Matt Ryan, QB (ATL)--Ryan has been tearing it up this preseason and is 27 of 34 for 329 yards and two touchdowns through two games. The Falcons started making the transition to a more pass-happy offense last season, but this year it looks to be kicking on all cylinders. Before the start of preseason Ryan was being drafted around the sixth or seventh round range across mock draft circles, but with his recent performances he has climbed almost two rounds and is starting to come off the draft board before the likes of Tony Romo and Philip Rivers.Doug Martin, RB (TB)--Although the Buccaneers have yet to name Martin their No. 1 running back it appears more-and-more likely he is going to get the nod. With the recent injury to LeGarrette Blount Marin is expected to get the bulk of the carries out of the backfield for the Buccaneers this week against the Patriots. If all goes well expect Martin to solidify his rank in the Buccaneers depth chart and move up even more on draft day.Ryan Williams, RB (ARI)--Williams has looked great thus far this preseason while Beanie Wells’ stock continues to fall. Williams missed the entire 2011 season with a patella tendon injury, but appears to have fully recovered from the injury after showing a great mix of speed and power through his first two preseason games. In his latest game against the Raiders Williams ran for 25 yards on five carries including a 3-yard touchdown run. As of now Williams is considered a mid-to-late round sleeper pick, but if he keeps this up he will end up being a must-draft running back considering his skill set.Stevan Ridley, RB (NE)--It is always hard to gauge the Patriots backfield, but as of now it appears Ridley is the frontrunner to receive the bulk of the carries. Ridley ran for 40 yards on eight carries in the Patriots first preseason game, but suffered a right leg injury. The injury does not appear to be serious although it has yet to be determined if he will play against the Eagles on Monday night. If Ridley stays healthy expect him to continue to climb up the ADP charts.Rashad Jennings, RB (JAC)--Maurice Jones-Drew is still a no-show in Jacksonville as he sits out waiting for a new contract, but in his absence Jennings continues to fill-in nicely for last year’s leading rusher. Through the Jaguars first two preseason games Jennings has rushed for 118 yards on 18 carries, which gives him 5.1 yards per carry. As the days pass without MJD it only means the higher Jennings will move up draft boards. If you are someone targeting MJD as a value pick, be sure to draft Jennings earlier than later as he continues to be a bright spot for the Jaguars.Donald Brown, RB (IND)--Brown has failed to live up to the expectations set for him the last few seasons, but this preseason he looks like a more inspired player as he battles for the No. 1 spot with  Delone Carter. On Sunday against the tough Steelers defense Brown rushed for 30 yards on six carries including a 1-yard touchdown run.  With another solid performance Brown will likely move into the top 25 amongst fantasy running backs, which could still give owners value in the mid-rounds on draft day.Julio Jones, WR (ATL)--Like Matt Ryan, Jones looks great this preseason and because of his production he continues to move up the ADP charts. Through the first two exhibition games Jones has nine receptions for 150 yards and a touchdown which makes him one of the most productive receivers this preseason. In some fantasy circles Jones ranks in the top 5 amongst wide receivers, but a more realistic expectation would have him in the top 10. If you were planning on drafting him after the third round that will likely not happen after his great performances, so any value he had is now long gone.Greg Little, WR (CLE)--The Browns offense isn’t one many fantasy owners are spending too much time examining, but in their last preseason game it appears Brandon Weeden likes Little’s ability to get open downfield. Weeden connected with Little four times for 45 yards against the Packers after failing to hookup one week prior. Little should not be considered anything more than WR No. 3 to start the season, but if he continues to build his chemistry with Weeden he could become a low-end WR No. 2 that can go off the board in the mid-rounds on draft day. Matthew Beck is a Fantasy Sports Columnist for Rotoinfo.com. If you have any questions or comments feel free to e-mail him at matthewbeck@rotoinfo.com.  Also follow him on Twitter @MatthewRBeck for up-to-date Q&A and fantasy information.