Week 13 Waiver-Wire Pickups: Identifying the Biggest Boom-or-Bust Adds

Fantasy football leagues are in crunch time—time to find that final waiver-wire guy that will catapult you over your college roommate and into the postseason. 

Here are Week 13's biggest boom-or-bust adds. 

Roy Helu, Washington Redskins 

Mike Shanahan is hated by nearly every fantasy owner out there. Rarely does he stick with the same running back from week-to-week. 

But Helu's 108-yard rushing day that was accompanied by 54 yards receiving warrants another start as the team's feature back this week against the Jets.

Even if he struggles against New York's talented and beefy front four, he'll catch a lot of passes.

C.J. Spiller, Buffalo Bills 

Spiller only averaged 2.9 yards per carry on 19 attempts against the Jets on Sunday. However, he showed signs of life in the latter stages of the game and caught three passes for 15 yards. Head coach Chan Gailey has hinted at using Spiller on more outside runs to play to his real strength, which is his speed.

The Titans are allowing 124.1 yards per game on the ground this season.

Could this be Spiller's breakout performance?

Johnny Knox, Chicago Bears 

Knox had a monster game against the Raiders last week, catching four passes for 145 yards and a touchdown although an 81-yard chunk came on a bomb from Caleb Hanie. 

He has been the odd man out for the most part this season, and only has 28 catches in 2011, but he averages 22.2 yards per catch.

Definitely boom-or-bust option.