo at that price buys about 130.83 shares, matching the board's listed 13.83x payout on a $10 stake.
Each share is worth $1 only if all four legs resolve in our favor.
- If all four legs hit, the Combo pays out $130.83 on a $10 stake, a profit of $120.83.
- If even one leg misses, whether it's a moneyline upset or a total that lands under, the full $1 stake is lost, since Polymarket Combos settle all-or-nothing.
That's a lot of leverage packed into a $10 ticket, but stacking four independent outcomes means the combined probability of hitting all four is a lot lower than any single leg on its own.
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Giants vs Reds Prediction: Best MLB Player Props Today
The Reds (62-70) are on the road at Oracle Park against a Giants team that has fallen to 53-78 on the year.
San Francisco hands the ball to Landen Roupp, who carries a 7-13 record and 4.34 ERA into his 26th start of the season, while Cincinnati counters with left-hander Nick Lodolo, who has struggled to a 5.04 ERA across 15 starts since returning from a finger injury.
Giants vs Reds Prediction: Moneyline, Spread & Total
The moneyline sits about as close as it gets, with the board splitting the difference almost evenly between the two sides.
Reds (50%, Yes 50¢)
Cincinnati's better overall record is offset by Roupp's home-field track record and Lodolo's rough recent form, which is why this side sits at an even-money 50¢ rather than trading as a favorite.
Giants (51%, Yes 51¢)
San Francisco gets a slight nod as the home team, with Roupp's familiarity at Oracle Park nudging this contract a cent ahead of the Reds side.
The spread and total tell a similar story about a game expected to be tight but not necessarily low-scoring.
- Cincinnati Reds -1.5 (38¢): the market gives the Reds only a 38% chance of covering a run and a half, reflecting how thin the moneyline edge really is.
- San Francisco Giants +1.5 (63¢): the flip side of that same spread, favoring the Giants to at least stay within a run and a half at home.
- Over 7.5 runs (52¢): a near coin-flip total that leans slightly toward scoring, consistent with Lodolo's inflated ERA this year.
- Under 7.5 runs (49¢): Oracle Park's pitcher-friendly reputation keeps this side competitive even with two shaky starters on the mound.
Giants vs Reds Prediction: Top Home Run Props Today
The board lists nine home run contracts for this game, sorted here from highest to lowest Over 0.5 price.
Several of these contracts only have the Over side actively priced, so we're leaving the missing Under sides off the list below rather than showing a placeholder.
- Eugenio Suárez (Home Run Over 0.5: 13¢): Suárez leads this list, and his power-heavy profile in the middle of the Giants order makes him the most plausible bet to leave the yard.
- JJ Bleday (Home Run Over 0.5: 12¢): Bleday's spot in San Francisco's lineup gives him regular reps against a Reds bullpen that's had its issues.
- Rafael Devers (Home Run Over 0.5: 11¢, Under 0.5: 92¢): Devers is one of the few players here with an actively priced Under, reflecting how often he's gone homerless in a given game despite his raw power.
- Sal Stewart (Home Run Over 0.5: 10¢): the rookie infielder rounds out the top tier of Reds bats on this board.
- Elly De La Cruz (Home Run Over 0.5: 9¢, Under 0.5: 99¢): De La Cruz's price looks light for his power ceiling, which could make this an appealing spot if he's seeing quality pitches to drive.
- Tyler Stephenson (Home Run Over 0.5: 9¢): Cincinnati's catcher checks in even with De La Cruz on the board.
- Héctor Rodríguez (Home Run Over 0.5: 8¢): a lower-probability price befitting a hitter without much of a track record yet at this level.
- Jung Hoo Lee (Home Run Over 0.5: 5.3¢, Under 0.5: 99.9¢): Lee's contact-first approach keeps his home run price toward the bottom of the board.
- Drew Gilbert (Home Run Over 0.5: 3.9¢, Under 0.5: 99.9¢): the lightest-priced contract on the list, consistent with a gap-to-gap hitting profile rather than a power one.
Strikeout Props for Landen Roupp & Nick Lodolo
Both starters have multiple strikeout thresholds live on the board.
- Landen Roupp (Strikeouts Over 3.5: 83¢, Under 3.5: 49¢): also tradable at Over 4.5 (71¢) and Over 5.5 (56¢), and the pricing across all three lines points to a market that expects Roupp to clear the strikeout column with room to spare against a Reds lineup that chases.
