KANSAS CITY, Mo. — Seattle's newest player spent the game on the sideline, taking notes. The Seahawks didn't need him the way Matt Hasselbeck picked apart Kansas City's defense.

Hasselbeck threw for 216 yards and two touchdowns with newly signed Edgerrin James watching on the sideline, leading the Seattle Seahawks to a 14-10 win over the Kansas City Chiefs on Saturday night in a game in which the Chiefs lost quarterback Matt Cassel to a leg injury.

James, the NFL's active rushing leader, signed with Seattle on Tuesday, but spent the game in sweats, pen and notepad in hand. Hasselbeck put on a good show for his new teammate, leading the Seahawks on scoring drives to end the first half and open the second.

Kansas City had a woeful night on offense — its only TD came on defense — and lost two starters in the game's first three minutes: Cassel, cornerback Brandon Flowers to a hurt shoulder. Receiver Devard Darling also had to be helped off in the second quarter, favoring his left leg.

Cassel was the biggest blow.

He was injured the first time he dropped back to pass, dragged down from behind by Brandon Mebane after the pocket collapsed. Cassel called timeout, then limped down the tunnel toward the locker room and didn't return.

Signed to a a six-year, $63 million contract in the offseason, Cassel had a so-so first preseason game against Houston, then spent last week's game against Minnesota running for his life because of numerous offensive line breakdowns.

Cassel was supposed to play into the third quarter against the Seahawks, show what he can do more of the playbook available. Now, it's not clear if he'll even be available for next week's preseason finale against St. Louis.

Hasselbeck got off to a rough start, too. His first pass was tipped at the line of scrimmage and picked off by Flowers, who returned it for a 28-yard touchdown for Kansas City's first turnover of the preseason.

Hasselbeck was steady after that, moving the Seahawks into scoring position four times in the first half despite playing behind an offensive line missing two starters. He completed a sweet, Rick Barry-like chest pass to T.J. Houshmandzadeh for a 17-yard gain after bobbling the snap in the second quarter, then hooked up with him again for an 8-yard touchdown pass that tied the game at 7.

Hasselbeck moved the Seahawks quickly down the field to open the second half, hitting John Carlson on a 28-yard touchdown pass to make it 14-7. He was done after that, finishing 19 for 25 in what's likely to be his last significant action before the regular season.

No question Hasselbeck is all the way back from last season's back injury.

The kicking game? It became more murky instead of clearing up.

Olindo Mare and Brandon Coutu went a combined 0-for-4 against the Chiefs, each missing from inside 30 yards and 50 or more.

NOTES: Chiefs S Jarrad Page was expected to play, but didn't suit up. ... Chiefs K Ryan Succop had a 53-yard field-goal attempt carom off the crossbar with 4 seconds left in the first half, but made one from 35 yards in the fourth quarter.