Ted Miller Every season true freshman make an impact and underclassmen become stars. Who might those guys be in the Pac-12 in 2011? (Note: With "underclassmen to watch," we mostly stayed away from guys who made a significant impact in 2010, such as Arizona State defensive end Junior Onyeali, Colorado receiver Paul Richardson or California receiver Keenan Allen). Underclassmen to watch Jonathan McKnight, CB, So, Arizona: McKnight, younger brother of former USC running back Joe McKnight, might already be the best cover guy in an already good secondary. Davon Coleman, DE, So, Arizona State: The junior college transfer -- a late signing for the 2011 recruiting class -- might already be the Sun Devils' No. 3 defensive end, and ASU needs him to step up after returning starter James Brooks quit the team. David Wilkerson, OLB, RFr., California: While fellow outside linebacker Cecil Whiteside might be more heralded, Wilkerson was listed as a starter on on the post-spring depth chart. Parker Orms, CB, So., Colorado: Orms was the starting nickel back in 2010 before he blew out his knee on the third play of the season-opener against Colorado State. He's now No. 1 at cornerback -- the Buffs more worrisome position -- despite sitting out spring practices. Scott Crichton, DE, RFr., Oregon State: The Beavers have major questions at defensive end -- a traditionally strong position for their defense. While he didn't come from nowhere, it was a bit of a surprise to see Crichton atop the depth chart after spring practices. Dietrich Riley, So, SS, UCLA: By the end of the season Riley and Tony Dye might be widely viewed as the best safety combo in the conference. Heck, they might already be. Dres Anderson, RFr, WR, Utah: Anderson already looks like the Utes' No. 2 option after junior DeVonte Christopher. Josh Shirley, RFr., LB, Washington: Shirley was such a force as a pass-rusher this past spring, they created a position for him: "Rush" linebacker. Rickey Galvin, RFr, RB, Washington State: Galvin broke his arm at Oklahoma State on the first play of his college career, which ended his debut season. He's speedy and shifty and the Cougars really need him to provide a running threat to help out quarterback Jeff Tuel. Impact freshmen Hank Hobson, LB, Arizona: The Wildcats have major depth issues at linebacker. Hobson looks like the most ready-made guy in the incoming class. He might not start, but he's a good bet to be the No. 4 guy behind the starting three. Stefan McClure, CB, California: While many Cal fans are more eager to see 325-pound nose tackle Viliami Moala, the Bears have depth issues at cornerback, and McClure is almost certain to be in the mix. Colt Lyerla, TE, Oregon: While Oregon needs help at receiver, and at least one one of the incoming guys is almost certain to climb into a prime spot in the rotation, we don't know who that will be. We feel pretty good projecting Lyerla as the Ducks' No. 2 tight end behind David Paulson. James Vaughters, ILB, Stanford: The word most often used to describe Vaughters? "Beast." Stanford is solid at linebacker, but this guy is going to play, and and might well end up suggesting a second-coming of Vontaze Burfict by season's end. George Farmer, WR, USC: There might be somebody who doesn't believe Farmer is a budding star but I have yet to speak with him. Even USC super-soph Robert Woods talks about Farmer's freakish skills. Austin Seferian-Jenkins, TE, Washington: Seferian-Jenkins showed this past spring that he's ready for prime time. He's likely to be the Huskies' starting tight end. A runner-up for the Huskies, by the way, is receiver Kasen Williams, but he will join a deep, veteran crew of receivers. Originally posted by ESPN.com - Pac-10 Blog Click here to view the article.