A position-by-position look at the Seahawks’ roster heading into their preseason opener:

Quarterback

• Number kept last season: Three.
• Average number kept since 2002: Three.
• Locks: Matt Hasselbeck, Seneca Wallace.
• On the bubble: David Greene, Gibran Hamdan.
• Longer odds: Travis Lulay.
• Comment: Hasselbeck and Wallace are getting the vast majority of the snaps. Holmgren said he sees “not much to choose from” between Greene and Hamdan, in part because they aren’t getting many chances.

Running back

• Number kept last season: Five.
• Average number kept since 2002: Five.
• Locks: Shaun Alexander, Maurice Morris, Mack Strong (FB).
• Looking safe: Leonard Weaver (FB).
• On the bubble: David Kirtman (FB), Josh Scobey, Marquis Weeks.
• Longer odds: Ran Carthon, Jimmy Dixon.
• Comment: Weeks has come on strong lately. Holmgren challenged Kirtman to improve his study habits. One could make the case that Weaver deserves “lock” status.

Wide receiver

• Number kept last season: Seven.
• Average number kept since 2002: Six.
• Locks: Darrell Jackson, Bobby Engram, Nate Burleson.
• Looking safe: D.J. Hackett, Peter Warrick.
• On the bubble: Ben Obomanu.
• Longer odds: Maurice Mann, Taco Wallace, Skyler Fulton, Tony Brown, Keenan Howry, C.J. Jones.
• Comment: Burleson is wearing down a bit because he’s taking so many reps in practice. Jackson won’t be back from injury until the third exhibition game. Hackett, Wallace and Fulton are sidelined, while Brown made his camp debut only recently.

Tight end

• Number kept last season: Three.
• Average number kept since 2002: Three.
• Locks: Jerramy Stevens, Itula Mili.
• On the bubble: Will Heller.
• Longer odds: Mike Gomez, Matt Murphy, Keith Willis.
• Comment: Heller’s blocking ability and experience make him the safe choice for the third spot at the position. Gomez has a chance because he has caught the ball well, but Seattle already has skilled receivers at the position.

Offensive line

• Number kept last season: Nine.
• Average number kept since 2002: 8.75.
• Locks: Walter Jones, Floyd Womack, Robbie Tobeck, Chris Gray, Sean Locklear, Chris Spencer, Ray Willis, Tom Ashworth, Rob Sims.
• Longer odds: William Henry, Jeff Bolton, Jason Schmidt, Pat Ross.
• Comment: No position on the team features less suspense. The top nine are set and right now it’s tough to see a 10th player emerging.

Defensive line

• Number kept last season: Eight.
• Average number kept since 2002: Nine.
• Locks: Grant Wistrom, Marcus Tubbs, Chuck Darby, Bryce Fisher, Craig Terrill, Rocky Bernard, Darryl Tapp, Russell Davis.
• On the bubble: Joe Tafoya, Chris Cooper, Kemp Rasmussen.
• Longer odds: Robert Pollard, John Syptak, Alex Guerrero.
• Comment: Injuries remain the biggest concern for Seattle at the position. Tubbs, Bernard and Tafoya have yet to practice at camp.

Linebackers

• Number kept last season: Seven.
• Average number kept since 2002: 7.25.
• Locks: Lofa Tatupu, Leroy Hill, Julian Peterson, D.D. Lewis.
• Looking safe: Isaiah Kacyvenski, Niko Koutouvides, Kevin Bentley.
• On the bubble: Cornelius Wortham.
• Longer odds: Lance Laury, Evan Benjamin.
• Comment: The starting three are the strength of the defense.

Cornerbacks

• Number kept last season: Four.
• Average number kept since 2002: 4.5.
• Locks: Marcus Trufant, Kelly Jennings, Kelly Herndon, Jordan Babineaux.
• On the bubble: Jimmy Williams, Reggie Austin.
• Longer odds: Gerard Ross, Lance Frazier, Kevin Hobbs.
• Comment: Williams remains sidelined by injury. Austin might be the fastest player on the roster. He showed toughness, too, by bouncing back from a knee injury faster than expected.

Safeties

• Number kept last season: Four.
• Average number kept since 2002: Four.
• Locks: Michael Boulware, Ken Hamlin, Mike Green.
• On the bubble: Oliver Celestin, Shaunard Harts, Etric Pruitt.
• Longer odds: Brandon Haw.
• Comment: Babineaux is listed at corner, but he provides depth at safety too. That could allow the team to keep one fewer player at the position.

Specialists

• Specialists kept last season: Three.
• Average number kept since 2002: Three.
• Locks: K Josh Brown, LS J.P. Darche.
• Looking safe: P Ryan Plackemeier.
• On the bubble: P Gabe Lindstrom.
• Longer odds: K Ryan Killeen.
• Comment: The exhibition season will determine whether Plackemeier or Lindstrom emerges with Tom Rouen’s old job. Plackemeier is eight years younger and that works to his advantage.