Here are at least three keys to the game for the Green Bay Packers against the Detroit Lions this Sunday in Detroit:<p> Jump on the Lions early:

The Lions were the worst team in football last season, and showed no signs of improvement in getting blasted at Miami during the season opener, and then by the Carolina Panthers in Week 2. The Dolphins ran out to a 21-0 lead just 20 minutes into the game and coasted from there. The Panthers took a similar course. The Lions locker room seems to be breaking down already, with starting middle linebacker Chris Claiborne blaming others for the putrid run defense and coach Marty Mornhinweg calling out wide receiver Bill Schroeder for a lack of guts. If the Packers can show their dominance early, the Lions may crumble. This is the opener for Ford Field, so a quick Packers start will silence a pro-Detroit crowd.

Stop the Lions' running game: If healthy, running back James Stewart gives the Lions a genuine workhorse to move the chains and keep the clock ticking. Stop Stewart, however, and the Packers will force the Lions to move the ball through the air. While quarterback Mike McMahon is exciting, he has yet to prove he can win a game by himself. Make the young quarterback pass and keep him in the pocket, and the Packers' defense could have a field day. Let Stewart run, and the Packers' defense could be put on its collective heals.

Confuse Harrington: The Lions will start rookie quarterback Joey Harrington, the third overall pick of last April's NFL draft, instead of Mike McMahon. Harrington filled in for McMahon during the first two weeks of this season with unimpressive results. he completed just 7 of 18 passes for 52 yards and had one pass intercepted. His passer rating is 23.8. The Packers should be able to mix up looks on defenses to confuse the young but talented quarterback.

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