Here are the players who have been gaining and losing fantasy value as Week 1 approaches:
RB Shane Vereen, New England Patriots: More owners are believing in Vereen thanks to a pedestrian preseason from Stevan Ridley. And what's not to like? Vereen figures to be the main cog in one of the NFL's most prolific screen-pass offenses.
RB Knowshon Moreno, Miami Dolphins: Lamar Miller isn't likely to be the answer in Miami. Now that Moreno is two months removed from arthroscopic knee surgery, one solid performance against Dallas is all it took for his stock to skyrocket.
WR Marques Colston, New Orleans Saints: No longer hampered by foot and ankle injuries, Colston turned it on in the second half of last season. Things set up well for him this week.
WR Emmanuel Sanders, Denver Broncos: The realization that Wes Welker is potentially one hit away from extended down time — even before his four-game suspension — has fantasy drafters scrambling for any Peyton Manning target. Sanders is one with big-play ability.
RB Mark Ingram, New Orleans Saints: After a stellar preseason, Ingram may finally be ready to break out. Pierre Thomas has always been a stop-gap measure, and early-season draft darling Khiry Robinson rarely gets mentioned.
RB Maurice Jones-Drew, Oakland Raiders: Jones-Drew was a good value in early drafts as part of a crowded backfield on what projects to be a bottom-half team. Through the preseason, however, the Raiders have shown a commitment to Jones-Drew as their lead horse, and MJD has reciprocated by distancing himself from the pack.
RB Bishop Sankey, Tennessee Titans: There is always an early-season fervor around rookie running backs, and Sankey has the best opportunity of the bunch. However, rookies always have a lot to learn.
WR Sammy Watkins, Buffalo Bills: Like Sankey, Watkins rode the early preseason wave. But with a rib injury, little playing time and an unproven quarterback in E.J. Manuel, Watkins' stock has fizzled as the season has drawn near.
RB Trent Richardson, Indianapolis Colts: A poor preseason performance that matched his poor finish to the 2013 season hasn't exactly been what the fantasy community was hoping to see. A T-Rich lottery ticket is unlikely to hit the jackpot.
QB Andy Dalton, Cincinnati Bengals:The arrival of run-heavy offensive coordinator Hue Jackson could keep Dalton from airing it out. Losing WR Marvin Jones doesn't help.
WR Tavon Austin, St. Louis Rams: The loss of QB Sam Bradford has dinged the entire Rams offense to the point that most want to steer clear of everyone. The only player to benefit from Bradford's absence is backup quarterback Shaun Hill.
QB Cam Newton, Carolina Panthers: Practicing in a flak jacket to protect his broken ribs is not a good sign for a fantasy team's Week 1 starter. And we haven't even addressed a depleted and inexperienced corps of receivers.
— Tony Holm, FantasySharks.com