Best, worst matchups at all fantasy football positions for Week 5

Players to start and avoid in Week 5 (2:47)

Matthew Berry believes players like Marshawn Lynch and Sammy Watkins that have failed to produce consistently in fantasy so far will continue to do so. (2:47)

Matchups are often a driving force behind fantasy football owners' 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?