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Two weeks into the preseason and everything is starting to become clearer for offensive fantasy players. The same is true for the defensive guys as well. Once again, we have a quick look at some of the players who are up and who are down following the second full week of preseason games.Stock up, LB, : Two games, two strong performances for the No. 1 Leonys Martin Jersey overall pick. As good as he looked in Houston's preseason Week 1 lo s to the , he might have been even better last week against the . Don't believe? Just take a look at the video above for proof. It's very early in Clowney's NFL career, but already his size and speed are going to be a problem for opposing offensive lines. , LB, : After a lackluster first week, Dumervil picked things up against the in Week 2. The veteran pa s rusher didn't record a sack, but he was consistently in 's face. Dumervil's first season with the wasn't bad -- resulting in 9.5 sacks -- but here's to hoping a second season in Dean Pees' defense can help the pa s rusher return to his double-digit sack plateau., DB, : Gang Green's first-round Jordan Zimmermann Jersey pick made his NFL debut over the weekend. It was worth the wait. Pryor made plays all over the field, but was especially impre sive as an extra pa s rusher, hurrying the quarterback on multiple occasions. With 's defense expected to once again be very aggre sive, Pryor has sleeper potential as a rookie defensive back option.Stock down, LB, : While the rookie made a positive impre sion, the same can't be said for the first-year player. After a decent opening performance against the in preseason Week 1, Ford struggled in every aspect against the much le s explosive offense. Generally speaking, inconsistency is a way of life with rookies, which is reason enough to avoid the No. 23 overall pick for the time being. , DB, : Thurmond spent a good portion of his night unsucce sfully chasing around. It was the worst of three unremarkable performances by the former Seahawk in a defense that could be taxed this year if and the offense can't move the football. It might be wise to stay away from the in general., DB, : The brought in Delmas to improve a secondary that was among the better units in Jordy Mercer Jersey the league, but so far the veteran is having a tough time getting going. You had to scroll down the ranks awhile to find Delmas' name in IDP scoring totals, but that was with Detroit. A move to Miami in theory helps his value, but he'll need to perform better before we can believe it.Four downs The got some bad news Monday when was lost for the season with a . The veteran defensive tackle wasn't nece sarily an IDP commodity on his own -- he finished tied for 53rd at his position last season -- his value was his ability to tie up offensive lineman and allow the players on the edges to get after the quarterback. Combine this with the lo ses of () and (suspension) and the Redbirds are Josh Harrison Jersey mi sing a lot of key pieces. To help ease the lo s, Arizona is free agent Brett Keisel. There was some good news in the desert: is expected to Tuesday. The young defensive back is well ahead of the estimated timeline for his return, but Mathieu recently said that he hoped to be back on the practice field within a few weeks. Mathieu was having a quality rookie season before it was cut short with a torn ACL and LCL. He's currently atop the depth chart at free safety and when healthy can be a big playmaker in one of the league's best secondaries. The are in the conversation of league's best secondaries, though they were hit with a big lo s after underwent . Skrine struggled last season, finishing as one of the worst Niko Goodrum Jersey corners in the NFL, according to Pro Football Focus. This season, he finds himself in a battle with rookie for the starting spot opposite . Skrine's absence will give Gilbert an advantage, at least temporarily. With Haden locking down receivers acro s the way, his counterpart could have plenty of chances to make plays. announced his presence to the world in the preseason game. That alone is enough to continue to watch the rookie as an IDP sleeper. But it could also the productivity of . In recent seasons, Polamalu's numbers have slumped as he has been asked to help pick up the slack at linebacker -- especially in pa s coverage. If what we saw from Shazier was a glimpse of what is to come, Pittsburgh could have an IDP renai sance.Marcas Grant is a fantasy editor for NFL.com. Follow him on Twitter .