- Nick Lodolo (Strikeouts Over 2.5: 84¢, Under 2.5: 40¢): also tradable at Over 3.5 (69¢) and Over 4.5 (53¢), with his 26.2% career strikeout rate supporting the shorter lines even amid his rough season overall.
Mets vs Brewers Prediction: Best MLB Player Props Today
Milwaukee (81-50) owns the best record in the National League and travels to Citi Field to face a Mets team that has fallen to 59-72.
Dustin May, who joined the Brewers rotation this year and carries a 6-8 record and 4.57 ERA, opposes Robert Stock, who is 0-2 with a 5.40 ERA for New York.
Mets vs Brewers Prediction: Moneyline, Spread & Total
This is the most lopsided line on today's slate, and the board reflects it clearly.
Brewers (59%, Yes 59¢)
Milwaukee's NL-best record and its edge in starting pitching make this the most confident moneyline price of the day, even on the road.
Mets (42%, Yes 42¢)
New York still gets real value as the home underdog, but a 22-point gap in win percentage between these two clubs shows up directly in this price.
The spread and total both point toward a game Milwaukee is favored to control from the mound as much as the scoreboard.
- Milwaukee Brewers -1.5 (47¢): the market gives the Brewers a coin-flip-plus chance to win by two or more runs.
- New York Mets +1.5 (54¢): the more likely outcome on the spread, with the Mets favored to at least keep the margin inside a run and a half.
- Over 8.5 runs (49¢): a total that leans slightly under, even with two starters carrying ERAs north of 4.50.
- Under 8.5 runs (52¢): the market's mild favorite, suggesting bullpens on both sides are expected to hold up better than the rotations did.
Mets vs Brewers Prediction: Top Home Run Props Today
The board carries 11 home run contracts for this game; we're listing the top 10 by Over 0.5 price and leaving off the lowest-priced contract, A.J. Ewing at 9¢.
Every contract on this list currently has only the Over side actively priced.
- Francisco Lindor (Home Run Over 0.5: 15¢): Lindor's spot atop this list fits his role as the Mets' primary power threat against a Brewers pitching staff that's leaned heavily on its bullpen.
- Jackson Chourio (Home Run Over 0.5: 15¢): Chourio ties Lindor for the top price, reflecting his emergence as Milwaukee's most dangerous everyday bat.
- Jake Bauers (Home Run Over 0.5: 15¢): Bauers rounds out the top tier, a notable price for a player without star billing but clear pull-side power.
- William Contreras (Home Run Over 0.5: 13¢): Contreras's price reflects his consistent middle-of-the-order role for Milwaukee.
- Brice Turang (Home Run Over 0.5: 12¢): Turang has developed more over-the-fence pop this season than his early career suggested.
- Carson Benge (Home Run Over 0.5: 12¢): Benge checks in even with Turang on this board.
- Christian Yelich (Home Run Over 0.5: 12¢): Yelich's veteran presence keeps him priced alongside the rest of this tier despite a lighter recent power output than his peak seasons.
- Jared Young (Home Run Over 0.5: 12¢): Young slots in at the same price as Milwaukee's other middle-of-the-order options.
- Luis Robert Jr. (Home Run Over 0.5: 12¢): Robert's raw power keeps him in this group even during a season that hasn't fully lived up to his ceiling.
- Bo Bichette (Home Run Over 0.5: 10¢): Bichette closes out the top 10, priced as more of a contact hitter than a home run threat in this matchup.
Strikeout Props for Dustin May & Robert Stock
Both starters have thinner strikeout markets than the first game, with several Under sides currently unpriced.
- Dustin May (Strikeouts Over 2.5: 86¢, Under 2.5: 75¢): also tradable at Over 3.5 (71¢), Over 4.5 (52¢), and Over 5.5 (34¢, Under 5.5: 74¢), a spread that reflects real uncertainty about how deep May goes against a Mets lineup he hasn't faced often.
- Robert Stock (Strikeouts Over 2.5: 84¢): also tradable at Over 3.5 (67¢) and Over 4.5 (46¢), pricing that suggests the market expects a shorter outing from New York's starter.
Polymarket Combos vs Parlays: What's the Difference?
"Parlay" is the term sportsbook bettors already know, while "Combo" is Polymarket's own name for the same basic idea on its exchange.
