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    NFL Week 2 Prediction Market Recap: The 80-Cent Curse Strikes Twice

    NFL Week 2 delivered five upset wins, including two 80-cent Kalshi favorites falling. Browns over Bucs, Saints over Ravens — prediction markets humbled.

    By PredictionMarkets.usMonday, September 21, 20269 min read
    NFL Week 2 Prediction Market Recap: The 80-Cent Curse Strikes Twice

    Prediction markets had a humbling Sunday in Week 2 of the 2026 NFL season. Five underdog teams defied the odds — including two teams the markets had priced at just 21 and 22 cents a share. When two 80-cent favorites go bust on the same afternoon, the field recalibrates fast.

    Here's how Kalshi, Polymarket, and Novig fared when it mattered most.

    The Two 80-Cent Disasters

    Cleveland Browns 23, Tampa Bay Buccaneers 19

    Kalshi priced Tampa Bay at roughly 80 cents per share to win at home before kickoff. The models agreed — AI composites had the Buccaneers between 70 and 73 percent. Cleveland, sitting at 21 cents, was a throwaway on nearly every prediction market board.

    Then a two-hour weather delay — a severe thunderstorm stopped play with two minutes remaining in regulation — reset the atmosphere entirely. When action resumed, the Buccaneers drove to the Cleveland 20-yard line and needed a touchdown to win. Baker Mayfield's fourth-down pass fell incomplete. Final: Browns 23, Buccaneers 19.

    Traders who held Cleveland contracts through the delay collected a dollar on shares that opened the week near 20 cents.

    New Orleans Saints 24, Baltimore Ravens 17

    The Saints entered at approximately 22 cents. Baltimore was priced at 80 cents — the same confidence level as Tampa Bay, making this the other half of the afternoon's double disaster for heavy favorites.

    Trailing into the fourth quarter, New Orleans scored two unanswered touchdowns. Quarterback Tyler Shough completed 27 of 34 passes for 252 yards, threw a touchdown to Chris Olave, then added a rushing score of his own to seal it. Final: Saints 24, Ravens 17.

    Two 80-cent favorites. Same Sunday. Both wrong. The probability of both losing — if you take Kalshi's prices at face value — was roughly 4 percent.

    More Underdogs Who Delivered

    The upset wave wasn't limited to those two headline results.

    Minnesota Vikings 9, Chicago Bears 3

    Chicago entered as 68-cent favorites at Kalshi. Minnesota came in at 32 cents. The game itself was a defensive slugfest — both offenses were bottled up all afternoon — but the Vikings defense delivered a shutout-quality performance, limiting the Bears to a single field goal. Final: Vikings 9, Bears 3.

    Las Vegas Raiders 26, Los Angeles Chargers 14

    The Chargers were 74-cent favorites. The Raiders — priced at 26 cents — got a huge game from quarterback Kirk Cousins, who threw for 253 yards and three touchdowns, connecting twice with Cody White for scores. Wide receiver Tre Tucker added 119 receiving yards and a touchdown as Las Vegas improved to 2-0. Final: Raiders 26, Chargers 14.

    Cincinnati Bengals 20, Houston Texans 6

    Houston entered as a 60-cent favorite at home. Cincinnati came in at 40 cents. Ja'Marr Chase made a circus touchdown catch in the second quarter, Dexter Lawrence II anchored a dominant defensive effort, and the Bengals held the Texans to two field goals all day. Final: Bengals 20, Texans 6.

    Where the Markets Were Right

    To be fair, the markets nailed the majority of Week 2's results — and got several of the easier calls correct by comfortable margins.

    Buffalo Bills 41, Detroit Lions 31 (Thursday Night)

    The week's opening game set the tone well. Kalshi priced Buffalo at 68 cents. The Bills won by 10, and the "Buffalo by 5 or more" spread contract settled at a dollar. This was Thursday night's cleanest prediction market outcome, and the models were in lockstep with Kalshi.

