Seahawks vs Cardinals Prediction & Odds (Sep 20)

A Backup Quarterback and a Road Favorite

Sam Darnold is listed Out for Seattle, and the market still prices the Seahawks at roughly 65 percent to win this game on the road. That is the tension in Seahawks vs Cardinals. Arizona is home, Arizona is 1-0, Arizona just watched Jacoby Brissett complete 27 of 37 passes, and the number still says the visitors are the better team by four points. Somebody is wrong, and the price tells you who the market thinks it is.

The Matchup

Kickoff is Sunday, September 20, 2026 at 4:25 PM ET at State Farm Stadium, Week 2 of the regular season. Both clubs are 1-0 as of publication. Seattle sits third in the NFC West, Arizona second. There is no prior meeting this season to lean on, so we are working off one game of evidence apiece and a market that has already made up its mind. Cardinals vs Seahawks division games tend to be tight and low-scoring, and the posted total of 41.5 points reflects exactly that expectation.

Players to Watch

Brissett is the Arizona Cardinals passing leader with 27 completions on 37 attempts for 277 yards and a touchdown. That is high volume and high accuracy, a quarterback who moved the chains without chasing explosive plays. For the Seattle Seahawks, Drew Lock leads the way at 16 of 22 for 187 yards and a touchdown, an efficient, smaller sample. With Darnold listed Out, that Lock line is the freshest quarterback data Seattle has on file. Fewer throws, similar efficiency, which usually means a defense and a run game carrying the water.

The Numbers

The moneyline is a straight bet on who wins. Seattle is -186 at ProphetX: a $100 bet profits $53.76 when it wins and loses $100 when it does not, so it needs to win 65 percent of the time just to break even. Arizona is +184 at ProphetX: $100 profits $184.00, with a break-even of 35.2 percent. The spread is a bet on margin. Seattle -4 at +105 (ProphetX) wins only if Seattle wins by 5 or more, pushes (stake returned) on a win by exactly 4, and loses on a 3-point win.

That $100 profits $105.00, break-even 48.8 percent. Arizona +4 at -105 (BetMGM) wins if Arizona wins outright or loses by 3 or fewer, pushes on a 4-point loss, loses by 5. It profits $95.24 on $100, break-even 51.2 percent. The total is a bet on combined points: Over 41.5 at +102 (ProphetX) profits $102.00, break-even 49.5 percent; Under 41.5 at -107 (ProphetX) profits $93.46, break-even 51.7 percent.

Where the Value Is

Strip out the vig (the sportsbook's built-in margin) and the market-implied read is Seattle 65.1 percent, Arizona 34.9 percent, a fair moneyline of about -187. So Seattle at -186 pays slightly more than the market's own read: plus $0.10 per $100 risked. Thin, but positive. Arizona at +184 against a fair +187 is minus $0.88 per $100 risked.

The spread is its own separate market with its own number: the no-vig cover probability here is 50 percent per side, fair price about -100. That makes Seattle -4 at +105 worth plus $2.50 per $100 risked, and Arizona +4 at -105 worth minus $2.38 per $100 risked. Both total sides price out negative, minus $1.22 per $100 on the Over and minus $1.14 per $100 on the Under. Shop it. At -100 instead of +105, this edge is gone.

Injuries

Six names. Seattle has three ruled Out: Sam Darnold, Anthony Bradford and Ty Okada. Arizona lists three as Questionable: Isaac Seumalo, Isaiah Adams and Andrew Billings. Questionable means genuinely uncertain, so we assign it no probability and wait for Sunday's inactives before kickoff. Note the shape, though: Seattle's confirmed losses are at quarterback and on the offensive line, Arizona's uncertainty is on the interior of both lines.

The Pick

Seattle Seahawks -4 at +105, best price at ProphetX. Break-even is 48.8 percent, the no-vig cover number is 50 percent, and that gap is the whole case: plus $2.50 per $100 risked. Win by 5 or more and it cashes.

The Prediction

Seattle's defense travels, Lock is being asked to manage rather than carry, and Brissett's volume day says Arizona needs plenty of snaps to score. We project Seahawks 24, Cardinals 17, which adds to 41 points, one point below the 41.5 total, though neither total side prices well enough for us to play. That is the read on this number, and the Desk posts a documented free play on days like this one right below.