NFL training camps are open, and for millions of people worldwide their fantasy football preparation has begun in earnest. Here at Sports World News we will break down all 32 NFL teams in terms of their fantasy value. Readers will find the must-own players in every format, the sleepers in specific formats, and hidden gems only necessary for those in very deep leagues.

Today's preview will be on the Buffalo Bills.

Must Own:

C.J. Spiller, RB: Spiller will be underdrafted this year because so many believed in him as a first-round talent in 2013. He rewarded those believers with an injury-marred campaign that produced 933 yards and only two touchdowns on the ground. In the passing game he amassed just 33 catches for 185 yards and zero scores.

The talent is still there though, and as a the consensus No. 17 running back this year he's got tremendous upside.

Fred Jackson, RB: After two years spoiled by injury Jackson stepped up while Spiller nursed various maladies and turned in an awesome season. He almost got to 1,000 yards and scored nine touchdowns, blowing past his previous career-high. His production will dip in 2014 with Spiller resuming his duties as the primary back, but Spiller's injuries last year can't be discounted.

Even if Spiller's healthy, Jackson will get his touches and may be the preferred option at the goal line.

Sammy Watkins, WR:

Watkins posted video game numbers at Clemson last year, but will be largely over drafted because of them. He's obviously a talented wide receiver, but rookies generally aren't huge contributors at wide receiver, and his quarterback, EJ Manuel, isn't polished.

Watkins will get the most targets on the team in all likelihood, but this offense will run more than it throws. If Watkins is a FLEX option or No. 3 wide receiver he will be fine-if he's being counted on for more be prepared to make some trades.

Sleepers (Best Format):

Mike Williams, WR (Standard): In the first three years of his career Williams has been a 60-65 catch type of guy, so in PPR formats he doesn't grab your attention. Scan over to the touchdown column, however, and he posted 11 scores and nine in his first and third seasons. At 6-foot-2, 204 lbs. Williams is a big target with good hands; in other words he's a perfect red zone target. Snap him up late and plug him in during bye weeks or against weak pass defenses. He may steal you a week.

Bryce Brown, RB (Standard): Brown's never gotten a chance to shine on his own, and that seems to still be the case in Buffalo. He's buried as the No. 3 back right now, and without injuries he'll likely stay put. If one of Spiller or Jackson goes down though, he'll be in line for steady touches.

Brown is capable of big plays-he has 65-yard runs in each of the last two seasons, and averaged over four yards per carry in both years too. He's someone to take at the very end of your draft if the league is deep.

Deep Finds (Best Format):

Tony Moeaki, TE (Standard): Are you in an extremely deep league? If so, tight end is a total crapshoot. Moeaki most likely won't make an impact in fantasy this year since Scott Chandler's ahead of him on the depth chart, but he's a superior playmaker.

Chandler's good in the red zone, but Moeaki is more versatile and athletic, as evidenced by his 13.7 yards per catch in 2012 with the Chiefs. Last year was ruined by injury, but Moeaki may be a surprising security blanket for Manuel.