Fantasy football leagues have passed the midway point of the regular season, which means everyone is scrambling to find any players who can fill a hole created be injury or ineffectiveness. Heading into Week 1, Zac Stacy and Toby Gerhart were two guys who had some question marks, but were expected to be solid starting options in a lot of leagues. As we enter Week 8, Denard Robinson and Benny Cunningham have surged past them into fantasy relevance. This kind of thing happens frequently in fantasy football, and yet each year the particular players always catch us off guard.

The biggest running back injury news this week belongs to the Buffalo Bills. In Week 7, C.J. Spiller broke his collarbone and has been placed on injured reserve with a return designation. Earlier in that game, Fred Jackson suffered a groin injury that will cost him at least a couple weeks. That leaves Anthony Dixon and Bryce Brown as the two options in Buffalo. We have both ranked close to each other because this has "running back by committee" written all over it. Dixon got the first look last Sunday, but anything is possible.

Trent Richardson suffered a hamstring injury in Week 7, but it is not considered too serious. Richardson had his best game of the season prior to the injury, but Ahmad Bradshaw is the better running back. Richardson is expected to play in Week 8, but if the Colts play this conservative, it could bode well for Ahmad Bradshaw.

On to our Week 8 rankings.

Running back rankings (Standard), Week 8

(DK: Daniel Kelley; DC: Dan Ciarrocchi; SK: Scott Kaliska; John Daigle has the week off)

Rank Consensus Team Opponent DK DC SK 1 DeMarco Murray DAL WAS 1 1 1 2 Matt Forte CHI @NE 2 2 2 3 Jamaal Charles KAN STL 4 4 4 4 Arian Foster HOU @TEN 5 5 3 5 Le'Veon Bell PIT IND 3 6 6 6 Marshawn Lynch SEA @CAR 8 3 5 7 LeSean McCoy PHI @ARI 6 7 7 8 Andre Ellington ARI PHI 7 8 8 9 Lamar Miller MIA @JAC 13 9 9 10 Giovani Bernard CIN BAL 11 11 11 11 Eddie Lacy GB @NO 9 12 13 12 Ben Tate CLE OAK 18 10 10 13 Jerick McKinnon MIN @TAM 10 15 15 14 Joique Bell DET ATL (London) 17 13 12 15 Ronnie Hillman DEN SD 16 14 14 16 Ahmad Bradshaw IND @PIT 12 16 17 17 Alfred Morris WAS @DAL 14 19 20 18 Justin Forsett BAL @CIN 15 20 19 19 Branden Oliver SD @DEN 19 17 18 20 Shane Vereen NE CHI 21 18 16 21 Chris Ivory NYJ BUF 23 21 21 22 Darren McFadden OAK @CLE 25 24 22 23 Mark Ingram NO GB 27 22 23 24 Reggie Bush DET ATL (London) 24 25 24 25 Doug Martin TAM MIN 26 23 26 26 Denard Robinson JAC MIA 22 28 28 27 Tre Mason STL @KAN 29 26 25 28 Bishop Sankey TEN HOU 33 27 27 29 Trent Richardson IND @PIT 32 29 30 30 Anthony Dixon BUF @NYJ 28 31 34 31 Jeremy Hill CIN BAL 30 32 33 32 Bryce Brown BUF @NYJ 20 -- 29 33 Steven Jackson ATL DET (London) 31 34 36 34 Isaiah Crowell CLE OAK 42 30 31 35 James Starks GB @NO 34 35 35 36 Jonathan Stewart CAR SEA 43 33 32 37 Benny Cunningham STL @KAN 35 39 39 38 Bernard Pierce BAL @CIN 39 37 37 39 Bobby Rainey TAM MIN 37 38 41 40 Chris Johnson NYJ BUF 47 36 38 41 Khiry Robinson NO GB 38 42 45 42 Roy Helu Jr. WAS @DAL 45 43 42 43 Antone Smith ATL DET (London) 36 47 48 44 Travaris Cadet NO GB 50 41 40 45 Jonas Gray NE CHI 41 44 46 46 Matt Asiata MIN @TAM -- 40 43 47 Storm Johnson JAC MIA 48 45 44 48 Brandon Bolden NE CHI 40 -- -- 49 Stepfan Taylor ARI PHI 46 46 50 50 Zac Stacy STL @KAN 44 -- -- -- Knile Davis KAN STL -- 48 47 -- Juwan Thompson DEN SD 49 -- -- -- Terrance West CLE OAK -- 49 -- -- Daniel Thomas MIA @JAC -- -- 49 -- Lorenzo Taliaferro BAL @CIN -- 50 --

Running back rankings (PPR), Week 8

(DK: Daniel Kelley; DC: Dan Ciarrocchi; SK: Scott Kaliska; John Daigle has the week off)