Best, worst matchups at all fantasy football positions for Week 17

Does Mariota's injury affect Henry in Week 17? (1:10)

Mike Clay wouldn't be surprised if the Titans' formula for success against the Colts includes a large dose of Derrick Henry. (1:10)

Matchups are often a driving force behind fantasy managers' weekly lineup decisions. When choosing between two (or more) similarly talented players, you know the first question that comes to mind: Which one has the best matchup?

Ah, but what, exactly, constitutes a favorable or unfavorable matchup?

That's where the "Matchups Map" comes in. Each week, I'll provide a schedule-independent method to determine strength of positional matchups, using the most recent, relevant data. Check back for updated numbers each week, including matchups highlights at each position -- both favorable and unfavorable -- based upon those statistics.

For these purposes, we will use PPR (point per reception) scoring, though I have analyzed this data for both PPR and non-PPR and have found that the rankings would scarcely change (if at all). These do, therefore, help in either scoring format.

The maps include two measures: The first, "Rk," is my personal ranking of how favorable/unfavorable I consider that positional matchup; the second, "Adj. FPA," reflects how far above or below a player's average that defense held opponents at that position. All data is from the past five weeks' NFL action.

Finally, a caveat: Matchups are only one ingredient in my rankings formula. Not every favorable matchup should be exploited; not every unfavorable matchup should be avoided. To get the most complete recipe for whom to start and sit, consult my weekly rankings.