Trey Benson, Cooper Kupp, and 3 Other Underdog Props For Cardinals vs. Seahawks

A few of the best player props on Underdog Fantasy for Thursday night’s matchup between the Seahawks and Cardinals.

Sep 7, 2025; Seattle, Washington, USA; Seattle Seahawks wide receiver Cooper Kupp (10) goes in motion against the San Francisco 49ers during the fourth quarter at Lumen Field. | Joe Nicholson-Imagn Images

Week four’s Thursday night NFL matchup features the Seattle Seahawks and the Arizona Cardinals. Here are five of the best player props for the game.

Kenneth Walker III Under 54.5 Rushing Yards

Sep 21, 2025; Seattle, Washington, USA; Seattle Seahawks running back Kenneth Walker III (9) celebrates his touchdown with wide receiver Jaxon Smith-Njigba (11) during the second quarter against the New Orleans Saints at Lumen Field. | Steven Bisig-Imagn Images

The Seattle Seahawks running back Kenneth Walker III has put together back-to-back great fantasy performances. However, against Arizona, it appears he will struggle in the run game, making his 54.5 rushing yard prop a strong play.

Arizona currently has allowed the fourth fewest rushing yards per game, allowing just 76.3 rushing yards per contest.  On top of this, the Seahawks' RB2, Zach Charbonnet, will be back in the picture. He missed week three due to a foot injury, but has been participating in practice this week and is expected to return. Through two games Charbonnet has had a total of 27 carries.

Marvin Harrison Jr. Over 3.5 Receptions

Sep 14, 2025; Glendale, Arizona, USA; Arizona Cardinals wide receiver Marvin Harrison Jr. (18) runs the ball defended by Carolina Panthers linebacker Christian Rozeboom (56) during the third quarter at State Farm Stadium. | Matt Kartozian-Imagn Images

Marvin Harrison Jr. has had a disappointing season so far, especially in terms of his usage. Through three games, he has just 10 receptions. He is simply too good a player to be getting the volume he has had so far, and the Seahawks feel like a spot where he could see an increase in his share.

Through two career games against Seattle, Harrison Jr. has a total of 14 targets. In his latest game, he broke his Thursday night 3.5 reception total, snagging four receptions in the game. Also, to add more validity to taking his over, in 2024, he never had a stretch with three consecutive games with fewer than four receptions. In his last two contest, he has had two and three.

Cooper Kupp Over 3.5 Receptions

Seattle Seahawks wide receiver Cooper Kupp (10) catches a pass during a joint practice with the Green Bay Packers on Thursday, August 21, 2025, at Clarke Hinkle Field in Ashwaubenon, Wis. Tork Mason/USA TODAY NETWORK-Wisconsin | Tork Mason / USA TODAY NETWORK via Imagn Images

Cooper Kupp, after notching two receptions last week, should get back on track against the Cardinals. Going back to the fact that Arizona has one of the best rushing defenses in the NFL so far this season, it should equate to more opportunities for Kupp to get catches. In his career against Arizona in his last 10 games, he has had four or more catches in nine of the 10 games.

Kupp has shown potential in his first year in Seattle to be a big part of the offense. In week two, he had seven receptions for 90 yards. This feels like a spot where he could do something similar, making his over on 3.5 receptions the play.

Trey Benson Over 21.5 Receiving Yards

Sep 7, 2025; New Orleans, Louisiana, USA; Arizona Cardinals running back Trey Benson (33) at Caesars Superdome. | Matthew Hinton-Imagn Images

Trey Benson is now the Arizona Cardinals RB1 after James Conner suffered a season-ending injury. It looks like he is in a great place to hit the over on his 21.5 receiving total.

Through three games, the Seahawks, although they are good at guarding the run, have given up a combined total of 173 receiving yards to opposing RB1s. Benson, in his backup role so far this season, has eight receptions for 45 yards. Benson has big play capability, and all it could take for him to break this total is one catch.

Sam Darnold Over 222.5 Passing Yards

Sep 21, 2025; Seattle, Washington, USA; Seattle Seahawks quarterback Sam Darnold (14) throws the ball during the first quarter against New Orleans Saints at Lumen Field. | Joe Nicholson-Imagn Images

Sam Darnold should have no trouble surpassing his 222.5 passing yard total on Thursday night. Arizona again has an impressive run defense, which should force Darnold to drop back more than he did last week, where he only threw 18 passes in a blowout 44-13 win against the New Orleans Saints. The Cardinals have allowed the third-most passing yards per game in the NFL this season.