Polymarket rolled out Combos as a beta feature for sports events in August 2026, letting traders bundle several yes-or-no contracts into a single tradeable position rather than building bet slips the way a traditional sportsbook does.
The mechanics are close to a parlay in spirit: Polymarket lets you bundle multiple yes and no contracts into one combined trade that only settles if every outcome you bought into turns out correct.
Where it differs from a sportsbook parlay is in how the price is built. Instead of a bookmaker setting combined odds up front, the Combo builder rolls the live prices of each leg into one combined number that shows the full risk and payout, so the multiplier moves in real time as each leg's market price shifts.
There's also a structural difference worth knowing before trading one. Polymarket's Combos feature is currently limited to specific sports events rather than every market on the platform, and unlike building your own parlay leg by leg, users can't alter or create a new contract inside a pre-packaged Combo.
The payout logic itself is the part that matches a parlay almost exactly. A Combo depends on every event in the bundle resolving in the trader's favor, and the appeal is the chance at a bigger payout than trading each leg separately, with the catch that the whole position falls apart if a single leg misses.
So functionally, a Combo is a parlay. The name change is mostly about fitting the concept into Polymarket's event-contract framework rather than a traditional fixed-odds bet slip.
Giants vs Reds and Mets vs Brewers: Price Analysis
The most notable thing about today's board is how differently the two games are priced relative to the underlying records.
Reds-Giants trades almost dead even despite Cincinnati's clear edge in the standings, a gap the market is closing with Oracle Park's pitcher-friendly reputation and Roupp's home track record.
Brewers-Mets moves the other direction: the price gap between Milwaukee and New York (59¢ to 42¢) roughly matches the real gap in win percentage between an 81-50 club and a 59-72 one.
Anyone stacking these into a Combo is effectively betting that both markets are priced correctly rather than betting against the board, which is a meaningfully different risk profile than chasing a longshot parlay leg. Readers newer to this format can find a fuller walkthrough of contract pricing in Action Network's prediction market apps coverage before placing a live trade.
Use Polymarket Promo Code 'ACTION' to Trade MLB Predictions
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- Read a comprehensive Polymarket review to understand how this exchange operates.
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Disclaimer: Prediction markets provide real-time probability estimates based on traded contracts. These prices reflect market sentiment and do not guarantee future outcomes. Trading event contracts involves risk; ensure you understand the resolution criteria before taking a position.
Giants vs Reds, Mets vs Brewers: Final Thoughts
Today's slate gives Polymarket Combos a fairly clean setup: one near-even game and one heavily lopsided one, stacked together into a single four-leg trade.
The Brewers moneyline is doing most of the heavy lifting on our Editor's Pick, while the two totals add extra variance on top of an already all-or-nothing structure.
For a broader look at how these contracts trade outside of MLB, Action Network's prediction markets hub covers the full range of sports and non-sports events currently live on the platform.
Polymarket Promo Code FAQs
What is the current Polymarket promo code?
The current Polymarket promo code is ACTION, which unlocks a trading bonus for new users who sign up through Action Network's link.
What is the Editor's Pick for today's slate?
The Editor's Pick is a 4-leg Combo covering the Cincinnati Reds moneyline, Over 7.5 runs in Reds-Giants, the Milwaukee Brewers moneyline, and Over 8.5 runs in Brewers-Mets, priced at a 13.83x payout on a $1 stake.
Who is favored in the Giants vs Reds prediction?
The Giants are a very slight favorite at 51¢ to the Reds' 50¢, making this the closest moneyline on today's board.
Who is favored in the Mets vs Brewers prediction?
The Brewers are the clear favorite at 59¢ to the Mets' 42¢, reflecting Milwaukee's NL-best 81-50 record.
What's a notable prop on today's board?
Francisco Lindor, Jackson Chourio, and Jake Bauers share the top home run price on the Brewers-Mets board at 15¢ apiece.
How do Polymarket contracts work?
Each contract trades between 0 and 100 cents based on the market's live implied probability, and a winning Yes contract settles at $1 per share while a losing one settles at $0.
What is a Polymarket Combo?
A Combo bundles several individual contracts into one trade that only pays out if every leg resolves correctly, similar to a sportsbook parlay but priced through Polymarket's live order book.
When does the promo code offer expire?
Promo terms can change, so it's worth confirming the current offer details on Polymarket's signup page before funding an account.
When do these MLB markets resolve?
Game-line and prop contracts resolve once the official final box score is posted for each matchup.
