Posted by ESPN.com's Ted Miller
Only Oregon State and USC are replacing both defensive ends. Both, however, have strong traditions at the position, and the Trojans Everson Griffen has started five games and has recorded 11.5 career sacks. California, Arizona and Washington have both starters back. UCLA also does, but Reginald Stokes is out with a knee injury; he may have lost his starting job in any event.
Lots of good players and NFL draft picks here. The competition for first-team All-Pac-10 honors will be intense this fall.
California: The Bears welcome back both starters from their 3-4 defense, Tyson Alualu and Cameron Jordan, and both have All-Pac-10 potential.
Arizona: Juniors Brooks Reed and Ricky Elmore combined for 15 sacks last year and both backups, D'Aundre Reed -- who started four games and had 2.5 sacks in 2008 -- and Apaiata Tuihalamaka are back.
USC: Yeah, yeah, the Trojans must replace both starting ends. Yeah, yeah, Armond Armstead got hurt. But the ends have been outstanding in practices, with Griffen looking poised for a breakout and Wes Horton, Malik Jackson and Nick Perry also ready for star turns.
UCLA: Senior Korey Bosworth had 7.5 sacks and 11 tackles for loss in 2008, while sophomore Datone Jones looks like a budding star.
Stanford: Tom Keiser had six sacks last year and earned freshman All-American honors while Erik Lorig has started 20 career games. Tom McAndrew provides experienced depth.
Oregon: Will Tukuafu had 7.5 sacks and 17.5 tackles for loss last year. Kenny Rowe has looked good in camp
Arizona State: Dexter Davis had 11 sacks and 15 tackles for loss last season. This ranking takes into account that James Brooks has been suspended for three games. Dean DeLeone, a junior college transfer, and sophomore Jamaar Jarrett will step in for Brooks.
Oregon State: Ben Terry and Kevin Frahm have looked good in practice and past performances by unproven Beaver ends through the years are reasons for optimism, but the lack of experience forces an observer to take a wait-and-see attitude.
Washington: Daniel Te'o Nesheim was second-team All-Pac-10 in 2008 after posting eight of the defense's 16 sacks in 2008. Senior Darrion Jones returns at the other end and youngsters Kalani Aldrich and Everrette Thompson have potential.
Washington State: The Cougars only had 16 sacks in 13 games last year. Kevin Kooyman had a good off-season in the weight room, but youngsters and newcomers, such as Travis Long and Casey Hamlett, will need to step up.