The Biggest Fantasy Football Sleepers at Every Position

Dak Prescott, Dallas Cowboys (11.10)In terms of fantasy points, Dak Prescott slipped from QB10 in 2017 to QB12 in 2018, but fantasy managers should feel good about his trajectory going forward.For starters, Prescott will have a full season with wide receiver Amari Cooper; the two connected on 53 of 76 targets for 725 yards and six touchdowns in nine games last year. He's 37 years old, but the two-time All-Pro recorded a combined 132 catches for 1,233 yards and eight touchdowns with Prescott under center in the 2016 and 2017 terms.The Cowboys also added wide receiver Randall Cobb to the pass-catching group—an eight-year veteran with a 69.6 percent catch rate.In addition to Prescott's perimeter weapons, he's been a consistent scorer as a ball-carrier, logging 944 rushing yards for 18 touchdowns in three seasons. He also logged three touchdowns on the ground.For perspective, Trubisky had more rushing yards than Russell Wilson (376) and Marcus Mariota (357), two quarterbacks regarded as dual threats out of the pocket.In Year 2 under head coach Matt Nagy, Trubisky may see growth as a passer because of his familiarity within the offense.The Chicago Bears added two running backs who can catch out of the backfield. Furthermore, during Dirk Koetter's first stint as the Atlanta Falcons' offensive coordinator from 2012 to 2014, his lead ball-carrier averaged fewer than 14 carries per game in each of those seasons.In Koetter's first year as a play-caller in Tampa Bay, running back Doug Martin averaged 18 rush attempts per game, but Charles Sims still registered 1,090 yards from scrimmage. Now with the New Orleans Saints, Murray averaged 11.1 rush attempts and caught 37 passes for 244 yards in two seasons with the NFC North club.The Vikings selected Alexander Mattison in the third round of this year's draft; he'll likely fill Murray's old role as the primary backup. Head coach Jon Gruden liked what he saw in former Los Angeles Chargers wideout Tyrell Williams, per NBCS Bay Area's Scott Bair."Williams has made some big plays at multiple positions, and has [shown] great stamina," Gruden said.When wide receiver Keenan Allen tore his ACL in the first game of the 2016 campaign, Williams led the Chargers in receptions (69) and yards (1,059) and tied for second in touchdowns (seven).Allen has been healthy over the last two years, and the Chargers selected wideout Mike Williams in the first round of the 2017 draft; both cut into Williams' target share. The tight end led the Ravens in receiving yardage (308), averaging 23.7 yards per catch, through the final seven contests.The chemistry between Jackson and Andrews puts the 22-year-old tight end on the sleeper radar going into the season. The offense will rely on Brett Maher to finish drives that stall on the opponent's side of the field.Maher converted on 29 of 36 attempts in his first year with the club, but he split the uprights six of seven times from 50-plus yards and only missed one extra point.Maher finished 10th in fantasy points (138) among kickers, and his arrow points up going into the 2019 season because of the offense.