    Kansas City Chiefs 33, Indianapolis Colts 30 (OT, Sunday Night Football)

    Sunday Night Football provided the week's most dramatic moment. Kalshi had the Chiefs at 74 cents. That number looked well-calibrated through most of the game — until Indianapolis forced overtime. Harrison Butker's 40-yard field goal as the extra period expired sent Kansas City home 2-0. Patrick Mahomes finished with 382 yards, 3 touchdowns, and no interceptions in his second strong game back from injury.

    The market was right directionally, but anyone who thought 74 cents meant a comfortable Chiefs win had a nervous final hour.

    San Francisco 49ers 35, Miami Dolphins 13

    This was the week's most lopsided Kalshi pricing: 90 cents on San Francisco, 11 cents on Miami. The 49ers delivered. Brock Purdy threw for 287 yards with two passing touchdowns and added a rushing score. Christian McCaffrey ran for two more. San Francisco led 35-6 before the Dolphins added a late cosmetic touchdown. The market's high confidence was justified in full.

    Carolina Panthers 34, Atlanta Falcons 3

    Kalshi priced Carolina at 55 cents — essentially a coin flip with a slight Panthers lean. The Falcons were at 45 to 46 cents. The result was not close. Carolina dominated from the opening drive and Atlanta didn't score until the second quarter was long over. Final: 34-3.

    Other markets that hit: New England Patriots 20, Pittsburgh Steelers 3 (Patriots were 69-cent favorites); Seattle Seahawks 31, Arizona Cardinals 7 (Seahawks at 68 cents); Dallas Cowboys 37, Washington Commanders 20 (Cowboys at 66 cents, though Commanders quarterback Jayden Daniels left with an elbow injury).

    Green Bay Packers 20, New York Jets 17 (OT)

    A note on the Packers-Jets game: Green Bay entered as 67-cent favorites and eventually won — but needed overtime to do it. Down 17-7 in the fourth quarter, the Packers scored 13 unanswered points, then won on a 26-yard Trey Smack field goal in extra time. The market was right on direction but missed on the degree of difficulty.

    Platform-by-Platform Odds Comparison

    Multiple platforms were active across the Week 2 slate:

    GameKalshi Odds (Favorite)Result
    Browns at BuccaneersTampa Bay 80%Browns won ❌
    Saints at RavensBaltimore 80%Saints won ❌
    Vikings at BearsChicago 68%Vikings won ❌
    Raiders at ChargersLos Angeles 74%Raiders won ❌
    Bengals at TexansHouston 60%Bengals won ❌
    Lions at BillsBuffalo 68%Bills won ✅
    Colts at ChiefsKansas City 74%Chiefs won (OT) ✅
    Dolphins at 49ersSan Francisco 90%49ers won ✅
    Panthers at FalconsCarolina 55%Panthers won ✅
    Steelers at PatriotsNew England 69%Patriots won ✅
    Seahawks at CardinalsSeattle 68%Seahawks won ✅
    Commanders at CowboysDallas 66%Cowboys won ✅
    Packers at JetsGreen Bay 67%Packers won (OT) ✅

    Odds reflect Kalshi pre-game moneyline prices. Sources: Kalshi NFL Hub, CBS Sports, NFL.com.

    Volume Context: The Biggest NFL Prediction Market Season on Record

    Week 2 arrived on the back of historic Week 1 numbers. During the opening weekend, Kalshi posted consecutive daily volume records — $2.426 billion on Saturday and $2.433 billion on Sunday — as combo contracts and NFL markets drove activity across multiple platforms. DraftKings Predictions reached $139.8 million on Sunday alone, while Crypto.com surpassed $100 million for the first time.

    Kalshi had projected $56.51 billion in NFL prediction market volume for the 2026-27 season — a figure that would have seemed unthinkable two years ago. Week 1 alone saw nearly $5 billion in total weekend volume, with football contracts accounting for roughly $750 million across Saturday and Sunday. Week 2 continued the momentum.

    What Does This Tell Us About Prediction Market Accuracy?

    Week 2 will look rough on paper — five underdog wins is a brutal result for any forecasting model. But context matters.

