Ben Roethlisberger, QB, Pittsburgh Steelers - This pick isn't about ability or form - it's purely based on matchup. The Steelers and Big Ben will go up against the Jaguars' abysmal pass defense this week, in a matchup that likely won't be very close for very long. Roethlisberger will have further motivation to punish the Jaguars this week on the back of a humiliating loss last week to the lowly Buccaneers. Unless you're flaunting someone like Peyton Manning or Drew Brees this week at quarterback, Ben Roethlisberger should be in your starting lineup.
Zac Stacy, RB, St. Louis Rams - The Eagles rush defense has been very poor so far this year, so you would expect that Stacy, coming off a bye weak, would have a fair amount of success. It also doesn't hurt that Stacy has been much more prominent in terms of both touches and fantasy points in his last two games. The Rams may not find themselves ahead for long portions of the game, but do expect them to stick with the run, as it should reap benefits.
Keenan Allen, WR, San Diego Chargers - Before last week's 10 catch, 135 yard performance, Allen looked like he was going to be somewhat of a fantasy bust this year. However, now that he has seemingly been reaffirmed into Philip Rivers' good graces, he probably deserves a spot in your starting lineup too. Additionally, the Chargers go up against the Jets this week, and, while the Jets have one of the best rush defenses in the league, their pass defense has been lacking this year. Keenan Allen should have another big week, and will hopefully had a touchdown to his stat sheet.
Andy Dalton, QB, Cincinnati Bengals - I'm actually one of few people who still thinks the Patriots are a playoff-worthy team, so I don't believe that the Bengals' Sunday night matchup against the Pats will be as easy as everyone expects. The Patriots have a good secondary (at least in terms of personnel) and one of the better linebacker cores in the NFL. Even if they can't stop the run and have trouble getting to the quarterback, with the exception of Chandler Jones, they probably won't give up another huge week like they did against the Chiefs. I still think the Bengals win this game, but It'll likely be more because of their running game and stingy defense than Andy Dalton.
Montee Ball, RB, Denver Broncos - Ball really struggled before the Broncos' bye week against the Seahawks run defense, and he has an even tougher matchup this week against the Cardinals. Additionally, you can expect Peyton Manning to take over this game for the Broncos, which could mean a light workload for Ball, another factor that would indicate that this will be a down week for him.
Eric Decker, WR, New York Jets - Decker has put up decent fantasy numbers so far this year, but his role in the Jets offense as a whole has to have fantasy owners concerned. Decker has not had a single game with more than five catches, and in general hasn't been targeted very often. So far, his fantasy season has been saved by a couple touchdowns, but if the targets continue to go elsewhere, his touchdowns will probably go elsewhere too. Factor in an uneasy starting quarterback situation, and we've got a recipe for a bad fantasy week.