In Seattle's first game against Arizona at Qwest Field last month, a 27-3 setback, the Seahawks were 0 of 11 on third down, with many of those coming on third-and-long situations. The Seahawks held the ball for only 17 minutes. The Seahawks are 23rd overall offensively in converting third downs (38 percent), and the Cardinals are second overall in the league defensively in allowing third-down conversions (33 percent).
"It's going to be a challenge," Hasselbeck said. "But the best thing offensively we can do for our team is to win on third down."
The Seahawks also got off to a slow start against Arizona, finding themselves down 17-0 early. Arizona's offense was on the field for long stretches in the first half, including an 80-yard, 11-minute scoring drive to begin the game.
Hasselbeck said the Seahawks would like to get off to a better start on Sunday. "We'd love to start fast," he said. "It's not something we've done this year. But to me, the thing that will probably determine this game for us and them is third downs. They're very good on third down and we've done a nice job on third down the last four weeks, except for the game against them."
Hasselbeck, who was a limited participant in practice on Wednesday, fully participated in practice on Thursday and looked good throwing the ball. Hasselbeck, who suffered a rib injury against San Francisco in the second game of the season, said he feels the best he's felt in awhile.
"Way better than last week," Hasselbeck said. "Way better than the last, five weeks really. So it's the best it's been."
--CB Roy Lewis says he will appeal a $5,000 fine from the league for a late hit. Lewis said he earned the fine for hitting Detroit's Derrick Williams out of bounds at the end of a kickoff return last week. Lewis was penalized with a personal foul.
--LB Lance Laury also was fined $5,000 by the NFL for a late hit on the same play teammate Roy Lewis was dinged by the league.
--WR Mike Hass was added to the team's practice squad after he cleared waivers. The Seahawks released Hass from the active roster this week.
--OTs Sean Locklear and Damion McIntosh split time at left tackle with the first unit on Thursday. McIntosh has started the last two games at left tackle for Seattle, but Locklear has been the team's starting left tackle with Walter Jones on injured reserve (knee), and is expected to be back in his starting role.