    If Kalshi priced both Tampa Bay and Baltimore at 80 percent, and both lost, that doesn't automatically mean the market was wrong. It means two 20 percent outcomes happened on the same day. In a 16-game slate, that combination is unlikely but not implausible. The sharper question is whether $0.80 was accurate entering the game, or whether there were structural reasons to doubt those prices.

    The Browns and Buccaneers game is the more defensible miss — a weather delay genuinely scrambled the usual momentum dynamics. The Saints-Ravens result is harder to explain away.

    Across the full Week 2 slate, the market correctly identified the winner in nine of the fifteen Sunday games played before Monday Night Football. That's 60 percent directional accuracy when you include the upset losses — consistent with what you'd expect from liquid markets that are integrating a lot of information but aren't omniscient.

    The markets are better calibrated than a coin flip. They're not seers.

    Week 2 Takeaways for Prediction Market Traders

    A few patterns from the week worth tracking:

    80-cent lines deserve scrutiny. When a team is priced at 80 cents, the market is pricing roughly a four-in-five chance of winning. Two such teams losing in the same window is a meaningful variance event. High-confidence lines aren't guarantees — they're probabilities.

    Defensive games create more variance. The Vikings-Bears 9-3 final and the Browns-Buccaneers low-scoring affair both suggest that when offenses are suppressed, upsets become more common because the margin for a single big play grows.

    Overtime is a market calibration problem. The Chiefs' 74-cent price felt accurate until overtime showed just how close the Colts were. Markets price the regulation outcome well; the path there is messier.

    FAQ

    Which NFL games had the biggest prediction market upsets in Week 2? The two biggest upsets by Kalshi pricing were Cleveland Browns over Tampa Bay Buccaneers (Bucs priced at 80%) and New Orleans Saints over Baltimore Ravens (Ravens priced at 80%). Both favorites lost. Las Vegas Raiders over Los Angeles Chargers (Chargers at 74%) and Minnesota Vikings over Chicago Bears (Bears at 68%) were also significant upsets by implied probability.

    How much volume did Kalshi handle during NFL Week 1? Kalshi posted $2.426 billion on Saturday and $2.433 billion on Sunday during NFL Week 1 weekend — consecutive daily volume records. Football contracts accounted for approximately $750 million of that weekend total. DraftKings Predictions and Crypto.com also hit records during the same weekend.

    Did any of the Week 2 favorites cover correctly? Yes. San Francisco 49ers (priced at 90%), New England Patriots (69%), Seattle Seahawks (68%), Dallas Cowboys (66%), Green Bay Packers (67%), Kansas City Chiefs (74%), and Buffalo Bills (68%) all won. The markets called the direction right in the majority of games — the upset losses were statistically clustered in a single afternoon.

    Which platform had NFL Week 2 prediction markets? Kalshi is the primary regulated CFTC-licensed exchange for NFL event contracts. Polymarket US (operated by QCX LLC) offers sports markets including NFL. Novig, DraftKings Predictions, ProphetX, and Underdog also offered Week 2 markets. CBS Sports cited Kalshi, Polymarket, and ProphetX in their game-by-game prediction market coverage.

    Can US residents trade NFL prediction markets? Yes. Kalshi, Novig, DraftKings Predictions (via Railbird/DKeX exchange), ProphetX, and Polymarket US (via QCX LLC) are all CFTC-regulated venues where US residents can trade NFL event contracts. Polymarket's global platform is not accessible to US users — QCX LLC operates the US-facing sports venue separately.

    Conclusion

    Week 2 was a lesson in variance. Two 80-cent favorites losing on the same Sunday is the kind of result that recalibrates both traders and models heading into Week 3. The market got the majority of games right — and the volume data suggests retail engagement with NFL prediction markets remains near historic highs.

    The question now is how quickly prices correct after a shock week. Week 3 markets open with fresh implied probabilities for every team, informed by what just happened. That's the mechanism prediction markets use to update — not perfectly, but faster than most alternatives.

    For a full view of active NFL prediction market odds and season-long championship markets, visit PredictionMarkets.US .

    Sources

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