When it comes to Fantasy Football, there's a big difference between "Should I start this player?" and "Can I trust this player?" And, in looking at my rankings at running back for Week 3, I think the gap truly emerges right at RB18. 

I think you should start Mike Davis. He's the clear lead back in this offense despite the presence of Cordarrelle Patterson, and has been heavily used in the passing game, with 13 targets through two games. You almost certainly have to start Davis this week. But can you trust him? Of course not! He's been awful -- 3.6 yards per carry and 3.7 yards per target with no touchdowns on a team that has looked rudderless. Right now, he's got volume going for him; if that goes away, he's got nothing. 

And you can go on down the list: Clyde Edwards-Helaire, James Robinson, Myles Gaskin, Kenyan Drake … these are all guys you should probably start, but you can't trust any of them. There are probably players below them you can even trust a little more -- Damien Harris has a more guaranteed role than any of those guys -- but they don't have the same kind of upside. 

Running back usually ends up pretty messy, but things look especially bad after just two weeks. Hopefully, we'll get some clarity on those guys this week and we can feel a bit more secure. Right now, it's pretty hard to. 

Week 3 RB Rankings

  1. Christian McCaffrey
  2. Alvin Kamara
  3. Derrick Henry
  4. Joe Mixon
  5. Austin Ekeler
  6. Aaron Jones
  7. David Montgomery
  8. Chris Carson
  9. Saquon Barkley
  10. Jonathan Taylor
  11. Alexander Mattison
  12. D'Andre Swift
  13. Najee Harris
  14. Antonio Gibson
  15. Nick Chubb
  16. Ezekiel Elliott
  17. Mike Davis
  18. James Robinson
  19. Myles Gaskin
  20. Kenyan Drake
  21. Clyde Edwards-Helaire
  22. Kareem Hunt
  23. Miles Sanders
  24. Chase Edmonds
  25. Leonard Fournette
  26. Devin Singletary
  27. Ty'Son Williams
  28. Melvin Gordon
  29. Jamaal Williams
  30. Trey Sermon
  31. Damien Harris
  32. Michael Carter
  33. James White
  34. Sony Michel
  35. Javonte Williams
  36. Tony Pollard
  37. Nyheim Hines
  38. David Johnson
  39. Ty Johnson
  40. Mark Ingram
  41. Peyton Barber
  42. J.D. McKissic
  43. Cordarrelle Patterson
  44. Latavius Murray
  45. Kenneth Gainwell
  46. James Conner
  47. Ronald Jones
  48. Salvon Ahmed
  49. Giovani Bernard
  50. Phillip Lindsay
  51. Carlos Hyde
  52. AJ Dillon
  53. Tony Jones
  54. Jeremy McNichols
  55. Larry Rountree
  56. Jake Funk
  57. Zack Moss
  58. Darrel Williams
  59. Damien Williams
  60. Malcolm Brown

So who should you start and sit this week? And which surprising quarterback could lead you to victory? Visit SportsLine now to get Week 3 rankings for every position, plus see which QB is going to come out of nowhere to crack the top 10, all from the model that has out-performed experts big-time.